Permutations & Combinations Calculator
Calculate permutations (nPr) and combinations (nCr) easily. Use permutations when order matters and combinations when order does not matter.
Permutation (nPr)
Combination (nCr)
Formulas Used
nPr = n! / (n − r)!
nCr = n! / [ r! (n − r)! ]
How to Use
- Enter the total number of items as n.
- Enter how many items are chosen as r.
- Click Calculate to see both nPr and nCr.
- Ensure that r ≤ n.