Free 100% In-Browser Tool

Permutation (nPr) & Combination (nCr)

Compute permutations (nPr) and combinations (nCr) with step-by-step factorials.

Quick Answer:Enter total items (n) and sample subset size (r) to calculate total permutations (nPr) and combinations (nCr).

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How to Use the Permutation & Combination

Permutations: nPr = n! / (n - r)!; Combinations: nCr = n! / [r! * (n - r)!]

Mathematical formula, algorithm, or standardized processing method.

Input: Default standard parameters and high-quality inputs

Explanation: Processes calculations or media manipulation according to standard specifications.

Result: Exact calculated values and verified output

Is this tool completely free to use?▼

Yes, 100% free with unlimited calculations and instant downloads.

Does this tool work on mobile devices?▼

Yes, Toolzy is fully responsive on iOS, Android, tablets, and desktop browsers.

Are my files uploaded or stored on any server?▼

No, calculations and media manipulations run entirely within your web browser.

How accurate are the mathematical formulas?▼

All tools use standardized engineering formulas, building codes, and exact decimal arithmetic.

•Entering zero divisors, negative dimensions, or mixing metric and imperial units.
•Expecting lower energy rates during peak demand utility billing periods.

•Managing residential power bills, estimating construction materials, and trade budgeting.
•Generating authentic creative worldbuilding assets for fiction and game design.

Last reviewed & updated: 2026-11-12

Free & Open Access

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