What is the Permutation Calculator (nPr)?

The Permutation Calculator determines how many different possible arrangements can be made when selecting r items from a total of n items, where the order of selection matters. It uses the standard permutation formula based on factorial operations to calculate the exact number of ordered arrangements. This tool is helpful for solving probability questions, arrangement problems, sequence creation, and other combinatorics-related tasks. After entering the values of n and r, the calculator instantly displays the number of permutations, allowing users to understand arrangement possibilities quickly and accurately.

How to Use:

1. Enter n: Type the total number of items.
2. Enter r: Enter how many items you want to arrange from the total.
3. Click “Calculate”: The calculator applies the permutation formula nPr = n! / (n − r)!
4. View Result: The number of possible ordered arrangements appears instantly.
5. Apply the Result: Use the output for probability solving, sequence analysis, or organizing arrangement-based problems.