Combinations Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
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Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the total items (n) and chosen (r).
- Press Calculate.
How it works
Combinations (nCr) count selections where order doesn't matter: n! ÷ (r! × (n − r)!).
Worked example
5C2. = 10.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.