Math & Science
Permutation & Combination
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Calculate permutations (nPr) and combinations (nCr) instantly. Enter n and r to get ordered arrangements and unordered selections with full factorial breakdown. Free, instant, no signup.
Quick reference
| Formula | Use when | Example |
|---|---|---|
| nPr = n! / (n−r)! | Order matters | Race podium positions |
| nCr = n! / (r!(n−r)!) | Order doesn't matter | Choosing a committee |
How to Calculate Permutations and Combinations (2026)
How to Calculate Permutations and Combinations — free online tool and guide with examples.