Life

Combination Permutation Calculator

Calculate permutations, combinations, repetition cases, and factorial from n and r.

Quick examples

Examples can be shared in the URL, but custom n and r values stay out of the link.

Total items nChosen items r

Calculate combinations and permutations

Enter n and r, or choose an example to see nPr, nCr, repetition cases, and n! together.

Permutation nPr = n! / (n-r)! · Combination nCr = n! / (r! x (n-r)!)

Permutation with repetition = n^r · Combination with repetition = C(n+r-1, r)

n and r are treated as non-negative integers. When r is greater than n, non-repeating permutation and combination results are 0.

Loading tool...

About Combination Permutation Calculator

Combination Permutation Calculator helps with quick Life workflows. Prepare the input, review the result, then copy or download it when the tool supports that next step.

Treat health, schedule, and everyday estimates as quick references, then verify current guidance for important decisions.

Do you store my input?

Most tool inputs are processed in your browser and are not stored.

Can I rely on the result?

Results are for quick reference. For legal, tax, or payroll decisions, verify current official rules.