Free Permutations & Combinations Calculator
Compute nPr, nCr and factorials exactly.
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About the Permutations & Combinations Calculator
Free permutations and combinations calculator. Enter n and r to compute permutations (nPr, order matters), combinations (nCr, order doesn't) and factorials — with big-integer precision for large values. Runs in your browser.
How it works
- 1
Enter n and r
Total items and how many chosen.
- 2
See nPr and nCr
Ordered and unordered counts.
- 3
Check factorials
Exact big-integer results.
Frequently asked questions
Permutations count ordered arrangements (ABC ≠ CBA); combinations count selections where order doesn't matter (ABC = CBA).
Factorials are computed with big integers, so results stay exact. n is capped at 170 to keep it responsive.