Combination Calculator
Calculate the number of ways to choose r items from n items where order doesn't matter.
- Free Online Tool
- Instant Results
- Mobile Friendly
- No Installation
- Secure & Private
Understanding This Calculator
Combination Formula (nCr)
Selections where order does NOT matter.
C(n, r) = n! / [ r! × (n-r)! ]
Example 1
Choose 2 items from 5 (n=5, r=2)
- numer: 5! = 120
- denom: 2! × 3! = 2 × 6 = 12
- nCr = 120 / 12 = 10
Example 2
Choose 3 from 3 (n=3, r=3)
- C(3,3) = 1 (Only 1 way to choose all)
How to Use
- Enter total number of items.
- Enter how many to choose.
Frequently Asked Questions
How do I use the Combination Calculator (nCr)?
Enter your values in the input fields, and the result will appear instantly.
Is this calculator free to use?
Yes, this calculator is 100% free and does not require any registration or subscription.
Is it mobile-friendly?
Absolutely! Our tool is optimized for all devices, including mobile phones, tablets, and desktop computers.