Factorial calculator

Client

Compute n! for non-negative integers—pair with combinations when you need nCr or nPr.

About Factorial calculator

Compute n! for whole numbers up to 500—BigInt factorial in your browser, no upload. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

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Nearby workflows on Toolcore

  • Combinations & permutations — Calculate nCr and nPr for counting problems—BigInt combinatorics in your browser. when units or numeric output should be checked on a related calculator.
  • Prime number checker — Test whether a whole number is prime—BigInt trial division in your browser, no upload. when units or numeric output should be checked on a related calculator.
  • Math expression evaluator — Evaluate basic + − × ÷ arithmetic with parentheses in your browser—no variables. when units or numeric output should be checked on a related calculator.
  • GCD & LCM calculator — Greatest common divisor and least common multiple for two non-negative integers—BigInt, local only. when units or numeric output should be checked on a related calculator.

Common use cases

  • Verify factorial steps in probability or combinatorics homework.
  • Get exact integer values before plugging into nCr or nPr formulas.

Common mistakes to avoid

  • Expecting decimals

    Factorial is defined only for non-negative integers.

FAQ

What is 0!?

0! is defined as 1 by convention.

Is data uploaded?

No. Calculation runs entirely in your browser.

More tools

Related utilities you can open in another tab—mostly client-side.