Compute nCr combinations and nPr permutations with factorial steps shown. Count 5-card poker hands (2,598,960) correctly — free, local, no signup.
Compute simple probability as favorable outcomes divided by total outcomes — coin flips, dice rolls, card draws. See 3 in 10 read as 30.0% instantly — free, local, no signup.
Find the greatest common factor (GCF/GCD) of number sets via Euclidean algorithm with steps. Reduce 48:180 to 4:15 correctly — free, local, no signup.
Compute logarithms (logs) in any base with change-of-base steps and natural/common presets. Solve log₂(32) = 5 instantly — free, local, no signup.
Compute turnover rate and retention with replacement-cost breakdown. Price a 20% churn problem correctly — free, local, no signup.
Compute next semantic versions from change types — breaking bumps major automatically. Tag v2.4.1 correctly after that breaking fix — local logic, free, no signup.
2,598,960 = C(52,5) — order doesn't matter in poker, so combinations apply. Permutations would overcount 120x.
Order matters → permutations (P); order irrelevant → combinations (C). Teams and hands use C; passwords and rankings use P.
Exact integers into the millions; beyond that scientific notation with full precision preserved.
No — math runs locally in your browser. Numbers never leave your device.
Permutation Calculator
Calculate the number of ways to arrange k items from n items (nPr). Shows the step-by-step permutation calculation. Numbers never leave your device — every calculation runs locally in your browser.
Factorial Calculator
Calculate the factorial of any number (n!). Handles large numbers and shows the full multiplication sequence. Numbers never leave your device — every calculation runs locally in your browser.
Last updated October 2026