Convert Rankine to Kelvin
1 degree Rankine (°R) equals 0.5555555556 kelvins (K).
1 °R = 0.5555555556 K
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk Rankine to Kelvin converter to paste a column from Excel.
How to Convert Rankine to Kelvin
- 1 °R = 0.5555555556 K
- 1 K = 1.8 °R
- Example: convert 15 °R to K: 15 °R = 15 × 0.5555555556 K = 8.333333333 K
Formula
K = °R × 0.5555555555556
or K = °R ÷ 1.8
Derivation from SI units:
- T(K) = T(°R) × 5/9; T(°R) = t(°F) + 459.67
- SI base unit, fixed by the Boltzmann constant k = 1.380649 × 10⁻²³ J/K
Both units are defined exactly, so the factor is exact. Rankine definition: degree Rankine; Kelvin definition: kelvin.
Worked examples
- A reading of 491.67 °R converts to 273.15 K.
491.67 °R × 0.5555555556 = 273.15 K - A value of 800 °R is 444.4444444 K.
800 °R × 0.5555555556 = 444.4444444 K
Rankine to Kelvin conversion table
| Rankine (°R) | Kelvin (K) |
|---|---|
| 0 °R | 0 K |
| 100 °R | 55.55555556 K |
| 200 °R | 111.1111111 K |
| 459.67 °R | 255.3722222 K |
| 491.67 °R | 273.15 K |
| 518.67 °R | 288.15 K |
| 527.67 °R | 293.15 K |
| 559.67 °R | 310.9277778 K |
| 671.67 °R | 373.15 K |
| 800 °R | 444.4444444 K |
| 1000 °R | 555.5555556 K |
| 1500 °R | 833.3333333 K |
| 2000 °R | 1111.111111 K |
| 3000 °R | 1666.666667 K |
Where it's used
Rankine are used for US thermodynamics and gas-law calculations in inch-pound units, while kelvins appear in physics, chemistry and gas-law calculations (PV = nRT). Both measure thermodynamic temperature, so the conversion is a fixed factor.
Rankine to other temperature units
| Conversion | 1 °R equals |
|---|---|
| Rankine to Celsius | -272.5944444 °C |
| Rankine to Fahrenheit | -458.67 °F |
| Rankine to Kelvin | 0.5555555556 K |
Frequently asked questions
How many kelvins are in 1 degree Rankine?
1 °R = 0.5555555556 K.
How do I convert degrees Rankine to kelvins?
Multiply the value in °R by 0.5555555556, or divide it by 1.8. For example, 15 °R × 0.5555555556 = 8.333333333 K.
Is the °R to K conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Section 2.3.1, base unit definitions.
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). Convert Rankine to Kelvin. Retrieved October 17, 2026, from https://scientificconverters.com/temperature/rankine-to-kelvin/
IEEE
Scientific Converters, "Convert Rankine to Kelvin," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/temperature/rankine-to-kelvin/