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Permutation & Combination Calculator

Calculate nPr, nCr and factorials for counting and probability problems.

To calculate permutations and combinations, enter the total number of items and how many you are choosing. Permutations count ordered arrangements, combinations count unordered selections, and the tool shows both alongside the relevant factorials.

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Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

When do I use nPr instead of nCr?

Use nPr when order matters — race positions, passwords, seating arrangements. Use nCr when it does not — lottery numbers, committee members, a hand of cards.

How to use the permutation & combination calculator

  1. 1Set the total items (n).
  2. 2Set the chosen items (r).
  3. 3Choose the calculate.
  4. 4The result appears immediately — copy or download it.

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Put the working permutation & combination calculator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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