Big Number Calculator

Most calculators use 64-bit floating-point, which only stores about 15–17 significant digits. Anything longer gets rounded. This calculator uses BigInt integer arithmetic, which is exact no matter how many digits you enter.

There is no fixed digit limit — paste integers of any length. Factorials are capped at 5,000 and powers at an exponent of 100,000 so the page never freezes.

No — this tool works on whole numbers only. Decimal input is rejected with a message. For division, choose how many decimal places the result should be truncated to.

The calculator scales the dividend by 10^places, performs exact integer division, then places the decimal point. The result is truncated (not rounded) at the chosen number of places — for example 1 ÷ 3 at 10 places gives 0.3333333333.

How many digits the exact result contains, ignoring any minus sign or decimal point. For example, 2^100 has 31 digits and 25! has 26 digits.