What is the difference between permutation and combination?
Permutations care about order (e.g. lock combinations). Combinations do not care about order (e.g. picking team members).
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Free Permutation & Combination Calculator | 1ClickTools
Calculate permutation & combination calculator instantly with Permutations [nPr = n! / (n - r)!] and Combinations [nCr = n! / (r!(n - r)!)]. Features.
Frequently Asked Questions
What is 0 factorial (0!)?
By mathematical definition, 0! = 1.
How accurate is the Permutation & Combination Calculator?
All calculations are executed using standard mathematical algorithms directly in client-side JavaScript, ensuring double-precision floating-point accuracy without server-side rounding discrepancies.
Is my input data kept private when using the Permutation & Combination Calculator?
Yes. 1ClickTools operates 100% locally in your web browser session. No personal data, financial values, or calculation inputs are ever uploaded, saved, or transmitted to any external servers.
Can I use this tool for commercial or academic projects?
Yes. 1ClickTools provides 100% free access for personal, academic, professional, and commercial use without subscription fees or usage caps.