--- title: "21 °F to K = 267.0389 K" description: "21 degrees Fahrenheit is 267.0389 kelvin. The arithmetic, a table of nearby values, and a converter for any other number." url: https://atoneplace.net/convert/21-fahrenheit-to-kelvin/ site: "At One Place" --- # 21 °F to K **21 degrees Fahrenheit in kelvin: 21 °F = 267.0389 K** K = (°F + 459.67) × 5/9 21 degrees Fahrenheit is 267.0389 kelvin. To get there, use K = (°F + 459.67) × 5/9. ## Values either side *Degrees Fahrenheit near 21, converted to kelvin.* | Degrees Fahrenheit | Kelvin | | --- | --- | | 17 °F | 264.8167 | | 18 °F | 265.3722 | | 19 °F | 265.9278 | | 20 °F | 266.4833 | | 21 °F ← | 267.0389 | | 22 °F | 267.5944 | | 23 °F | 268.15 | | 24 °F | 268.7056 | | 25 °F | 269.2611 | ## How the conversion works The relationship is K = (°F + 459.67) × 5/9. Both units measure temperature, so the conversion is a fixed formula that never changes. Temperature scales are the one common case where converting is not just multiplication — Celsius and Fahrenheit each put their zero in a different place, so an offset is applied as well as a scale factor. ## Common questions ### What is 21 °F in kelvin? 21 °F is 267.0389 K. ### How do you convert degrees Fahrenheit to kelvin? Use K = (°F + 459.67) × 5/9. ## Related pages - [Degrees Fahrenheit to kelvin](https://atoneplace.net/convert/fahrenheit-to-kelvin/) - [21 K to °F](https://atoneplace.net/convert/21-kelvin-to-fahrenheit/) - [17 °F to K](https://atoneplace.net/convert/17-fahrenheit-to-kelvin/) - [18 °F to K](https://atoneplace.net/convert/18-fahrenheit-to-kelvin/) - [19 °F to K](https://atoneplace.net/convert/19-fahrenheit-to-kelvin/) - [20 °F to K](https://atoneplace.net/convert/20-fahrenheit-to-kelvin/) - [22 °F to K](https://atoneplace.net/convert/22-fahrenheit-to-kelvin/) - [23 °F to K](https://atoneplace.net/convert/23-fahrenheit-to-kelvin/) - [24 °F to K](https://atoneplace.net/convert/24-fahrenheit-to-kelvin/) - [25 °F to K](https://atoneplace.net/convert/25-fahrenheit-to-kelvin/) ## Sources - Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)] - The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure) - Calculated on this page — At One Place (/about/)