Factorial Calculator
Calculate the factorial (n!) of a number.
Result
Results are estimates for general information only and are not professional advice.
Factorials
The factorial of a number n (written n!) is the product of all whole numbers from 1 to n. Factorials are central to permutations, combinations and probability. This calculator handles values from 0 up to 170.
Frequently Asked Questions
What is the Factorial Calculator?
Calculate the factorial (n!) of a number. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Factorial Calculator?
The Factorial Calculator asks for a single value: Number (0–170). Enter it and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Factorial Calculator?
The Factorial Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Factorial Calculator free, and do I need an account?
Yes. The Factorial Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.