Cyclomatic Complexity Calculator for C
Measure the cyclomatic complexity of C functions, with a rating for each one. Free and private: runs in your browser.
Paste C source to score every function. Useful for embedded and safety-critical code where standards such as MISRA cap complexity.
Runs entirely in your browser. Nothing you paste is uploaded or stored.
Use cases
- Check a function before opening a pull request.
- Explain a review comment with numbers instead of opinions.
- Find the riskiest code to refactor first.
Frequently asked questions
Is there a complexity limit for safety-critical C?
Many embedded and safety standards (and HIS metrics) recommend keeping functions at or below 10–15.
Is the Cyclomatic Complexity Calculator for C free?
Yes. It is free with no sign-up, and it runs entirely in your browser, so your input is never uploaded or stored.
How accurate is a browser-based code check?
It uses fast heuristics on the snippet you paste, so it is great for quick feedback. For whole repositories, cross-file analysis and history, run a full CodeInspector scan.
Related tools
Track complexity, duplication and code smells across your whole codebase with CodeInspector.