Math & Calculators / Permutation and Combination Calculator
Permutation and Combination Calculator
Calculate nPr and nCr for any n and r.
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Permutation and Combination Calculator
Calculate nPr and nCr for any n and r.
Features
- Calculates nPr and nCr together
- Supports n up to 170
- Clear error checking on inputs
- 100% free, no signup
How to Use
Step 1
Enter n, the total number of items.
Step 2
Enter r, the number of items chosen.
Step 3
Click Calculate to see permutations and combinations.
About This Tool
Permutation and Combination Calculator computes both nPr (permutations) and nCr (combinations) for any total items n and chosen items r, useful for probability and statistics coursework.
Frequently Asked Questions
What is the difference between permutations and combinations?
Permutations count arrangements where order matters, while combinations count selections where order does not matter.
Why is there a limit on n?
Factorials grow extremely fast, so n is capped at 170 to stay within standard floating-point number limits.