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Factorial Calculator

Calculate factorial (n!), permutations (nPr) and combinations (nCr) instantly.

n (0–20)

n (total, 0–20)

r (chosen)

n (total, 0–20)

r (chosen)

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About Factorial Calculator

Our free Factorial Calculator helps you run quick, accurate calculations for everyday financial and mathematical needs with just a few inputs. Calculate factorial (n!), permutations (nPr) and combinations (nCr) instantly. Enter your values, and the calculator instantly shows detailed results with breakdowns you can understand. No signup, no ads interrupting your workflow — just accurate, reliable calculations you can trust. Works on any device, saves nothing to our servers.

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