Convert Rankine (°R) to Celsius (°C) instantly. Enter any value and get the result immediately.
°R → °C Converter
| Rankine (°R) | Celsius (°C) |
|---|---|
| 0.1 °R | -273.09444444 °C |
| 0.5 °R | -272.87222222 °C |
| 1 °R | -272.59444444 °C |
| 2 °R | -272.03888889 °C |
| 5 °R | -270.37222222 °C |
| 10 °R | -267.59444444 °C |
| 20 °R | -262.03888889 °C |
| 50 °R | -245.37222222 °C |
| 100 °R | -217.59444444 °C |
| 200 °R | -162.03888889 °C |
| 500 °R | 4.62777778 °C |
| 1000 °R | 282.40555556 °C |
| 5000 °R | 2504.62777778 °C |
| 10000 °R | 5282.40555556 °C |
The formula to convert Rankine (°R) to Celsius (°C) is:
Alternative formula — via Kelvin:
Step-by-step example — Convert 671.67°R to °C:
More examples:
Rankine (°R) is an absolute temperature scale proposed by Scottish engineer William John Macquorn Rankine in 1859. It starts at absolute zero (0°R = -273.15°C) — the coldest possible temperature in the universe. Rankine uses Fahrenheit-sized degrees, making it the Fahrenheit equivalent of Kelvin.
Rankine is primarily used in US engineering thermodynamics — especially in aerospace, HVAC systems, and steam power plants. The famous Rankine Cycle used in steam turbines is named after the same scientist.
Celsius (°C) is the most widely used temperature scale worldwide and part of the metric system. Developed by Swedish astronomer Anders Celsius in 1742, it defines 0°C as the freezing point and 100°C as the boiling point of water at standard atmospheric pressure. It is used in India, Europe, and almost every country except the USA for everyday temperature.
| Rankine (°R) | Celsius (°C) | Reference Point |
|---|---|---|
| 0 °R | -273.15 °C | Absolute zero |
| 7.2 °R | -269.15 °C | Liquid helium temperature |
| 138.6 °R | -196.15 °C | Liquid nitrogen temperature |
| 419.67 °R | -40 °C | Equal point of °C and °F |
| 459.67 °R | -17.78 °C | 0°F (Fahrenheit zero) |
| 491.67 °R | 0 °C | Freezing point of water |
| 527.67 °R | 20 °C | Room temperature |
| 558.27 °R | 37 °C | Normal body temperature |
| 559.67 °R | 37.78 °C | Mild fever (100°F) |
| 671.67 °R | 100 °C | Boiling point of water |
| 1459.67 °R | 537.78 °C | 1000°F reference |
| Feature | Rankine (°R) | Celsius (°C) |
|---|---|---|
| Type | Absolute scale | Relative scale |
| Zero point | Absolute zero | Freezing point of water |
| Degree size | Same as Fahrenheit | Same as Kelvin |
| Absolute zero | 0 °R | -273.15 °C |
| Freezing point of water | 491.67 °R | 0 °C |
| Boiling point of water | 671.67 °R | 100 °C |
| Can be negative? | No | Yes |
| Primary use | US Engineering | Daily life worldwide |
The formula is: °C = (°R − 491.67) × 5/9. Subtract 491.67 from Rankine, then multiply by 5/9. Example: 671.67°R → (671.67 − 491.67) × 5/9 = 100°C.
491.67°R = 0°C. This is the freezing point of water — a key reference point when converting between these two scales.
671.67°R = 100°C. This is the boiling point of water at sea level. Formula: (671.67 − 491.67) × 5/9 = 100°C.
0°R = -273.15°C. This is absolute zero — the theoretically coldest possible temperature in the universe where all molecular motion stops.
558.27°R = 37°C. This is the normal human body temperature — commonly used in biology, medicine, and physiology.
Rankine is used primarily in US engineering thermodynamics — aerospace engineering, HVAC systems, and steam power plant calculations. Most scientific work worldwide uses Kelvin instead.