Fahrenheit (°F)
The degree Fahrenheit (°F) is a temperature scale on which water freezes at 32 °F and boils at 212 °F at standard pressure. One Fahrenheit degree is exactly 5/9 of a kelvin.
Symbol: °F (ASCII: degF)
Quantity: thermodynamic temperature
SI relation: T(K) = (t(°F) + 459.67) × 5/9; t(°F) = t(°C) × 9/5 + 32
Derivation: T(K) = (t(°F) + 459.67) × 5/9; t(°F) = t(°C) × 9/5 + 32
Exact: yes, by definition
History
Daniel Gabriel Fahrenheit introduced the scale in 1724. It is now defined from the kelvin: t(°F) = T(K) × 9/5 − 459.67.
Typical uses
- Weather and household temperatures in the United States
- US cooking and oven settings (350 °F ≈ 177 °C)
- HVAC design conditions and refrigeration in US practice
Convert degrees Fahrenheit to other units
| Conversion | 1 °F equals | Reverse |
|---|---|---|
| Fahrenheit to Celsius | -17.22222222 °C | Celsius to Fahrenheit |
| Fahrenheit to Kelvin | 255.9277778 K | Kelvin to Fahrenheit |
| Fahrenheit to Rankine | 460.67 °R | Rankine to Fahrenheit |
Open the Temperature Converter to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "degree Fahrenheit (°F)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Fahrenheit (°F). Retrieved October 17, 2026, from https://scientificconverters.com/units/fahrenheit/
IEEE
Scientific Converters, "Fahrenheit (°F)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/fahrenheit/