Combination Calculator

Calculate combinations (nCr) - the number of ways to choose r items from n items without regard to order

n (total number of items):

r (number of items to choose):

A combination is a selection of items from a collection where the order does not matter.

Formula: C(n,r) = n! / (r! × (n-r)!)

Example: Choosing 3 items from 5 items (A,B,C,D,E): ABC is the same as BCA or CAB.

Use combinations when order doesn't matter (e.g., lottery numbers, committee selection).

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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.