Math Calculators

Combination Calculator – nCr Calculator

Calculate combinations (nCr). Find ways to choose r items from n items where order does not matter.

Total Items (n)

Items to Choose (r)

Combination Calculator Formula

nCr = n! / (r! × (n−r)!)

Combinations count selections where order doesn't matter.

5C3 = 5! / (3! × 2!) = 120 / (6 × 2) = 10

What is a combination?

Calculate permutations (nPr). Find the number of ways to arrange r items from n items where order matters.

Calculate the probability of events. Find single event probability and combined event probabilities.

Calculate percentages easily. Find what percent one number is of another, or calculate the percentage of a number.