Statistical calculators8 calculators
Updated on June 14, 2026
Calculate when to stop exploring and start committing with the 37% optimal stopping rule.
Calculate the coefficient of variation from a mean and a standard deviation — CV% = (σ ÷ μ) × 100.
Calculate the number of combinations C(n, r) — how many ways to choose r items from n when order does not matter, using C(n, r) = n! ÷ (r! × (n − r)!).
Calculate the margin of error for a proportion from the sample proportion p, the sample size n, and a z-score — MoE = z × √(p(1 − p) ÷ n) × 100.
Calculate the number of permutations P(n, r) — how many ways to arrange r items chosen from n when order matters, using P(n, r) = n! ÷ (n − r)!.
Calculate LIX, Flesch Reading Ease, and WSTF scores to evaluate text readability.
Calculate the standard error of the mean from standard deviation and sample size. Supports bidirectional solving.
Calculate a z-score from a raw value, the mean, and the standard deviation — z = (x − μ) ÷ σ.