Combinations (nCr)
Calculate Combinations (nCr) instantly with the exact formula and a worked example. Free online calculator — no signup, works on mobile.
Combinations (nCr)
n
r
C(n,r)
120
More about: Combinations (nCr)
What it calculates
The “Combinations (nCr)” calculator computes C(n,r) from 2 parameters: n, r.
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters n = 10, r = 3 the result is 120.
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.