Temperature units
Each unit in K
| Unit | Symbol | In K | |
|---|---|---|---|
| kelvin | K | 1 | exact |
| degree Celsius | °C | (x + 273.15) | exact |
| degree Fahrenheit | °F | (x × 0.555 555 555 556 + 255.372 222 222) | exact |
| degree Rankine | °R | 0.555 555 555 556 | exact |
Temperature scales have different zeros, so they convert with an offset: °F = °C × 9/5 + 32, K = °C + 273.15, °R = K × 9/5.
Sources: SI Brochure (9th edition, 2019); NIST Special Publication 811 (2008), Appendix B; CODATA 2022 for the bohr, dalton, hartree and rydberg. Factors marked exact follow from the definitions of the units.