Combinations with Repetition Calculator
Calculate multiset combinations C(n+r-1, r). Stars and bars visualization, full enumeration for small cases, distribution patterns, and reference tables.
Free Combinatorics Calculators
6 toolsCombinations, permutations, password complexity, and counting calculators. Browse our free combinatorics tools below — no sign-up required.
Combinations without Repetition Calculator
Calculate C(n, r) combinations without repetition. Full enumeration for small cases, Pascal's triangle row, probability of a specific combo, and reference table.
Password Combination Calculator
Calculate password combinations, entropy bits, and brute-force crack time. Compare password length and character set impacts on security strength.
Permutations with Repetition Calculator
Calculate ordered arrangements with repetition (n^r). Supports variable pool sizes per position, position breakdown, entropy, and reference tables.
Permutations without Repetition Calculator
Calculate P(n, r) ordered arrangements without repetition. Step-by-step position filling, full enumeration, comparison with combinations, and reference table.
Possible Combinations Calculator
Calculate all four types of counting: permutations/combinations with/without repetition. Decision guide, side-by-side comparison, visual size chart, and common examples.