What is the Permutations & Combinations tool?

Calculate P(n,r) and C(n,r). This free online tool is available at NumbersChecker with no login required.

Is the Permutations & Combinations tool free?

Yes, the Permutations & Combinations tool is completely free to use at NumbersChecker. No account or installation is needed — results are instant.

How do I use the Permutations & Combinations tool?

Enter your input into the form at https://numberschecker.com/tool/permutations, click Run, and the result appears instantly. Click any result value to copy it to your clipboard.

Is there an API for the Permutations & Combinations tool?

Yes. Send a POST request to https://numberschecker.com/api/permutations with your input as a JSON body. The API is free and requires no authentication.

Math nPrnCrcounting

Permutations & Combinations

Calculate P(n,r) and C(n,r).

About the Permutations & Combinations Tool

Calculate P(n,r) and C(n,r). This free online tool runs entirely in your browser — no login, no installation, and no data is stored.

This tool is part of the Math category on NumbersChecker. Browse all Math tools or explore all 139 tools.

Related: nPr · nCr · counting

API usage

POST /api/permutations
Content-Type: application/json

{
  "text": "your input here"
}