CalcPermutations Calculator
Last updated: 2026-08-24
Permutations Calculator — Calculate permutations of n items taken r at a time.
Inputs
Result
Enter values and press Calculate
Was this helpful?
How to use it
- Total n = 8, selecting r = 3
- Apply formula: P(8,3) = 8 × 7 × 6
- Calculate: 8 × 7 = 56
- Result: 56 × 6 = 336 permutations
Common mistakes
- ⚠️ Using combinations formula instead of permutations
- ⚠️ Allowing r > n which giv is invalid results
- ⚠️ Confusing when order matters vs doesn't matter
Worked example
Calculate P(10,3) = 720.
The permutations {perm} count the number of ways to arrange r items from n when order matters.
Input guide
| Field | Typical range |
|---|---|
| r | Selected items: 1 to n |
| n | Total items: 1 to 100 |