Calculate permutations to find how many ways you can arrange items from a larger set where order matters.
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Results
Permutations
720.00
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Formula
P(n,r) = n! / (n-r)!
How to Use This Calculator
How to Use
- 1
Enter the total number of items (n).
- 2
Enter how many items you're arranging (r).
- 3
Click calculate.
Frequently Asked Questions
Frequently Asked Questions
When do I use permutations?
Use permutations when order matters. For example, the number of ways to arrange 3 people in a line from 10 people.
Is permutation always larger than combination?
Yes, permutation is always >= combination for the same n and r, because order matters in more arrangements.
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About This Calculator
This calculator uses the formula: P(n,r) = n! / (n-r)!. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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