Permutation Calculator (nPr)
Determine how many ways you can arrange r items from n items when order matters. Uses nPr = n! / (n-r)! for rankings and seating charts.
Permutations (nPr)
Enter values to calculate
How to Use the Permutation Calculator
1
Enter the total number of items (n).
2
Enter the number to arrange (r).
3
View the number of permutations.
Frequently Asked Questions
What is a permutation?
An ordered arrangement of items. nPr = n! / (n-r)! counts how many ways to arrange r items from n.
When to use permutations vs combinations?
Use permutations when order matters (rankings, passwords). Use combinations when order does not (groups).
What if r equals n?
nPn = n!, which is the total number of ways to arrange all n items.