Calculate combinations to find how many ways you can choose items from a larger set where order doesn't matter.
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Enter Your Measurements
Results
Combinations
120.00
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Formula
C(n,r) = n! / (r! × (n-r)!)
How to Use This Calculator
How to Use
- 1
Enter the total number of items (n).
- 2
Enter how many items you're choosing (r).
- 3
Click calculate.
Frequently Asked Questions
Frequently Asked Questions
When do I use combinations?
Use combinations when order doesn't matter. For example, choosing 3 people from a group of 10.
What's the difference between combinations and permutations?
In combinations, order doesn't matter (ABC = BAC). In permutations, order matters (ABC ≠ BAC).
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About This Calculator
This calculator uses the formula: C(n,r) = n! / (r! × (n-r)!). All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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