Permutation Calculator (nPr)

Calculate the number of ordered arrangements nPr = n! / (n - r)! of r items from n items.

How It Works & Processing Standards

Enter values above to calculate results automatically. Check each input field for guidance and units.

Example: n=5, r=2 → 20

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 100,000 characters

Permutation Calculator (nPr) is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Permutation Calculator (nPr)

  1. 1
    Enter Total Items (n)Type population size n.
  2. 2
    Enter Selected Items (r)Type selection count r.
  3. 3
    View PermutationsInspect exact nPr calculation.

Common Use Cases

  • Calculating podium finishing order possibilities in a race
  • Estimating passcode combination search spaces
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