About the Permutation Calculator P(n,r)
Permutation Calculator P(n,r) does the math for you. Enter your values in the format shown and the result appears immediately — no spreadsheets, no formulas to remember, and nothing is uploaded to a server.
How Permutation Calculator P(n,r) works
Permutations: P(n,r) = n! ÷ (n−r)!.
Worked example: P(5,2) = 5! ÷ 3! = 120 ÷ 6 = 20
How to use
- Enter your values as shown in the input box.
- The result is calculated instantly.
- Click Copy to use it.
Common uses
- Quick everyday math.
- Double-checking figures fast.
- Schoolwork and homework.
- Finance, health and planning.
Frequently asked questions
Is my data uploaded?
No — the calculation runs entirely in your browser, so your data stays private.
Is it free?
Yes — completely free with no sign-up.