Permutation and Combination Calculator
Count ordered and unordered selections from a set.
Permutation and Combination Calculator
How it works
Count ordered and unordered selections from a set.
Formula and method
P(n,r) = n! ÷ (n−r)! counts ordered choices. C(n,r) = n! ÷ (r!(n−r)!) ignores order.
When to use it
Enter values to check homework, verify a manual calculation, compare examples, or explore how each input changes the answer. Results update instantly, but you should still choose units and interpret the result in the context of your problem.
FAQ
How it works?
P(n,r) = n! ÷ (n−r)! counts ordered choices. C(n,r) = n! ÷ (r!(n−r)!) ignores order.
Can I use decimal values?
Enter values to check homework, verify a manual calculation, compare examples, or explore how each input changes the answer. Results update instantly, but you should still choose units and interpret the result in the context of your problem.