Math & Scientific
Permutation Calculator
Permutation Calculator is a browser-based calculator tool on CalcToolsBase. Free, browser-based Permutation Calculator with instant, clearly-labelled results. No signup, no uploads. To use it, enter your values and view the result directly in your browser — no signup and nothing to install.
From your n and r, Permutation Calculator computes the result via the standard method. No accounts, no uploads — just an instant way to work through a calculation.
About this calculator
The Permutation Calculator is a browser-based tool that helps you work through a calculation. You enter your n and r, and it applies the standard method to return the result. Everything runs locally — no sign-up, no uploads, nothing stored — so it stays fast and private.
Made for students and anyone checking their working, it gives the result from your n and r in one step — clearly laid out, free to use, and computed entirely on your device.
How to use
- Enter n, the size of the full set.
- Enter r, how many you arrange.
- Press Calculate to compute P(n, r).
- Read the number of ordered arrangements, with combinations shown for comparison.
Why use Permutation Calculator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Uses standard, well-established formulas; check critical results independently.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Permutation when revising for exams
Permutation for verifying answers from a textbook
Permutation in research and report calculations
Permutation for quick mental-math cross-checks
Permutation for understanding a formula's behaviour
Permutation for science-fair and project numbers
Technical notes
Permutation Calculator counts arrangements where order matters using P(n, r) = n! / (n−r)!.
Inputs are taken exactly as entered, so check for typos before trusting an answer.
Because it runs locally, results appear instantly with no server round-trip.
FAQ
When should I use a permutation instead of a combination?
Use a permutation when the order matters, such as ranking finishers in a race; use a combination when order does not matter, such as choosing a team.
Are large permutation results exact?
Yes. Permutations are computed with exact integer arithmetic, so large values are returned precisely.
Do n and r need to be whole numbers?
Yes. Because you are arranging whole items, both n and r must be non-negative whole numbers with r no greater than n.
Does the Permutation Calculator send my data to a server?
No. The Permutation Calculator runs entirely in your browser, so nothing you enter is uploaded, stored, or shared.
Worked example
Arrange 2 of 5: P(5,2) = 5! ÷ 3! = 120 ÷ 6 = 20 ordered arrangements.