Convert Rankine to Celsius
To convert degrees Rankine to degrees Celsius, use °C = °R × 0.5555555556 − 273.15: 15 °R = -264.8166667 °C, and 0 °R = -273.15 °C.
1 °R = -272.5944444 °C
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk Rankine to Celsius converter to paste a column from Excel.
How to Convert Rankine to Celsius
- 1 °R = -272.5944444 °C
- 1 °C = 493.47 °R
- Example: convert 15 °R to °C: 15 °R = (15 × 0.5555555556 − 273.15) °C = -264.8166667 °C
Formula
°C = °R × 0.5555555555556 − 273.15
Derivation from SI units:
- T(K) = T(°R) × 5/9; T(°R) = t(°F) + 459.67
- T(K) = t(°C) + 273.15 (exact, by definition)
- Solving for °C: °C = °R × 0.5555555555556 − 273.15
Both units are defined exactly, so the factor is exact. Rankine definition: degree Rankine; Celsius definition: degree Celsius.
Worked examples
- A reading of 491.67 °R converts to 0 °C.
491.67 × 0.5555555556 − 273.15 = 0 °C - A value of 800 °R is 171.2944444 °C.
800 × 0.5555555556 − 273.15 = 171.2944444 °C
Rankine to Celsius conversion table
| Rankine (°R) | Celsius (°C) |
|---|---|
| 0 °R | -273.15 °C |
| 100 °R | -217.5944444 °C |
| 200 °R | -162.0388889 °C |
| 459.67 °R | -17.77777778 °C |
| 491.67 °R | 0 °C |
| 518.67 °R | 15 °C |
| 527.67 °R | 20 °C |
| 559.67 °R | 37.77777778 °C |
| 671.67 °R | 100 °C |
| 800 °R | 171.2944444 °C |
| 1000 °R | 282.4055556 °C |
| 1500 °R | 560.1833333 °C |
| 2000 °R | 837.9611111 °C |
| 3000 °R | 1393.516667 °C |
Where it's used
Rankine are used for US thermodynamics and gas-law calculations in inch-pound units, while degrees Celsius appear in weather, cooking and body temperature in most countries. 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
What is the formula for degrees Rankine to degrees Celsius?
°C = °R × 0.5555555556 − 273.15. For example, 15 °R = -264.8166667 °C.
What is 0 °R in °C?
0 °R = -273.15 °C, and 100 °R = -217.5944444 °C.
How do I convert a temperature difference from °R to °C?
For a difference (an interval), ignore the offset and multiply by 0.5555555556 only: a change of 10 °R is a change of 5.555555556 °C.
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 and Table 4, degree Celsius.
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 Celsius. Retrieved October 17, 2026, from https://scientificconverters.com/temperature/rankine-to-celsius/
IEEE
Scientific Converters, "Convert Rankine to Celsius," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/temperature/rankine-to-celsius/