健康與健身

從身高與體重計算你的身體質量指數（BMI），並附 WHO 體重分類。

使用美國海軍圍度法，以公分為單位的頸圍、腰圍、臀圍與身高量測，估算你的體脂肪百分比。

使用 Mifflin-St Jeor 公式計算你的每日卡路里需求（TDEE），並取得減重、維持或增重的目標卡路里。

根據您的末次月經 (LMP) 得知您懷孕幾週幾天，並附上孕期階段、估算預產期與剩餘天數。

從你的年齡，以每分鐘心跳數計算你的最大心率與五個訓練區間，讓有氧運動更聰明。

使用廣為採用的 Devine 公式，從你的身高與性別以公斤求出你的理想體重，並附健康參考範圍。

使用 Epley 公式從一組訓練估算您的單次最大重量 (1RM)，並附上訓練負荷的百分比對照表 (95%–70%) 與目標反覆次數範圍。

根據您的末次月經與週期長度估算排卵日與易孕期，並推算您下一次預期的月經日期。免費的排卵與生育計算器。

逐週追蹤您的懷孕進度。輸入您的末次月經，即可得知目前的妊娠週數、孕期階段、估算預產期，以及懷孕進展程度。

使用內格萊氏法則 (Naegele's rule)，根據您的末次月經與週期長度估算懷孕預產期。查看妊娠週數、孕期階段與受孕日期。

計算你的腰臀比（WHR），並依世界衛生組織針對男性與女性的閾值查看你的健康風險分類。

根據你的體重與每日運動量估算你每天該喝多少水，以公升、毫升與杯顯示。

使用 Mifflin-St Jeor 公式估算你的基礎代謝率（BMR）與每日卡路里需求。

使用簡單而準確的 Mosteller 公式，從身高與體重以平方公尺計算體表面積（BSA）。

算出減重所需的每日熱量目標。輸入您的維持熱量 (TDEE) 與每週目標，即可得到安全的每日攝取量與赤字。

使用《身體活動綱要》(Compendium of Physical Activities) 的 MET 值估算運動所消耗的熱量。選擇一項活動，輸入您的體重與時間。

根據您的末次月經或預產期估算您的受孕日期，並提供數天範圍的可能受孕窗口。

使用 Boer 公式，從體重、身高與性別以公斤估算你的淨體重（LBM），並附近似的脂肪量。

將每日卡路里換算為碳水化合物、蛋白質與脂肪的公克數，適用於均衡、低碳或高蛋白飲食配比。

根據您的末次月經與平均週期長度，預測接下來 3 次月經的開始與結束日期，以及您估算的排卵日。

從距離與完成時間計算你以每公里分鐘數表示的跑步配速、以 km/h 表示的速度，以及每英里配速。

利用 90 分鐘的睡眠週期找出最佳就寢或起床時間。在週期之間醒來而非週期中途醒來，能讓您感覺更清爽、更不昏沉。

使用 Mifflin-St Jeor 公式，根據您的 BMR 與活動量估算每日總能量消耗 (TDEE)，並提供減重、維持與增重的熱量目標。

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.

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.

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

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

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.

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.

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.

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).

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.

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

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 %.

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

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.

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