Rankine (°R)
The degree Rankine (°R) is an absolute temperature scale with Fahrenheit-sized degrees: 0 °R is absolute zero and water freezes at 491.67 °R.
Symbol: °R (ASCII: degR)
Quantity: thermodynamic temperature
SI relation: 1 °R = 0.5555555555556 K (exact)
Derivation: T(K) = T(°R) × 5/9; T(°R) = t(°F) + 459.67
Exact: yes, by definition
Typical uses
- US thermodynamics and gas-law calculations in inch-pound units
- Standard air (68 °F = 527.67 °R) and SCFM/ACFM corrections
- Rocket and turbine engineering in US units
Convert degrees Rankine to other units
| Conversion | 1 °R equals | Reverse |
|---|---|---|
| Rankine to Celsius | -272.5944444 °C | Celsius to Rankine |
| Rankine to Fahrenheit | -458.67 °F | Fahrenheit to Rankine |
| Rankine to Kelvin | 0.5555555556 K | Kelvin to Rankine |
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 Rankine (°R)".
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). Rankine (°R). Retrieved October 17, 2026, from https://scientificconverters.com/units/rankine/
IEEE
Scientific Converters, "Rankine (°R)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/rankine/