Permutations (nPr)

Permutations (nPr) count the number of ordered arrangements of r items from n items. Order matters — ABC and BAC are different permutations of the same 3 letters

The calculator uses the standard published formula for permutations. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: P(n,r) = n! / (n−r)!. Each step in the calculation is shown so you can verify the result manually.