Big Integer Calculator
Perform exact arithmetic on arbitrarily large whole numbers far beyond ordinary floating-point limits.
Operation
How does this calculator work?
A big integer calculator does exact arithmetic on whole numbers of any size. Enter two integers, pick add, subtract, multiply, integer divide, modulo, or power, and it returns the precise result with no rounding, plus the number of digits. Division and modulo need a non-zero divisor; exponents must be non-negative.
Formula
How this is calculated
Enter two whole numbers of any length into the first integer (a) and second integer (b) fields, then choose an operation. Both inputs are parsed as native JavaScript BigInt values, which store integers exactly with no rounding, so even numbers with thousands of digits remain precise.
The selected operation is applied directly: addition (a + b), subtraction (a − b), multiplication (a × b), integer division (a ÷ b, truncated toward zero), modulo (a mod b, the remainder), or exponentiation (a ^ b). Division and modulo require a non-zero second operand; exponentiation requires a non-negative exponent because BigInt has no fractional powers. The result is reported as an exact decimal string along with its digit count.
Inputs must be plain integers (an optional leading sign followed by digits) — decimals, fractions and scientific notation are not accepted. Because exponentiation can grow extremely fast, very large exponents are blocked to avoid freezing the page. Truncated integer division means a ÷ b discards any fractional part, matching the standard quotient-remainder relationship a = (a ÷ b) × b + (a mod b).
Frequently asked questions
There is no fixed cap — BigInt grows to use available memory, so numbers with thousands of digits are handled exactly. Only exponentiation is limited, to keep the result from becoming impractically huge.
Division truncates toward zero, returning only the whole-number quotient. Use the modulo operation to get the remainder. Dividing or taking the modulo by zero is undefined and reported as an error.
This tool works with integers only to guarantee exact results. Any decimal point, fraction, or exponent notation in the input will be rejected as invalid.
Also known as
TG we-Calculate Editorial Team. (2026). Big Integer Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/big-integer-calculator
TG we-Calculate Editorial Team. "Big Integer Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/big-integer-calculator.
TG we-Calculate Editorial Team, "Big Integer Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/big-integer-calculator
@misc{wecalculate_big_integer_calculator, title = {Big Integer Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/big-integer-calculator}}, year = {2026}, note = {TG we-Calculate} }
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