Combination Calculator C(n,r)

Find the number of ways to choose r items from a set of n items where order does not matter.

Examples

When order does not matter?

Use combinations when only the set matters (e.g. choosing a committee).

Calculate permutations P(n,r) — arrangements where order matters.

Compute mean, median, mode, standard deviation, variance, min, max and more.

Convert a value to a standard score (z) and approximate percentile.

Calculate probability percentage and odds from favorable and total outcomes.

Compute a confidence interval for a mean from sample statistics.