Permutation Calculator

Calculate permutations (nPr) - the number of ways to arrange r items from n items where order matters

n (total number of items):

r (number of items to arrange):

A permutation is an arrangement of items from a collection where the order matters.

Formula: P(n,r) = n! / (n-r)!

Example: Arranging 3 items from 5 items (A,B,C,D,E): ABC is different from BCA or CAB.

Use permutations when order matters (e.g., passwords, race positions, seating arrangements).

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MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

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Formula Source: Standard Mathematical References

by Various

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.