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Factorial Calculator
Calculate the factorial (n!) of any number with exact big-integer precision.
Free · No sign-up · Updated August 2026
10! =
3628800
7 digits
The factorial n! is the product of all whole numbers from 1 to n. Computed with exact big-integer math in your browser.
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
What is a factorial?＋
The factorial of n (written n!) is the product of all whole numbers from 1 to n. For example, 5! = 5×4×3×2×1 = 120. By definition, 0! = 1.
Can it handle large numbers?＋
Yes — it uses exact big-integer math, so even large factorials are computed precisely (not rounded), up to n = 8000.