Combinations Calculator
Ways to choose r of n, order ignored.
Enter the values and press Calculate.
How to use Combinations Calculator
Combinations count how many ways you can pick r items from n when order does not matter. This tool computes n choose r exactly.
Open Combinations Calculator on toolpermarket. It runs entirely in your browser, so you can start without creating an account.
Enter the total n and the number r to choose in the fields above, then press Calculate.
Read the result below the form. Change any input and run it again as many times as you like — the math is instant and local.
Worked example. Choosing 3 items from 10 gives 120 possible combinations.
When to use Combinations Calculator. Use it for lottery odds, team selection, or any unordered sampling problem.
Frequently asked questions
Is Combinations Calculator free to use?
Yes. Combinations Calculator runs entirely in your browser. There is no account, no upload, and no cost.
Does Combinations Calculator work on mobile?
Yes. The layout is responsive, so Combinations Calculator works on any phone, tablet, or desktop with a modern browser.
How is this different from permutations?
Combinations ignore order, so picking A then B is the same as B then A. Permutations count those as different.
What if r is larger than n?
That is impossible, so the tool reports an error. You cannot choose more items than exist.