▣ CALCULATORS Updated July 25, 2026

Factorial Calculator

n! for any whole number, instantly.

Number (n)
Result
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How it works

Factorials are built by multiplying every integer from 1 to n. Values above 170! exceed the maximum double-precision number, so the tool caps input there and uses BigInt for exact digits up to 500.

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Frequently asked questions

What is 0 factorial?

0! equals 1 by definition, which keeps combinatorics formulas consistent.

Why the limit at 170?

171! overflows the floating-point range, so larger values are shown as exact BigInt digit strings only.

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