Combination Calculator (nCr)

Calculate unordered combinations nCr = n! / (r! × (n - r)!) of selecting r items from n.

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 → 10

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

Current Limits

  • Maximum input length: 100,000 characters

Combination Calculator (nCr) 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 Combination Calculator (nCr)

  1. 1
    Enter Total Items (n)Type population count n.
  2. 2
    Enter Selected Count (r)Type number of items to pick r.
  3. 3
    Calculate CombinationsView exact nCr count.

Common Use Cases

  • Computing lottery ticket matching odds
  • Choosing committees or project teams from candidate pools
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