How this calculation works
Count ordered permutations and unordered combinations for n objects chosen r at a time. The result is calculated locally in your browser from the visible inputs, and the method below remains available for checking.
Worked example
Choosing 3 from 10 gives 120 combinations and 720 ordered permutations.
Assumptions and limits
- Inputs use the units shown beside each field.
- Intermediate values retain precision; displayed values are rounded for readability.
Questions people ask
How does the Permutation & Combination Calculator work?
It applies this displayed method: nPr = n! ÷ (n−r)!; nCr = n! ÷ (r!(n−r)!). Values stay in your browser and are not submitted to a server.
What should I check before using the Permutation & combination result?
Inputs use the units shown beside each field. Intermediate values retain precision; displayed values are rounded for readability. The result follows the displayed mathematical definition and the precision of the values entered.
Does this Permutation & combination calculator save my information?
No. Calculation inputs are processed on this device. Sharing creates a URL only when you choose the share action.