Math & Science
Permutation Calculator
Calculate permutations (nPr)
Created and maintained by: CalcTago Editorial TeamLast updated: 2026-02-13
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
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Frequently asked questions
What does the Permutation Calculator do?
It helps you calculate permutations (nPr).
What inputs do I need?
Enter n and r.
Are decimals supported?
Yes, you can use decimal values where appropriate.
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About this tool
This Permutation Calculator helps you calculate results from the values you enter, without unnecessary steps. Fill in the fields and review the calculated output.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.