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Factorial Calculator
Calculate the factorial of any integer n, including large values, with instant results for permutations, combinations, homework, and probability exercises.
How to use this tool
- Enter a value for n, then run the calculation.
- For integers, review the exact BigInt result and optional small-n expansion.
- Copy or download a structured result report for reuse.
Calculation behavior
- Non-negative integers are computed exactly using BigInt arithmetic.
- Non-integer inputs are estimated via Gamma function approximation.
- Very large integer inputs are capped for browser safety.
Common use cases
- Combinatorics and probability exercises involving permutations and arrangements.
- Algorithm analysis demos where factorial growth is relevant.
- Quick generation of values for teaching notes or coding challenges.
FAQ
- Why are negative integers rejected?
- Standard factorial is undefined for negative integers, so the tool blocks them.
- Are large integer results exact?
- Yes, within the supported input range, results use BigInt for exact integer arithmetic.
- Can I export results?
- Yes. You can copy a text report or download TXT/JSON output.
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