# Stellar Temperature Calculator

> Stellar temperature calculator: estimate a star's surface temperature and spectral class from its color index. Free, private, runs locally, no signup.

- **Canonical URL:** https://boringtoolskit.com/stellar-temperature-calculator/
- **Category:** Astronomy
- **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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*Local planning estimate. Verify current terms, rates, and policies before acting.*