How to Use Permutation & Combination Calculator
Calculate permutations (nPr) and combinations (nCr) for n and r.
Open the Permutation & Combination Calculator tool →What is Permutation & Combination Calculator?
Calculate permutations (nPr) and combinations (nCr) for n and r. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Permutation & Combination Calculator
- Open the Permutation & Combination Calculator tool.
- Enter your details or values.
- The result is calculated instantly.
- Copy or use the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
What's the difference between a permutation and a combination?
Permutations count ordered arrangements (nPr = n!/(n−r)!); combinations count selections where order doesn't matter (nCr = n!/(r!(n−r)!)).
When do I use each?
Use permutations when order matters (like a race podium) and combinations when it doesn't (like choosing a committee).
Ready to try it?
Open Permutation & Combination Calculator →