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✖️ Factorial Calculator

Calculate the factorial of any integer n with large number support.

Factorial Calculator

Compute n! quickly and safely. Factorials grow fast, so inputs above 5000 are limited to prevent performance issues.

Determine permutations and combinations in statistics or probability homework.
Estimate algorithm complexity when analyzing brute-force search spaces.
Generate values for math worksheets, coding challenges, or technical interviews.

Stick to integers—fractional factorials require the gamma function, which is outside this tool's scope.
Large outputs can contain thousands of digits; copy them to a text editor for easier review.
Inputs over 5000 are blocked to keep browsers responsive. Break advanced work into smaller steps or use a CAS if needed.

Why are negative numbers rejected?: Factorials are only defined for non-negative integers. The tool prevents invalid calculations and flags them with a helpful message.
What powers the large-number support?: JavaScript BigInts provide precise integer arithmetic without rounding, so the results stay accurate even for massive factorials.
Can I export the digits?: Yes. Use the Copy button to send the entire formatted string to your clipboard for spreadsheets or code.

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