๐ขPermutation & Combination Calculator
Calculate nPr and nCr, with or without repetition, using exact arithmetic and full factorial working.
Calculations use exact BigInt arithmetic, so large factorials remain precise. Runs entirely in your browser.
Free Permutation and Combination Calculator
Need to calculate nPr or nCr for a probability or combinatorics problem? Our free permutation and combination calculator computes both instantly from n and r, with the full factorial working shown step by step.
Choose whether order matters (permutations) or doesn't (combinations), and whether repetition is allowed โ covering all four standard combinatorics formulas in one tool. Large values of n are handled precisely using exact arithmetic, so results stay accurate even when factorials get enormous, switching to scientific notation only when a number is too large to display in full.
Whether you're solving a lottery-odds problem, a seating arrangement, a password combination count, or a stats homework question, this tool gives you the exact answer with the formula and working shown. No sign-up, no downloads, completely free. See the About page or the FAQ for more.