全部计算器与换算工具

Find the determinant, trace, rank, eigenvalues and inverse of any 2×2 matrix in one step, with an animated transformation.

求正弦波 y = A sin(Bx + C) + D 的振幅、周期、相移和垂直移动。

Calculate the bitwise AND of two integers and see the result in decimal, binary, and hexadecimal.

Calculate the antilogarithm (inverse log) of any value in any base: find b^x, 10^x (antilog₁₀), and e^x (antiln).

计算曲线 y = f(x) 在 x = a 到 x = b 之间的弧长。

Calculate arccos(x) — the inverse cosine of a value — in both degrees and radians. Input must be in [−1, 1].

Calculate arcsin(x) — the inverse sine of any value between −1 and 1 — in both degrees and radians.

Calculate arctan(x) — the inverse tangent of any real number — in degrees and radians, with the complementary arccot.

计算区间 [a,b] 上两函数 f 和 g 之间围成的面积。

使用精确数值积分计算 a 到 b 之间曲线下方的面积。

求任意一组数字的平均值，以及总和、个数、最小值和最大值。

计算函数在两个 x 值 a 和 b 之间的平均变化率（割线斜率）。

利用积分均值定理，求函数在区间 [a,b] 上的平均值。

以精确大整数精度对超大整数进行加、减、乘、除、取模或幂运算。

在固定宽度内将整数向左或向右旋转 k 位。离开一端的位从另一端回绕。

使用位掩码操作在整数中的位置 k 处设置、清除、翻转或测试单个位。

将整数逻辑或算术地向左或向右移动 k 位。以十进制、二进制和十六进制显示移位结果。

Perform bitwise AND, OR, XOR, NAND, NOR, XNOR and NOT on two integers within a 4, 8, 16, 32 or 64-bit register, with binary and hex output.

对两个整数计算按位 AND、OR、XOR、NOT（以及 NAND/NOR/XNOR）。以十进制、二进制和十六进制查看结果。

为两个布尔变量在所选运算符（AND、OR、XOR、NAND、IMPLIES、IFF）下构建真值表。

计算第 n 个卡特兰数，统计平衡括号、二叉树、路径和三角剖分的数量。

为任意起始数生成科拉兹（3n+1）序列，并计算到达 1 的步数。

计算组合数 nCr——从 n 个物品中选择 r 个且顺序无关的方式数。

统计多重集选择：从 n 种类型中可重复选择 r 个，即 C(n+r-1, r)。

Calculate the cosine of any angle in degrees or radians — plus sine, tangent and cotangent, instantly.

Calculate the cosecant (csc) of any angle in degrees or radians. Shows csc(θ) = 1/sin(θ), all six trig functions, and a step-by-step solution.

Calculate cosh(x) — the hyperbolic cosine — plus sinh(x) and tanh(x), with a graph of the characteristic catenary curve.

Calculate the cotangent cot(θ) = cos(θ)/sin(θ) in degrees or radians — with sin, cos, tan and a graph of the cotangent function.

通过加减完整圆周，求任意给定角的正负同终边角。

Calculate volume, total surface area, lateral surface area, space diagonal and face diagonals of a cuboid (rectangular box) from length, width and height.

Calculate the arc length and area of a cycloid arch traced by a rolling circle of radius r. Shows parametric equations and animated curve plot.

Calculate the area, perimeter, circumradius, inradius, and diagonals of a regular decagon (10-sided polygon) from any known measurement.

Convert fractions to decimals (including repeating decimal detection) and decimals to simplified fractions, with step-by-step working.

使用精确原函数计算常见函数从 a 到 b 的定积分。

在角度与弧度之间即时转换，并将结果以 π 的简洁倍数形式显示。

计算任意数各位数字之和，并通过反复求和得到其数字根。

计算函数 f(x,y) 在某点沿指定方向向量的方向导数。

计算欧拉函数 phi(n)：从 1 到 n 中与 n 互质的整数个数。

用这个指数计算器将任意底数升至任意次幂，支持负指数、分数指数和小数指数。

Find the prime factorisation, all divisors, number of divisors and sum of divisors for any positive integer up to 1,000,000.

计算任意非负整数的阶乘 n!，即从 1 到 n 所有整数的乘积。

列出整数的所有因数（除数），计算因数个数、总和，并配对每个因数与其互补因数。

求第 n 个斐波那契数，列出前 n 项数列，并计算累积和。

Expand (ax + b)(cx + d) using the FOIL method with full step-by-step working — First, Outside, Inside, Last — and get the simplified polynomial.

对两个分数进行加、减、乘或除运算，并即时得到化简后的结果及其小数值。

使用欧几里得算法求一组整数的最大公约数 (GCD/HCF) 和最小公倍数 (LCM)。

Find the greatest common divisor of two integers using the Euclidean algorithm, with every step shown.

Find the greatest common factor (GCF) of two or more integers — lists all common factors and simplifies fractions.

求二元函数在某点的梯度向量及其模长。

计算 n 个顶点完全图的边数：无向图为握手数 n(n-1)/2，有向图为 n(n-1)。

求两个等长二进制（或十六进制）字符串的汉明距离：位不同的位置数。

对两个十六进制或二进制数进行加减运算，并同时以十六进制、二进制和十进制显示结果。

计算某值的反正弦、反余弦或反正切，并以度和弧度两种形式给出所求角度。

应用余弦定理，由三角形两边及夹角求第三边，或由三边求角。

使用正弦定理，由已知边角对求三角形的未知边或角。

Find the Least Common Denominator (LCD) of two or three fractions instantly, with step-by-step multipliers and a visual breakdown.

Find the Least Common Multiple (LCM) of two or three integers using the GCD / Euclidean algorithm, with step-by-step working.

通过对两侧数值探测，估计函数在 x 趋近某值时的极限。

计算任意正数以任意底的对数，外加自然对数 (ln) 和常用对数 (log₁₀)。

Validate any credit card, IMEI, or ID number using the Luhn algorithm checksum — with a step-by-step walkthrough.

求函数在区间 [a,b] 上的绝对最大值和最小值。

Calculate the arithmetic, geometric and harmonic mean of any list of numbers — enter values separated by commas.

用中点法则以 n 个矩形近似定积分。

使用快速平方取幂法和大整数，高效计算 (base^exponent) mod m。

求一个数的模乘逆元，即满足 a*x 与 1 同余于 mod m 的 x。

求除法的余数和商，提供截断、向下取整和欧几里得三种取模变体以处理负数。

从初始猜测值出发，用牛顿迭代法求函数的根。

Calculate the bitwise NOR of two integers — NOT(A OR B) — and see the result in decimal, binary, and hexadecimal.

将任意整数拼写为英文，例如 1234 变为 one thousand two hundred thirty-four。

用中心差分法求函数在某点处的导数，无需符号代数运算。

在选定位宽下，并排显示有符号整数的原码、反码和补码表示。

Compute the bitwise OR of two integers in decimal, binary or hex, with a full bit-by-bit breakdown.

计算二进制字的偶校验位和奇校验位，并统计其中的 1 位数，用于错误检测。

在某点处数值计算二元函数 f(x,y) 的偏导数。

生成帕斯卡三角形的任意一行——k = 0 到 n 的二项式系数 C(n,k)。

计算旧值与新值之间的百分比增减，以及绝对差值。

快速计算百分比：Y 的 X%、一个数是另一个数的百分之几，以及百分比变化。

通过将一个数与其真因数之和比较，检验它是完全数、盈数还是亏数。

计算排列数 nPr = n!/(n-r)!——从 n 个元素中有序选取 r 个元素的排列数。

计算允许重复时的排列数：从 n 个符号中有序选取 r 个位置共 n^r 种方案。

Approximate π using Nilakantha, Gregory–Leibniz or Machin series — see convergence, error and correct decimal places for any number of terms.

应用鸽巢原理：求最满箱子中有保证的最小数量，以及迫使达到目标数量所需的物品数。

将极坐标 (r, theta) 转换为直角坐标 (x, y) 并绘制结果点。

计算整数中置位（汉明重量）的数量和位长度，并检查其是否为 2 的幂。

Explore the Potato Paradox: calculate how much weight a batch loses when its water percentage drops slightly.

求 n 元集合幂集中子集的数量：共 2^n 个，另加真子集和非空子集的数量。

将任意整数分解为质因数并显示指数形式，例如 360 = 2^3 x 3^2 x 5。

检验任意整数是否为质数，并使用直到平方根的快速试除法查看其质因数分解。

求解形如 a:b = c:d 的比例中的缺失值，并将任意比率化简为最简形式。

使用模和 atan2 角将直角坐标 (x, y) 转换为极坐标形式 (r, theta)。

计算任意角度的参考角，并以度数或弧度显示其所在象限。

计算函数在区间上的左端点、右端点或中点黎曼和。

由任意两个已知量（直角边、斜边或锐角）求解直角三角形，包含面积和周长。

求一个数的平方根、立方根或任意 n 次方根，包括负数的实奇次方根。

将任意数四舍五入到选定的小数位数，或四舍五入到最接近的 10、100 或 1000，并给出向下取整和向上取整值。

Generate RSA public and private keys from two primes, then encrypt and decrypt an integer message — step by step.

在小数和科学记数法之间相互转换，显示尾数、指数和标准形式。

Calculate sec(θ) — the secant function — in degrees or radians, plus all six trig function values at the same angle.

求函数在某点的二阶导数，并判断该处是向上凹还是向下凹。

计算您输入的两个集合的并集、交集、差集和对称差，并显示元素数量。

用辛普森法则（抛物弧线）近似定积分，实现高精度。

Calculate sin(θ), cos(θ), tan(θ) and cot(θ) for any angle in degrees or radians instantly.

一步求出任意度数或弧度角的正弦、余弦、正切及其倒数。

Calculate sinh(x), cosh(x), tanh(x) and coth(x) for any real x. Verifies the identity cosh²−sinh²=1 and plots the curve.

计算第二类斯特林数 S(n,k)：将 n 件物品划分为 k 个非空子集的方案数。

Count the subsets of a set with n elements: total 2ⁿ subsets, proper subsets, non-empty subsets and C(n,k) subsets of any size k.

计算曲线绕 x 轴从 a 到 b 旋转一周所生成的曲面面积。

Compute singular values, condition number, rank, Frobenius norm and spectral norm of a 2×2 matrix via SVD.

Calculate tan(θ) for any angle in degrees or radians — plus sin, cos, cot, sec and csc, with a plotted tangent curve.

求函数在给定点 x = a 处切线的方程。

Calculate tanh(x) — the hyperbolic tangent — plus sinh(x), cosh(x) and the derivative sech²(x), with the characteristic S-curve plot.

对函数在中心 c 处求 Taylor 多项式并与精确值对比。

Calculate sin, cos, tan, cot, sec and csc for any angle θ in degrees or radians, with quadrant and reference angle.

用梯形法则将积分区间分成 n 个子区间，估算曲线下的面积。

计算第 n 个三角数（1+2+...+n）并查看三角数序列。

Calculate all six trigonometric functions — sin, cos, tan, csc, sec, cot — for any angle in degrees or radians.

在给定角度处对所选三角恒等式的两侧分别求值，数值验证其成立。

在 8、16、32 或 64 位下将有符号十进制数转换为二补码二进制数及反向转换，并显示可表示范围。

获取任意角度在单位圆上的精确 (cos, sin) 坐标，并在圆上绘制该点。

Calculate 2D vector magnitude, dot product, 2D cross product, angle between vectors and resultant sum — with an animated vector diagram.

求曲线绕 x 轴旋转所形成的旋转体体积（圆盘法）。

Calculate A XOR B for any two integers up to 32 bits. Shows the result in decimal, binary and hex with a step-by-step bit breakdown.

通过特征方程求 2×2 矩阵的特征值。输入四个元素，得到实数或复数根。

求解 |ax+b|=c 中的 x，并绘制 y=|ax+b| 与 y=c 的图像以查看交点。

使用点积公式求两向量之间的夹角。输入分量即可获得角度（度数和弧度）。

根据首项和公差求等差数列的第 n 项及其前 n 项之和。

用二项式定理展开 (a+b)^n 并列出每一项的系数。

求 2×2 或 3×3 矩阵的余子式矩阵和伴随矩阵（adjoint）。输入数字行即可同时得到两个矩阵。

将 ax^2+bx+c 改写为顶点式 a(x-h)^2+k 并读出顶点坐标。

用克莱默法则和行列式求解 2×2 或 3×3 线性方程组。输入系数和常数即可。

计算两个三维向量的叉积。分别输入三个分量，得到垂直向量及其模。

求解 ax^3+bx^2+cx+d=0 的所有实数根和复数根，并绘制三次曲线图像。

求变化常数 k 并利用正比例或反比例关系预测新值。

求二次方程的判别式 b^2-4ac，立即查看其实根个数。

使用从勾股定理推导出的距离公式，计算两点 (x₁, y₁) 和 (x₂, y₂) 之间的直线距离。

计算两个等长向量的点（标量）积。用空格或逗号分隔输入各分量。

利用根将 ax^2+bx+c 因式分解为 a(x-r1)(x-r2)，支持实数或复数输出。

复合两个线性函数 f 和 g，并在某点求 (f∘g)(x) 的值。

根据公比计算等比数列的第 n 项、有限和与无穷和。

应用指数定律处理同底数幂：进行乘法、除法或乘方运算并化简。

根据两点求直线方程——斜截式 (y = mx + b)、点斜式和标准式，以及斜率和截距，并附带图像。

计算多个向量的线性组合 c1*v1 + c2*v2 + ...。将向量按行输入并附上对应的标量系数。

即时求解任何形如 ax + b = 0 的一元一次方程的 x。免费的一元一次方程计算器，提供分步解答并处理特殊情况。

求解一元线性不等式 ax+b (</<=/>/>=) c，并在数轴上显示解集区域。

按元素对两个相同大小的矩阵求和。将每个矩阵以空格分隔的数字行形式输入，即刻得到结果矩阵。

计算按数字行输入的 2×2 或 3×3 矩阵的行列式；自动检测矩阵大小。

使用行列式和伴随矩阵求 2×2 或 3×3 矩阵的逆矩阵。输入数字行；矩阵必须非奇异。

使用行列点积规则将两个矩阵相乘。将两个矩阵以数字行形式输入；大小必须兼容。

将方阵提升到整数幂次。将矩阵以数字行形式输入并指定指数，以计算 A 的 n 次幂。

使用高斯消元法求任意矩阵的秩。输入数字行以计算独立行数（非零主元数）。

按元素对一个矩阵减去另一个矩阵。将两个矩阵以数字行形式输入，查看差矩阵及每个步骤。

计算方阵的迹：主对角线元素之和。将矩阵以数字行形式输入。

通过翻转行和列求任意矩阵的转置。输入以空格分隔的数字行，即刻得到 A 的转置矩阵。

求坐标平面上两点 (x₁, y₁) 和 (x₂, y₂) 之间的中点。免费的中点公式计算器，显示 x 和 y 两个坐标。

求经过三个点的抛物线的二次方程 y = ax² + bx + c，以及它的顶点、对称轴和判别式，并附带图像。

求经过某一点、与给定斜率平行和垂直的直线方程，以斜截式表示，并附带图像。

将 (px+q)/((x-r1)(x-r2)) 分解为 A/(x-r1)+B/(x-r2)，适用于不同的线性因子。

计算测量值与实际（真实）值之间的百分比误差。免费的百分比误差计算器，适用于科学实验、化学和物理。

根据一个点和一个斜率，用点斜式 y − y₁ = m(x − x₁) 写出直线方程，然后转换为斜截式和标准式，并附带图像。

用 Horner 法在给定 x 处求解任意多项式 P(x) 的值，并绘制该点附近的曲线。

使用交叉相乘求解比例 a/b = c/x 中的未知数 x。免费的比例和比率求解器，适用于等值分数。

用勾股定理求解直角三角形。从两条直角边求斜边，或从斜边和一条直角边求缺失的直角边。

用求根公式求解 ax² + bx + c = 0——包括实根和复根，以及判别式。

从多项式的常数项和首项系数列出所有可能的有理根。

使用 Gauss-Jordan 消元法将任意矩阵化简为行最简阶梯形。输入数字行以查看 RREF。

将矩阵乘以一个标量。按行输入矩阵和标量值，即可立即缩放每个元素。

计算三个三维向量的标量三重积及其构成的平行六面体的体积。

求两点之间直线的斜率，以及倾斜角和 y 轴截距。免费的斜率与上升量除以水平量计算器，并给出直线方程。

使用综合除法将多项式除以 (x-c)，得到商式和余数。

使用克莱姆法则求解 2x2 二元一次方程组。输入系数即可即时求出 x 和 y，并给出行列式和特殊情况检测。

将向量归一化为长度 1。输入分量，得到指向同一方向的单位向量及其模。

求任意维度向量的模（长度/范数）。输入以空格或逗号分隔的分量，得到 |v|。

将一个向量投影到另一个向量上。输入向量 a 和 b，得到投影向量及 a 在 b 上的标量投影。

Calculate the acreage of a rectangular, triangular or circular plot from its dimensions, with results in acres, sq ft, sq m and hectares.

在度、弧度、百分度、角分、角秒和圈之间转换角度——即时且精确。

在平方米、平方英尺、英亩、公顷、平方英里、平方千米等单位之间转换面积——即时且准确。

Convert atmospheres (atm) to pascal, kPa, bar, psi, mmHg, Torr, inHg and millibar — or convert any pressure unit to atm.

估算数据经 Base64 编码后的大小，包含约 33% 的开销以及可选的换行/数据 URI 填充。

将十进制数转换为紧缩二进制编码十进制（BCD）并反向转换，每个数字编码为独立的 4 位半字节。

Convert any non-negative integer between binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16) instantly.

Convert digital data sizes between bits, bytes, KB, MB, GB, TB and binary KiB, MiB, GiB, TiB — with the decimal vs binary difference explained.

Convert centimeters to inches, feet, meters, millimeters, yards and miles instantly with a full reference table.

Convert an RGB color (0–255 per channel) to HEX, HSL, HSV and CMYK — with a live color preview swatch.

在茶匙、汤匙、液量盎司、杯、品脱、夸脱、毫升和升之间转换烹饪计量单位。

Convert typing speed between characters per second (CPS), words per minute (WPM), CPM, and keystrokes per hour (KPH).

Calculate cubic feet from length, width and height in feet. Instantly converts to cubic yards, cubic inches, cubic meters, liters and US gallons.

Calculate cubic meters from length, width and height in meters. Converts to liters, cubic feet, cubic inches, cubic centimeters and gallons.

使用实时、每日更新的汇率在主要世界货币之间进行转换。

准确地转换字节、KB、MB、GB、TB 以及二进制 KiB、MiB、GiB 单位。

即时在比特每秒、kbit/s、Mbit/s、Gbit/s 以及字节、KB/s、MB/s、GB/s 之间转换数据传输速率。

计算数据集通过链路的实际传输时间，考虑协议/开销效率以获得有效吞吐量。

Convert days to seconds, minutes, hours, weeks, months and years — and back. Uses exact hour/minute/second factors and a 365.25-day average year.

Convert decimetres (dm) to and from millimetres, centimetres, metres, kilometres, inches, feet, yards, and miles.

在 kg/m3、g/cm3、g/ml、kg/L、lb/ft3 和 lb/in3 之间快速准确地转换密度，适用于科学和工程。

根据文件大小和连接速度估算文件的下载时间，并以 hh:mm:ss 格式清晰显示结果。

交换 16/32/64 位十六进制值的字节顺序，在大端序和小端序之间转换。

在焦耳、千焦、卡路里、千卡、瓦时、千瓦时、英热单位、英尺磅和电子伏特之间转换能量。

Convert Fahrenheit to Celsius, Kelvin and Rankine instantly with exact formulas and a visual temperature scale.

Convert feet to meters, inches, centimeters, millimeters, yards, miles, kilometers, and nautical miles instantly with exact values.

在牛顿、千牛顿、达因、磅力、千克力和盎司力之间快速准确地转换力。

即时在赫兹、千赫、兆赫、吉赫、太赫和转每分 (rpm) 之间转换频率。

在 L/100km、千米每升、美制英里每加仑和英制英里每加仑之间准确转换燃油经济性。

Convert US liquid, US dry or Imperial gallons to litres, millilitres, quarts, pints, cups, fluid ounces and cubic units.

Convert any English word or phrase to a gematria number value using Simple (A=1–Z=26), Reverse, or Reduced systems.

在标准二进制和反射格雷码之间转换，相邻值恰好只有一位不同。

Calculate the isopsephy (Greek gematria) value of any Greek word or phrase. Each letter maps to its Milesian numeral: Α=1, Ι=10, Ρ=100, Ω=800 and so on.

在厘米与英尺加英寸之间转换身高。切换方向以进行 cm → ft/in 或 ft/in → cm 转换，并显示米制数值。免费、即时且精确。

将十六进制颜色代码（#RGB 或 #RRGGBB）转换为红、绿、蓝通道值和 CSS rgb() 字符串。

Convert hours to minutes, seconds, milliseconds, days, weeks, months and years instantly. Supports decimal hours (e.g. 1.5 h).

将十进制数分解为 32 位（单精度）和 64 位（双精度）的 IEEE-754 符号位、指数和尾数位。

Convert between imperial (inches, feet, pounds, gallons, °F) and metric units instantly — all four measurement types in one tool.

Convert inches to millimetres, centimetres, metres, feet, yards and miles instantly using exact SI definitions.

Convert kilometres to miles, metres, feet, yards, inches, nautical miles and light-years — or convert any distance to kilometres.

Convert kilopascals (kPa) to pascals, MPa, bar, atm, psi, mmHg, Torr, inHg and mbar — or convert any pressure unit to kPa.

Convert land area between acres, hectares, square meters, square feet, sq km, sq miles, rai, cents and marla instantly.

Convert normal text into leet speak (1337) by substituting letters with numbers and symbols — basic or advanced mode.

在米、千米、英里、英尺、英寸、码等单位之间转换——即时且准确。

按官方不可撤销的固定换算率1欧元 = 1.95583保加利亚列弗，在保加利亚列弗与欧元之间互换（依法规定的舍入方式）。

Convert between litres, cubic centimetres (cc), millilitres and US gallons — plus fl oz and cups in one step.

Convert Mbps to MB/s, KB/s and Gbps, and calculate how long it takes to download or upload any file at your speed.

Convert mils (thousandths of an inch) to micrometers, millimeters, centimeters, meters and inches instantly.

Convert miles to kilometers, meters, feet, yards, nautical miles and centimeters instantly with exact international conversion factors.

Convert millimeters to inches, centimeters, meters, micrometers, feet, yards and miles instantly with exact conversion factors.

Convert inches, feet, yards, centimeters, meters, kilometers or micrometers to millimeters instantly with exact conversion factors.

Convert megapascals (MPa) to psi, bar, kPa, atm, GPa, Torr, mmHg and more — or convert any pressure unit to MPa.

Convert torque between Newton-meters, foot-pounds, inch-pounds, kgf·m and Newton-centimeters instantly.

Convert nanometres to micrometres, millimetres, metres, angstroms and picometres — or convert any of those back to nm.

在二进制、八进制、十进制和十六进制之间转换任意整数。输入一个值，选择它的进制，即可即时查看全部四种表示形式。

Calculate how many sheets of paper and reams to buy for a print job — supports duplex printing and multiple paper sizes.

Convert pounds and ounces to kilograms, grams, stones and total ounces. Enter lb + oz together for a combined weight.

在瓦特、千瓦、兆瓦、马力、公制马力、英热单位每小时和英尺磅每秒之间转换功率。

Convert parts per million (ppm) to ppb, ppt, percent, per mille, mg/kg, mg/L and μg/L — and back from any of those units.

在帕斯卡、千帕、兆帕、巴、psi、大气压、mmHg 和托之间转换压强——快速且准确。

Convert PSI (pounds per square inch) to bar, kPa, MPa, Pa, atm, mmHg, inHg, Torr and psf — or convert any pressure unit back to psi.

将红、绿、蓝值（0-255）转换为 #RRGGBB 十六进制代码以及可直接使用的 CSS rgb() 字符串。

将 RGB 颜色通道转换为 HSL（色相度数、饱和度和亮度百分比），便于颜色调整。

在数字与罗马数字之间双向转换（1–3999），采用标准的减法记数规则。

在 m/s、km/h、mph、节和英尺每秒之间快速准确地转换。

使用精确公式即时转换摄氏度、华氏度、开尔文和兰氏度。

即时在纳秒、微秒、毫秒、秒、分钟、小时、天、周、月和年之间转换时间。

在牛顿米、千牛顿米、磅英尺、磅英寸和千克力米之间准确转换扭矩。

Convert any text to Unicode code points (U+XXXX hex, decimal or binary) and see the UTF-8 byte count, character count and script distribution.

Convert a Unix timestamp (seconds since 1970-01-01 UTC) to a human-readable UTC date and time, and see days, weeks, and years elapsed.

根据码率和时长（可选音频轨道）估算视频文件大小，或反向求解所需码率。

在升、毫升、立方米、美制加仑、夸脱、品脱、杯、液量盎司、汤匙和英制加仑之间转换体积。

检查两个十六进制颜色之间的对比度，以及是否符合 WCAG AA/AAA 对普通文本和大文本的要求。

快速准确地转换千克、克、磅、盎司、英石和吨。

Convert any distance to obscure and unusual units: smoots, cubits, furlongs, hands, fathoms, chains, leagues and light years.

Convert yards to metres, centimetres, feet, inches, miles, furlongs and more using exact 1959 SI definitions.

Project your 401(k) balance from salary, contribution %, employer match and expected return. Includes employer match modelling.

Project your 403(b) retirement balance for teachers, nurses and non-profit employees, including the 15-year catch-up rule.

Project your 529 college savings plan balance from current balance, monthly contributions and expected return.

Calculate the Average Daily Rate (ADR) for a hotel or rental property, plus occupancy rate and RevPAR from total room revenue.

Calculate AFFO, FFO, AFFO per share, and P/AFFO for REITs — the key metrics for evaluating real estate investment trust cash flow.

Calculate Additional Funds Needed (AFN) for financial planning: how much external financing a company must raise to support its projected sales growth.

Calculate your US Adjusted Gross Income (AGI) by subtracting above-the-line deductions from total gross income.

根据贷款金额、利率和期限计算每月还款额、总利息和完整的还清成本，并附带第一年的分期摊还表。

Calculate Average Propensity to Consume (APC) and Average Propensity to Save (APS) from income and spending.

Calculate the true Annual Percentage Rate (APR) of a loan including upfront fees, monthly payment, and total interest cost.

Calculate Annual Percentage Yield (APY) from a nominal interest rate and compounding frequency, including continuous compounding.

Calculate After Repair Value (ARV), net profit and ROI for fix-and-flip real estate. Includes the 70% rule maximum offer price.

Calculate Average Variable Cost (AVC = TVC ÷ Q) and optionally Average Fixed Cost and Average Total Cost from your production figures.

根据你的固定成本、单价和单位变动成本，求出以单位数和收入表示的盈亏平衡点。

2026年保加利亚税后薪资计算器：10%统一所得税、含应保险收入上限的社会保险缴款，结果以列弗和欧元双币种显示（官方固定汇率）。

Calculate CAGR from beginning and ending values over any number of years — the smoothed annual growth rate for investments, revenue or any metric.

Calculate the expected return on an asset using CAPM: risk-free rate plus beta times the market risk premium. Plots the Security Market Line (SML).

根据车价、首付、利率和以月计的贷款期限，算出你的月供、总利息和总成本。

Calculate the maturity value and interest earned on a Certificate of Deposit (CD). Enter the principal, APR, term and compounding frequency to see APY and final balance.

Calculate customer lifetime value (CLTV) from order value, purchase frequency, lifespan and gross margin, plus LTV:CAC ratio and payback period.

Calculate Cost of Goods Sold using beginning inventory, purchases and ending inventory — plus gross profit and gross margin if you enter revenue.

看看你的钱在不同复利频率下如何通过复利增长。

Calculate Cost Per Acquisition (CPA) from total ad spend and conversions, plus ROAS and profit when you add total revenue.

Calculate CPM (cost per 1,000 impressions), total ad cost, or total impressions for any digital advertising campaign.

Calculate Click-Through Rate (CTR) from clicks and impressions. Add ad cost to get CPC and CPM alongside your CTR.

Calculate Customer Acquisition Cost by dividing total sales and marketing spend by the number of new customers acquired in the same period.

Calculate net present value (NPV) by discounting annual cash flows at your required return rate. Includes terminal value and payback period.

Calculate how long it takes to pay off a debt and the total interest you will pay, given balance, interest rate, and monthly payment.

了解以固定每月还款额还清信用卡或贷款余额需要多长时间，以及在此过程中你将支付的总利息。

根据原价和售价求出折扣百分比，并准确显示你节省了多少钱。

Calculate the Debt Service Coverage Ratio (DSCR) from net operating income and annual debt payments — used by lenders to assess loan eligibility.

Calculate your Debt-to-Income ratio (DTI) by entering monthly debt payments and gross income — see how lenders assess your borrowing capacity.

Convert a nominal interest rate to the Effective Annual Rate (EAR) for any compounding frequency — daily, monthly, quarterly, or continuous.

Calculate EBIT (Earnings Before Interest and Taxes) from revenue, COGS and operating expenses — with gross margin and EBIT margin.

Calculate EBT (Earnings Before Tax) from revenue, COGS, operating expenses and interest expense — and find the EBT margin.

Calculate the maturity corpus and Section 80C tax savings for an ELSS investment, for both lump sum and monthly SIP modes.

Calculate your monthly EMI, total interest and see the outstanding balance curve for any loan amount, rate and tenure.

Calculate the Expected Monetary Value of a decision by weighting up to three scenarios by their probabilities and monetary outcomes.

Find the Economic Order Quantity (EOQ) that minimises total inventory cost — ordering cost balanced against annual holding cost.

Estimate your EPF corpus at retirement based on India's EPF contribution rules and the EPFO's 2023-24 interest rate of 8.15 % (editable).

Calculate basic and diluted Earnings Per Share (EPS) from net income, preferred dividends and share counts, plus the P/E ratio.

Calculate FFO, FFO per share, and P/FFO for REITs — the standard NAREIT metric for evaluating real estate investment trust operating performance.

2026年芬兰税后薪资计算器：累进制国家税、市政税、教会税、TyEL养老金及失业保险——精确查看实际到手收入。

Calculate your FIRE number, years to financial independence, and portfolio growth using the 4 % safe withdrawal rule and compound returns.

运用货币时间价值计算资金的终值。按任意利率、期限和复利频率，预测一笔本金加上定期追加投入在复利增长下的结果。

Calculate GDP using the expenditure approach: GDP = C + I + G + (X − M). See each component's share of total output.

Calculate GRP (Gross Rating Points), Cost Per Point (CPP) and Cost Per Thousand (CPM) for any advertising campaign. Enter reach, frequency and spend to plan media budgets.

Calculate the Herfindahl-Hirschman Index (HHI) to measure market concentration — enter up to 10 firm market shares to get the index and DOJ classification.

看看通货膨胀如何抬高未来的金钱成本，并在若干年内侵蚀一笔金额的购买力。

计算含只付利息期的房贷还款 — 期间及期后月供、总费用和剩余债务曲线。支持丹麦realkredit管理费率（bidrag）。

Project IRA balance growth to retirement, compare Traditional (pre-tax) vs Roth (post-tax) after-tax values, based on 2025 contribution limits.

Calculate the Liquidity Coverage Ratio (LCR) per Basel III: HQLA divided by 30-day net cash outflows, with inflow cap applied.

Calculate Loss Given Default (LGD), recovered amount, and Expected Loss (EL) from EAD, recovery rate and probability of default.

Calculate your monthly loan payment, total interest, total cost of credit and APR for any loan amount, rate, term and upfront fee.

为任意贷款金额、利率和期限计算你的每月贷款 EMI、总利息和总还款额。

Calculate the LTV ratio for a mortgage or home loan, your equity percentage, and whether PMI is likely required.

Calculate your 2024 MAGI for Roth IRA contributions and traditional IRA deductibility — enter AGI plus common add-backs.

根据产品成本和加价百分比计算售价，以及单位利润和由此产生的利润率。

根据贷款金额、年利率和以年计的贷款期限，算出你的每月房贷还款额、总利息和总成本。

Calculate the Marginal Propensity to Consume (MPC), Marginal Propensity to Save (MPS), and the Keynesian fiscal multiplier from income and spending changes.

Calculate the Marginal Propensity to Save (MPS), MPC, and the Keynesian fiscal multiplier from income and savings changes across two periods.

Calculate Market Value Added (MVA) — the difference between a firm's market capitalisation and book equity — to measure wealth created for shareholders.

Calculate Net Asset Value (NAV) per share for mutual funds, ETFs, or investment companies, plus the premium or discount to market price.

计算扣税后的净薪资，支持瑞典、芬兰、丹麦和挪威预设 — 市政税、国家税、社会保险费和税收抵免，均可编辑。

Calculate the Net Promoter Score (NPS) from Promoter, Passive, and Detractor counts with a segment breakdown.

Calculate the Net Stable Funding Ratio (NSFR) for Basel III compliance — check whether Available Stable Funding meets Required Stable Funding.

Calculate your full monthly mortgage payment (PITI): Principal, Interest, property Taxes and homeowners Insurance — plus PMI if applicable.

Calculate monthly and annual PMI, your loan-to-value ratio, and when PMI will drop off your mortgage.

Calculate PPF maturity value, total interest earned and corpus growth year by year for any deposit amount, rate and period.

Calculate the PPP-implied exchange rate between two currencies from basket prices and compare it to the actual market rate to reveal over/under-valuation.

Calculate PVGO (Present Value of Growth Opportunities) to split a stock price into its no-growth earnings value and the market premium placed on future growth.

Calculate the maturity value and interest earned on a Recurring Deposit (RD). Enter your monthly installment, interest rate and term to see the total payout.

Calculate your rent-to-income ratio, total housing cost and monthly surplus. See whether your rent passes the 30% rule and how it fits into your overall budget.

根据你的当前年龄、退休年龄、当前储蓄、每月供款和预期年回报率，预测你的退休储备金。

Calculate your IRS Required Minimum Distribution (RMD) from a traditional IRA or 401(k) using the 2022 Uniform Lifetime Table.

Calculate Return on Assets (ROA) as net income divided by average total assets — a key measure of how efficiently a company uses its asset base to generate profit.

Calculate Return on Ad Spend (ROAS) as the ratio of ad-attributed revenue to ad spend. Enter optional COGS to see gross profit after advertising costs.

Calculate Return on Equity (ROE) as net income ÷ average shareholders' equity, with optional DuPont decomposition into margin, turnover and leverage.

以百分比计算投资回报率 (ROI)、净收益或损失，以及在你的持有期内的年化回报。

Calculate Return on Invested Capital (ROIC) as NOPAT divided by invested capital — the gold-standard metric for assessing whether a business creates or destroys shareholder value.

Calculate Return on Sales (ROS): operating profit divided by net revenue, expressed as a percentage — the operating margin.

Calculate the Relative Strength Index (RSI) from average gain and average loss over a period — with overbought/oversold signal zones.

使用你的每周工时和每年工作周数，在时薪、周薪、月薪和年薪数字之间转换薪酬。

将销售税加到价格上，或从含税总额中提取税款，显示净价、税额和含税价。

看看你的储蓄通过定期每月存款和复利将如何增长，包括总供款和已赚取的利息。

为某个本金、利率和时间段计算单利和总额。

Calculate the maturity value of India's Sukanya Samriddhi Yojana account — annual deposits, compound interest, total interest earned.

Calculate how long your investment corpus lasts with a fixed monthly withdrawal and expected annual return rate.

使用你自己的有效税率，根据税前收入估算实得（税后）工资。与国家无关：适用于任何薪资、支付频率和扣除项。

计算定期（固定）存款的到期价值和利息 — 支持按月、按季度或按年复利，以及可选的利息税。

Calculate OSHA's Total Recordable Incident Rate (TRIR) and benchmark your workplace safety against US industry averages.

Calculate Value at Risk (VaR) and Expected Shortfall (CVaR) for a portfolio using the parametric normal-distribution method at 90–99.9 % confidence.

将 VAT 加到净价上，或从含税价中扣除 VAT，为任意 VAT 税率显示净额、VAT 和含税总额。

Calculate WACC using equity and debt market values, cost of equity (CAPM), pre-tax cost of debt, and the corporate tax rate for the interest tax shield.

Calculate the Ankle-Brachial Index (ABI) from ankle and arm systolic pressures to screen for peripheral arterial disease (PAD).

Calculate your Army Combat Fitness Test (ACFT) score for all six events and see your total out of 600.

Calculate the urine albumin-to-creatinine ratio (ACR) from a spot urine sample to assess kidney health and CKD albuminuria category.

Estimate VO₂max from the Queens College Step Test 3-minute protocol — enter your 15-second post-exercise pulse count to get your aerobic fitness category.

Calculate the Apnea-Hypopnea Index (AHI) from a sleep study and classify sleep apnea severity per AASM guidelines.

Calculate the Absolute Neutrophil Count (ANC) from a CBC differential and classify neutropenia severity.

Calculate the APRI score (AST-to-Platelet Ratio Index) to estimate the probability of liver fibrosis and cirrhosis.

Estimate your blood alcohol concentration (BAC) using the Widmark formula. Enter drinks, weight, sex and time elapsed.

Calculate your Body Adiposity Index (BAI) — an estimate of body fat percentage from hip circumference and height, requiring no scale.

Analyse your basal body temperature (BBT) reading against your follicular baseline to detect the post-ovulation thermal shift and estimate cycle phase.

Calculate Biologically Effective Dose (BED) and EQD2 for any radiation therapy fractionation schedule using the linear-quadratic model.

Estimate Basal Energy Expenditure using the revised Harris-Benedict equation with optional stress and activity factors for clinical nutrition.

Score the Brief Interview for Mental Status (BIMS), a CMS MDS 3.0 cognitive screening tool used in nursing homes — three parts, total 0–15.

根据身高和体重计算你的身体质量指数 (BMI)，并给出 WHO 体重类别。

使用 Mifflin-St Jeor 公式估算你的基础代谢率 (BMR) 和每日热量需求。

使用美国海军围度法，根据以厘米为单位的颈围、腰围、臀围和身高测量值估算你的体脂百分比。

使用简单而准确的 Mosteller 公式，根据身高和体重以平方米计算体表面积 (BSA)。

Calculate your Body Roundness Index (BRI) from height and waist circumference — a shape-based body fat estimate that outperforms BMI.

Calculate body surface area (BSA) in m² using the Mosteller, Du Bois, or Haycock formula — with a side-by-side comparison of all three.

计算减重所需的每日卡路里目标。输入你的维持热量 (TDEE) 和每周目标，即可得到安全的每日摄入量和热量缺口。

使用《身体活动概要》中的 MET 值估算运动期间消耗的卡路里。选择一项活动，输入你的体重和时长。

Calculate the age-adjusted Charlson Comorbidity Index (CCI) from patient age and weighted comorbid conditions. Estimates 10-year survival probability.

根据你的末次月经或预产期，估算受孕日期，并给出几天的可能易孕受孕窗口。

Estimate creatinine clearance (CrCl) and kidney function stage using the Cockcroft-Gault equation from age, sex, weight, and serum creatinine.

使用 Mifflin-St Jeor 公式计算你的每日热量需求 (TDEE)，并得出用于减重、维持或增重的目标热量。

Look up the NIH Dietary Reference Intake (RDA/AI) for protein, fibre, vitamins, and minerals by age and sex.

Calculate your estimated due date and current pregnancy week using Naegele's rule, adjusted for your personal cycle length.

Estimate your kidney filtration rate (eGFR) using the CKD-EPI 2021 race-free equation from serum creatinine, age, and sex.

Calculate your new ELO rating and points gained or lost after a match using the standard ELO formula for win, draw, or loss.

Calculate power output, calories burned and distance for a rowing ergometer workout from your 500 m split time using the Concept2 formula.

Estimate how long EtG (ethyl glucuronide) remains detectable in urine after alcohol consumption, based on drinks consumed and time elapsed.

Calculate your daily fat intake in grams from total calories and a fat percentage target, with protein, carb, and saturated fat breakdowns.

Calculate the Front of Center (FOC) percentage for an arrow using length and balance point — essential for tuning accuracy and stability in archery.

Calculate a premature baby's corrected (adjusted) age by subtracting weeks born early from their chronological age.

根据末次月经 (LMP) 计算你已怀孕几周几天，并显示孕期阶段、预产期和剩余天数。

Calculate the Glycemic Load (GL) of a food from its Glycemic Index (GI) and carbohydrate content per serving.

Calculate the Glucose Infusion Rate (GIR) in mg/kg/min from dextrose concentration, infusion rate, and patient weight.

Calculate the Glasgow Coma Scale score from eye, verbal, and motor responses to assess level of consciousness.

根据你的年龄以每分钟心跳次数计算你的最大心率和五个训练区间，让有氧锻炼更高效。

Calculate the Hepatic Steatosis Index (HSI) from ALT, AST, BMI, sex and diabetes status to screen for non-alcoholic fatty liver disease.

Calculate ICC(1,1) or ICC(1,k) from one-way ANOVA mean squares to assess inter-rater or test-retest reliability, plus SEM and MDC₉₅.

Calculate the validated ICH Score (0–6) from GCS, hemorrhage volume, IVH, location and age to estimate 30-day mortality risk.

使用广泛采用的 Devine 公式，根据你的身高和性别以千克求出你的理想体重，并给出一个健康参考范围。

Calculate the International Normalized Ratio (INR) from PT, mean normal PT, and ISI — with therapeutic range interpretation for warfarin monitoring.

Calculate the Injury Severity Score (ISS) from AIS region scores to classify trauma severity from minor to unsurvivable.

Estimate LDL cholesterol from Total Cholesterol, HDL and Triglycerides using the Friedewald equation (mg/dL or mmol/L).

使用 Boer 公式，根据体重、身高和性别以千克估算你的瘦体重 (LBM)，外加近似脂肪量。

为均衡、低碳水或高蛋白饮食配比，将每日热量转换为碳水化合物、蛋白质和脂肪的克数。

Calculate the MCA-PSV Multiple of Median (MoM) for fetal anemia screening using the Mari 2000 formula. For use with specialist guidance.

Convert any opioid dose to morphine milligram equivalents (MME/day) using CDC 2022 conversion factors.

Calculate the Neutrophil-to-Lymphocyte Ratio (NLR) from CBC counts — a rapid blood-test marker for systemic inflammation.

Calculate NNT, NNH, ARR, RRR, Relative Risk and Odds Ratio from control and experimental event rates.

Calculate the real-world noise reduction and protected dBA level from a hearing protector's NRR rating, using NIOSH or EPA methods.

使用 Epley 公式从一组训练估算你的单次最大重量 (1RM)，并提供训练负荷百分比表（95%–70%）及对应目标重复区间。

根据末次月经和周期长度估算你的排卵日和易孕期，以及你下次预计来月经的日期。免费的排卵与生育力计算器。

根据你的末次月经和平均周期长度，预测接下来 3 次月经的开始与结束日期，以及预计排卵日。

Interpret a post-void residual (PVR) bladder scan — residual fraction, estimated capacity, and clinical severity category.

逐周追踪你的怀孕进程。输入末次月经，即可知道你当前的孕周、孕期阶段、预产期以及怀孕进度。

根据末次月经和周期长度，使用内格勒法则估算怀孕预产期。查看孕周、孕期阶段和受孕日期。

Calculate the Physiological Strain Index (PSI) from core body temperature and heart rate to quantify heat stress during exercise or occupational heat exposure.

Calculate the heart-rate-corrected QT interval (QTc) using Bazett, Fridericia, Framingham or Hodges formula — with prolongation risk interpretation.

Calculate your Resting Metabolic Rate (RMR) and TDEE using Mifflin-St Jeor or Katch-McArdle — choose based on whether you know your body fat %.

根据距离和完成时间计算你以分钟每千米计的跑步配速、以 km/h 计的速度以及每英里配速。

利用 90 分钟睡眠周期找到最佳就寝时间或起床时间。在两个周期之间而非周期中途醒来，会让你更精神、更不昏沉。

Calculate your bone density T-Score from a DXA scan BMD (g/cm²) and get a WHO classification: normal, osteopenia, or osteoporosis.

使用 Mifflin-St Jeor 公式，根据你的基础代谢率和活动水平估算每日总能量消耗 (TDEE)，并给出减重、维持和增重的卡路里目标。

Calculate the IV Alteplase (tPA) dose for acute ischemic stroke: total dose, IV bolus, and 60-minute infusion by patient weight.

Calculate the Urea Reduction Ratio (URR) from pre- and post-dialysis BUN values to assess haemodialysis adequacy against the KDOQI ≥ 65 % target.

计算你的腰臀比 (WHR)，并根据世界卫生组织针对男性和女性的阈值查看你的健康风险类别。

Calculate wound area reduction (WAR%) from initial and current wound dimensions to track healing progress and apply the validated 4-week 40% threshold.

根据你的体重和每日运动量估算你每天应该喝多少水，以升、毫升和杯显示。

在12小时制AM/PM格式与24小时制军用时间格式之间即时转换。

对一组时:分时长求和，并可选地从起始时间推算结束时间。

从某个日期加上或减去任意天数，求出结果日期和星期几。免费的日期加减天数计算器。

从任意日期时间中加减年、月、周、日、时、分、秒。

计算出生日期与任意日期之间精确的年、月、日年龄。

从任意参考日期查看以年、月、周、日、时和分表示的精确年龄。

计算两个日期之间的工作日（周一至周五），排除周末。免费的工作日和工作日数统计器。

找出从起始日期起N个工作日之后或之前的日历日期，跳过周末（及可选假日）。

实时倒计时，显示距任意未来日期时间剩余的天、时、分、秒。

解析5字段cron表达式，以自然语言描述，并从指定起始日期计算后续几次执行时间。

以年、月、日、周和总天数计算两个日期之间的精确差值。免费的在线日期间隔计算器。

将一个日期转换为多种格式：ISO 8601、美式、欧式、长格式、序数和Unix时间戳。

查找任意日期是星期几。免费的星期几计算器，显示星期、年内第几天、ISO 周数以及是否为闰年。

查找某日期是一年中的第几天（1-366）以及该年剩余天数。

查找任意年月的天数，自动处理闰年2月。

计算从今天到任意未来日期的天数，以及剩余的周数。免费的倒数到某日的计算器。

倒计时距您下次生日的天数，并显示您将年满的岁数。

将小数小时转换为时:分:秒，或反向转换，适用于薪资和工时追踪。

将Unix时间戳转换为UTC或任意固定时区偏移下的可读日期，并提供完整日期时间分解。

在Excel/Sheets序列日期数字与日历日期之间互转，支持1900和1904两种日期系统。

将P1Y2M10DT2H30M等ISO 8601时长转换为总秒、分、时和天，或从各组件构建时长字符串。

在格里历日期与ISO 8601周日期（YYYY-Www-D）之间互转，包含ISO周数和星期几。

将 ISO 8601 年份和周数转换为该周的精确日历日期。

在格里历日期与天文学儒略日数（JDN）和儒略日期之间进行转换。

使用格里高利历规则检查任意年份是否为闰年，了解原因，并列出接下来的几个闰年以及二月的天数。

即时在24小时军事时间与12小时AM/PM制之间转换。

在台湾使用的民国（中华民国）纪年与西方公历年份之间互换——民国年 = 公历年 − 1911。

计算两个日期和时间之间的精确分钟数（以及秒数和小时数）。

查找任意日期的近似月相、光照百分比和月龄。

在日历日期与ISO序数日期格式YYYY-DDD（年份加年内日序数）之间转换。

用于跑步、骑行和步行的配速、速度、距离或时间求解器，支持单位换算。

使用自定义财年起始月确定任意日期的日历季度、财政季度和财政年度。

在RFC 2822/电子邮件头格式（如「Tue, 27 Jun 2026 14:30:00 +0000」）与其他格式之间转换日期。

按半球查找某日期所属的气象/天文季节及其进度。

根据90分钟睡眠周期和入睡时间，计算理想的就寝时间或起床时间。

使用NOAA太阳公式计算任意地点和日期的日出、日落和白昼长度。

将过去的日期和时间转换为人性化的相对时间短语，并提供完整分解。

计算两个时钟时间之间的持续时间，可选跨越午夜。

添加每日上下班打卡时间和休息时间，获取总工时、加班时间和应得工资。

以小时和分钟计算两个时间之间的时长，包括跨夜时段。免费的时间差计算器。

Convert the time between any two cities or time zones, with a live world globe showing day and night. Pick two cities, enter a time, see the local time in the other.

将Unix纪元毫秒转换为人类可读的日期和时间，以及反向转换，精确到秒和毫秒。

将 Unix 时间戳（纪元秒数）转换为人类可读的 UTC 和本地日期，并将任意日期转换回 Unix 时间戳。

使用从-12:00到+14:00的固定UTC偏移量，在UTC时间与任意本地时区之间进行转换。

求出任意日期的 ISO 8601 周数，以及 ISO 周年和星期几。免费的“今天是第几周”计算器。

计算两个日期之间（含端点）有多少个周一、周五或任意星期几。

计算两个日期之间完整周数和剩余天数，以及小数形式的周数总计。

根据上班打卡和下班打卡时间减去休息时间，以十进制小时和小时:分钟形式计算工作时长。免费的考勤工时计算器。

Calculate arc length, radius, included angle and area of a circular arch from span and rise. For doorways, bridges and architectural arches.

计算任意尺寸的长宽比，并求取保持原始比例的缺失宽度或高度。

Calculate how much asphalt (hot-mix) you need by weight and volume from area length, width and thickness. Supports metric and imperial.

Check if your bag meets airline weight limits. Enter bag weight, the airline allowance and the per-kg excess fee to see total charges.

Find out how long you can safely stay in the sun without burning, based on UV index, your Fitzpatrick skin type and sunscreen SPF.

将含税费和小费的账单平均分摊给任意人数。

根据厚度、宽度、长度和数量计算木材的板英尺数及总费用。

Convert BPM to note durations in milliseconds, find the Italian tempo marking, and get beat frequency in Hz for any music tempo.

根据墙面面积和砖块尺寸（减去开洞面积）估算所需砖块和砂浆用量。

Calculate how much salt to add to water for any brine concentration — perfect for pickling vegetables, lacto-fermentation, and curing.

Convert butter between US sticks, cups, tablespoons, teaspoons, grams, ounces, and pounds in one click.

计算步行、跑步、骑行或游泳需要多少分钟才能消耗指定的卡路里数。

根据固定门幅宽度计算所需地毯面积和线米数，含匹配和余料损耗。

根据房间地板面积推荐合适的吊扇叶片直径，并提供吊杆长度建议。

Calculate cement bags, sand and aggregate for any volume of concrete. Choose a standard mix grade (M10–M25) or enter a custom ratio to get material quantities instantly.

Calculate the required CFM airflow for any room using its dimensions and target air changes per hour (ACH).

Convert octal chmod digits (e.g. 755) to symbolic file permissions (rwxr-xr-x) and see what each bit means.

Calculate the chord length, sagitta, arc length and circular segment area from a circle radius and central angle.

Enter an IPv4 CIDR block (e.g. 10.0.0.0/8) to get its network range, host count and how many subnets of a chosen prefix fit inside it.

Calculate the exact grams of coffee grounds and ml of water for any brewing method — drip, espresso, French press, pour over, AeroPress or cold brew.

统计您每日咖啡习惯每周、每月和每年的实际花费。

为任意冲煮强度或杯数获取克数精确的咖啡与水比例。

估算包括燃油、过路费和停车费在内的每日、每月和每年驾车通勤费用。

根据长度、宽度和厚度（公制或英制单位）估算楼板所需的混凝土。得出以立方码和立方米计的体积，以及 40、60 和 80 磅袋装混凝土的数量。

根据总价格和份数计算每份餐食的成本。

根据价格和使用频率查看任何购买物品的真实每次使用成本。

Add or subtract any number of days from a date to find a future or past date. Shows the day of week, weeks, and approximate months.

根据甲板尺寸、板材宽度和搁栅间距估算甲板板材、搁栅和紧固件数量。

Estimate how many diapers your baby needs and the total cost over any period, from a few weeks to a full year.

投掷任意数量和面数的骰子（NdM），显示每颗骰子的点数及总计。

计算任意折扣百分比下的售价以及你节省的金额。

Calculate the volume and surface area of a torus (donut shape) from major radius R and minor radius r in any length unit.

通过图像像素和尺寸计算打印DPI，或计算清晰打印所需的像素数。

Calculate Defects Per Million Opportunities (DPMO), the Six Sigma sigma level, and process yield for quality analysis.

根据墙面和天花板面积计算房间所需的石膏板、螺钉、接缝填料和纸带数量。

Find the exact date of Easter Sunday for any year from 1583 to 9999 using the Meeus/Jones/Butcher Gregorian algorithm.

Calculate your effective DPI (eDPI) by multiplying mouse DPI × in-game sensitivity, and find your cm/360° rotation distance.

根据功率、每天使用小时数、天数和你的每千瓦时电价，计算电器以 kWh 计的耗电量及其运行成本。

Calculate how much epoxy resin and hardener to mix for any casting or tabletop project — enter mold dimensions, mix ratio and a waste allowance.

Calculate a building's Energy Use Intensity (EUI) in kBtu/sq ft/yr or kWh/m²/yr from annual electricity and gas use, with ENERGY STAR benchmark comparison.

Calculate how many yards or metres of fabric you need for any sewing or quilting project. Includes seam allowance, waste factor and bolt-width layout.

根据总长度和间距计算一段围栏所需的立柱、板材、横档和竖板。

Calculate the Exposure Value (EV) from your aperture, shutter speed and ISO — instantly see how your camera settings map to scene brightness.

根据你目前的成绩和考试权重，准确算出你在期末考试中需要取得多少分才能达到目标成绩。

通过长、宽、高将堆叠木垛转换为捆和面捆，并检查每捆价格。

Calculate flag height, area, diagonal and perimeter from the width and aspect ratio — useful for ordering fabric or making flags to correct proportions.

Calculate the exact nut-to-fret distance for any fret on a guitar, bass or other fretted instrument from the scale length.

根据距离、车辆效率和油价估算任何行程的燃油费用，并给出所需升数和每千米成本。

Calculate gas cost for any trip from distance, MPG or L/100 km, and fuel price — plus fuel needed and CO₂ emissions.

通过汇总所需电器的运行瓦数和启动瓦数，为备用发电机选型。

将节日或活动礼物预算公平地分配给名单上的每个人。

根据每门课程的绩点和学分时数计算你的平均绩点——在几秒内得出快速、准确的加权 GPA。

Calculate your weighted average grade from up to five assignments or exams. Enter each score and its percentage weight to get the final grade and letter grade instantly.

根据面积和推荐播种率计算新草坪或补种所需购买的草籽数量。

根据长度、宽度和深度计算你需要多少砾石或骨料——得出以 m³ 和 yd³ 计的体积、以公吨和美吨计的重量，以及成本。

Calculate how much grout you need for any tiled surface. Enter tile size, joint width, grout depth, and total area to get kg and bag counts with a waste allowance.

按 5%、12%、18% 或 28% 加上或扣除 GST，并即时显示净额、所收 GST 和含税总额。

Check whether your vehicle is within its Gross Vehicle Weight Rating. Enter GVWR, curb weight, cargo and passengers to see remaining payload capacity and load percentage.

Calculate your GWA (General Weighted Average) for the Philippine academic system. Enter up to five subject grades (1.0–5.0 scale) and credit units to get your weighted average and honor standing.

Calculate GWAM (Gross Words A Minute) and NWAM (Net WPM) from keystrokes, test time and errors — with a speed-tier benchmark.

Calculate hours and minutes between a start time and an end time, with optional break deduction — gives decimal hours and H h MM min format.

将IPv4地址转换为32位十进制整数（及十六进制/二进制），或将整数转换回点分十进制格式。

Calculate your Kill/Death (K/D) ratio, KDA ratio and win rate — for any FPS, battle royale or MOBA game.

估算房间所需的强化地板或实木地板包数和地板条数，包含切割损耗余量。

根据袋装标注的NPK百分比，计算达到目标含氮量所需施用的肥料用量。

Calculate the LM317 output voltage from R1 and R2, or find R2 for a target output voltage — with minimum input voltage and power dissipation.

随机抽取彩票号码（如49选6），不重复，并带有可选的奖励球。

Calculate how many lumber boards you need for a deck, floor, or wall project, with a waste allowance and total cost estimate.

Convert any number of minutes to hours, seconds, days and weeks — and see the result in H h MM min format for timesheets and scheduling.

根据面积、瓷砖尺寸和接缝宽度估算贴砖工程所需的薄型砂浆和填缝剂。

Calculate how much cement, sand and water you need for a masonry mortar mix from area, joint depth and mix ratio.

Calculate miles per gallon (MPG) or L/100 km fuel economy, plus trip cost and cost per mile from distance and fuel used.

通过花坛长、宽和深度查找所需的立方码或袋装护根物数量，含袋数和体积。

根据你的墙面面积、油漆每升的覆盖率和涂刷遍数，算出你需要多少升油漆。

Calculate how many boxes fit on a standard pallet, how many layers stack within a height limit, and the total loaded weight.

Calculate the even or odd parity bit for any binary word — shows the complete data word with its parity bit appended.

根据宾客数量和时长规划派对所需的食物、饮料和冰块采购量。

根据密码长度和字符集估算密码强度（熵位数）和近似破解时间。

生成强随机密码，并以熵位数衡量其强度。

根据露台面积和铺路石尺寸，计算所需铺路石数量及铺底沙用量。

Calculate the PERT expected task duration, standard deviation and confidence intervals from optimistic, most likely and pessimistic time estimates.

Calculate how many pizzas to order for any group size — choose appetite level, slices per pizza and an optional buffer for seconds.

Calculate pond volume in US gallons and litres for rectangular, oval or circular ponds, plus pump size and fish stocking capacity.

Calculate swimming pool volume in US gallons and litres, shock chlorine dose and filter pump size for rectangular, oval or circular pools.

根据分辨率和对角线尺寸，计算显示器的每英寸像素数和点距。

Calculate how much fabric you need for a quilt: top, backing and binding yardage from quilt size, block size, seam allowance and fabric width.

从参赛名单中随机抽取一名或多名获奖者，支持可选的加权票数。

Calculate usable capacity, storage efficiency, and fault tolerance for RAID 0, 1, 5, 6, 10, 50 and 60 arrays from disk count and disk size.

立即生成随机颜色并获取其HEX、RGB和HSL代码。

在你所选的任意范围内生成一个或多个随机整数——非常适合抽签、挑选、游戏、抽样和快速决策。

将名单随机打乱并分成规模均衡的随机队伍。

根据字数和阅读速度估算阅读一段文本所需的时间。

Calculate the weight of steel rebar (reinforcing bar) for construction. Enter the diameter, length and quantity to get weight per bar and total weight in kg.

通过将每种食材按所需份数缩放，即时将任意食谱翻倍、三倍或减半。

根据屋顶占地面积和坡度，估算屋顶覆盖平方数和瓦片捆数，包含屋脊和切割损耗。

根据房间面积、日照、层高和人数，计算空调或取暖器所需BTU容量。

Convert RPM to angular velocity (rad/s), frequency (Hz), period, and peripheral speed — for motors, engines, wheels, and fans.

Calculate the sag (mid-span deflection) and cable length of a wire or cable between two supports using the parabolic and catenary formulas.

Calculate how much sand you need by volume (m³, yd³) and weight (tonnes, kg) from area length, width and depth. Supports metric and imperial.

将屏幕的对角线尺寸和宽高比转换为实际宽度、高度和面积。

Estimate calories burned during sexual activity by body weight, duration and intensity, using MET values from Ainsworth's Compendium (2011).

Calculate how many squares of exterior siding you need from house dimensions, gables, openings and waste allowance. Supports metric and imperial.

计算覆盖草坪所需的草皮卷或托盘数量，包含修剪损耗量。

根据长度和宽度，以平方英尺和平方米计算矩形房间或空间的面积，并可选地估算材料总成本。

根据总高差计算楼梯踢板、踏板和斜梁长度，并检查2R+T舒适性规则。

Calculate stair riser height, tread going, stringer length and pitch angle from total rise and number of risers.

Calculate how many tonnes of decorative stone, pebbles or chippings you need by area and depth, with bag count and cost estimate.

输入IPv4地址和前缀（CIDR），获取网络地址、广播地址、可用主机范围、主机数量和子网掩码。

将所有流媒体和应用订阅费用汇总为每月和每年的总额。

Calculate sulfur (SO₂) emissions from burning coal, oil or diesel by entering the fuel mass and its sulfur content by weight.

Calculate the included taper angle, half-angle, taper per foot (or per 300 mm) and taper ratio from two diameters and a length.

Calculate pitch diameter, minor diameter, thread depth and lead angle for metric ISO and unified (UNC/UNF) screw threads.

根据房间面积和瓷砖尺寸算出地面需要多少块瓷砖，并为切割和破损预留损耗量。

算出小费、账单总额和每人金额——非常适合分摊餐厅账单。

根据面积和填充深度，估算花圃或草坪所需的表层土体积、重量和袋数。

估算含运营成本和残值的汽车或家电的完整拥有成本。

Calculate how US import tariffs raise the landed cost of goods — enter unit price, the applicable tariff rate, and quantity to get the total after-tariff price.

通过计时测试计算每分钟打字字数、净WPM和准确率。

通过每单位价格比较两款产品，找出更便宜的选择——破解误导性的包装规格，每次都挑出最超值的。

将可用性 SLA 百分比（如 99.9%）转换为每天、每周、每月和每年允许的停机时间。

Calculate the allowed downtime per year, month, week, and day for any uptime SLA percentage — from 90 % (one nine) to 99.9999 % (six nines).

根据房间尺寸、卷材规格和图案循环，计算所需墙纸卷数，并已考虑裁切和损耗。

Convert any number of weeks to days, hours, minutes, seconds, months and years instantly. Fractional weeks are supported.

根据给定高差计算坡道长度和坡度，并与 ADA 1:12 最大值进行比较。

让随机性来决定：以可调概率获得随机的「是」或「否」答案，并查看概率分布。

Calculate classification accuracy, precision, recall, F1 score, specificity and NPV from a confusion matrix (TP, TN, FP, FN).

Run a one-way ANOVA F-test from group summary statistics (n, mean, SD) and get the F statistic, p-value, and effect size.

利用灵敏度和假阳性率，通过贝叶斯法则将先验概率更新为后验概率。

计算 n 次试验中恰好 k 次、至多或至少 k 次成功的二项概率，以及均值和方差。

任意群体规模和天数下，至少两人同天生日的概率。

不放回从牌堆中抽取 n 张时，恰好 k 张或至少一张有利牌的概率。

使用卡方检验测试观测计数是否与期望计数或比例匹配。

从列联表检验两个分类变量之间的关联性。

从数据或汇总统计量计算变异系数（CV = SD/mean），以百分比表示。

n 次抛硬币中（公平或有偏）恰好、至少或至多 k 次正面朝上的概率。

从联合概率和 P(B) 求 P(A 在 B 条件下)，并检验两事件是否独立。

使用 z 分布计算均值的置信区间。免费的在线置信区间计算器，适用于 90%、95% 和 99% 水平，显示误差幅度、下界和上界。

计算两个数据集之间的皮尔逊相关系数 (r)，以衡量它们线性关系的强度和方向。免费的在线相关性计算器，带有 r² 和斜率。

计算两个等长变量 x 和 y 的样本或总体协方差。

Calculate all nine deciles (D1–D9) for any data set. Deciles divide data into ten equal parts at the 10th, 20th, … 90th percentiles.

为任意数据集计算均值、中位数、众数、极差、方差和标准差。

Calculate the expected value, min, max, variance, and standard deviation for any dice expression (NdS + modifier).

掷任意数量和类型骰子得到目标总点数（恰好、至少或至多）的概率。

将 68-95-99.7 规则应用于正态数据集：获得一、二、三个标准差区间和百分比。

从离散概率分布表计算期望值、方差和标准差。