Combination and Permutation Calculator
Calculate combinations C(n,r) and permutations P(n,r) exactly, including large integers.
How to use the tool
Enter the requested values and choose a mode or operation when needed. Fields start empty so results always reflect your own data.
For n=5 and r=2, there are 10 combinations and 20 permutations.
Formula and method
Combinations ignore order; permutations consider it. Results use exact integers.
C(n,r)=n!/[r!(n−r)!] · P(n,r)=n!/(n−r)!
Explore all math & statistics tools