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Permutation & Combination Calculator

Compute nPr and nCr exactly, with factorials and working shown.

P(n,r) — order matters

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C(n,r) — order ignored

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    What Is Permutation & Combination Calculator?

    The Permutation and Combination Calculator computes exact P(n,r) and C(n,r) values using BigInt arithmetic, so even enormous counts come out precisely. It shows the factorials involved and the formula with your numbers plugged in, making the difference between order-matters and order-ignored click.

    Who Uses the Permutation & Combination Calculator?

    Statistics students, lottery analysts, and interview preppers use it for counting problems where the numbers get big fast.

    How to Use the Permutation & Combination Calculator

    1. Enter n, the total number of items.
    2. Enter r, how many you choose.
    3. Read exact P(n,r) and C(n,r) with the working.

    Why Choose Our Permutation & Combination Calculator?

    • Exact BigInt results, no floating-point rounding
    • Factorials and formulas shown with your numbers
    • Handles r greater than n gracefully

    Try the Permutation & Combination Calculator above — it is free, fast, and works on any device. Bookmark this page to return whenever you need it.