Compute P(n, r) and C(n, r) with exact values and clear steps.
Use non-negative integers where n is greater than or equal to r.
Enter n and r to view permutation, combination, and formula steps.
Permutation and combination formulas are expanded below.
This calculator helps you solve P(n, r) and C(n, r) using the standard permutation and combination formulas.
It shows exact browser-side results with expanded steps, so you can understand both ordered arrangements and unordered selections.
The calculation runs directly in your browser without WordPress REST gateways, n8n webhooks, or external workflow calls.
Calculate P(n, r) and C(n, r) with exact results, formulas, step-by-step working, and share tools.
This mathematics calculators page is designed for quick checks, planning, and everyday decision support without forcing users through a heavy workflow.
Enter the required values in the calculator above, review any optional settings, and run the calculation. Check the result summary and reset the form when you want to try a different scenario.
For important decisions, compare the output with your own records and professional guidance where needed.
Permutation P(n, r) = n! / (n - r)!. Combination C(n, r) = n! / (r! x (n - r)!).
Example: choose n = 5 and r = 2 to compare ordered selections with unordered selections.
Explore practical math utilities designed for quick checks, classroom support, and clean numerical workflows.
Last updated: May 10, 2026
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Yes. The Permutation & Combination Calculator is free to use in your browser.
No. Treat calculator output as an estimate and verify important finance, medical, tax, legal, or compliance decisions with a qualified professional.
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