Factorials, Permutations and Combinations Calculator
This calculator provides a quick and easy means of computing factorials, permutations, and combinations.


  1. Click the tab to select which calculation you need (factorials/permutations/combinations).
  2. The window displays the formula that you're evaluating. Enter the parameters n and r (just enter n for factorials) and press "OK".
  3. The result appears below in the window.