# Law of Cosines Calculator

> Law of cosines calculator: solve any triangle side or angle from three known values, with working steps included. Free, private, runs in your browser.

- **Canonical URL:** https://boringtoolskit.com/law-of-cosines-calculator/
- **Category:** Everyday Calculators
- **Evidence level:** catalogue
- **Reviewed:** July 26, 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

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