This free temperature converter changes Celsius (°C) into Rankine (°Ra) and back, instantly and in your browser. Rankine is an absolute temperature scale — its zero is absolute zero — but it uses Fahrenheit-sized degrees, which makes it useful in some US engineering and thermodynamics calculations.
How it works
Rankine combines two ideas: the absolute zero reference of Kelvin and the degree size of Fahrenheit. Converting from Celsius means scaling by 1.8 (to switch to Fahrenheit-sized degrees) and adding the offset that shifts the zero to absolute zero:
°Ra = °C × 1.8 + 491.67
This is equivalent to (°C + 273.15) × 9/5. To reverse it, subtract 491.67 and divide by 1.8: °C = (°Ra − 491.67) ÷ 1.8. The additive offset makes the conversion non-proportional, unlike length or mass.
Example
Convert 0 °C (freezing point of water) to Rankine:
0 × 1.8 + 491.67 = 491.67 °Ra
| Celsius (°C) | Rankine (°Ra) |
|---|---|
| 0 °C | 491.67 °Ra |
| 20 °C | 527.67 °Ra |
| 37 °C | 558.27 °Ra |
| 100 °C | 671.67 °Ra |
All calculations run entirely in your browser with no data sent to any server.