CalcWorkspace
CalculatorMath

Combinations Calculator

Count unordered selections without replacement. Choosing 3 from 10 gives 120 combinations. Uses integers with 0 ≤ r ≤ n ≤ 170.

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Method

How it works

Change any input above and the result updates instantly. The formula or method used by this tool is shown below.

nCr = n! / (r! × (n−r)!).

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About this tool

What does the Combinations Calculator do?+

Count unordered selections without replacement. Choosing 3 from 10 gives 120 combinations. Uses integers with 0 ≤ r ≤ n ≤ 170.

How does this calculator calculate the result?+

It uses this method: nCr = n! / (r! × (n−r)!).

Are my inputs saved or sent to an account?+

Core CalcWorkspace tools require no account, and most calculations run locally in your browser. Favorites and recent-tool history, when used, stay in this browser.