Permutation Calculator: nPr (Ordered Arrangements)By Daniel Sir / September 13, 2026 Permutation Calculator nPr = n! / (n-r)! | Order matters n (total items):r (items to arrange):Calculate nPr Result P(n,r) = P(,) = Note: Permutations count different orderings. nPr ≥ nCr when r > 0.