Combinations and Permutations Calculator
Count ways to choose or arrange items.
How it works
Combinations = n! ÷ (r!(n − r)!). Permutations = n! ÷ (n − r)!.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.