Convert Rankine to Celsius
Celsius = Rankine × 0.5555556 − 273.15. Type any temperature below to convert rankine to celsius both ways — it runs entirely in your browser.
Rankine to Celsius formula
Temperature scales have different zero points, so the conversion is a multiply-and-add, not a single ratio:
Celsius = Rankine × 0.5555556 − 273.15
To go the other way, Rankine = Celsius × 1.8 + 491.67.
Worked example
Convert 540 °R to celsius:
= 540 × 0.5555556 − 273.15 = 26.85 °C.
Common temperatures in Rankine and Celsius
| Reference point | Rankine (°R) | Celsius (°C) |
|---|---|---|
| Absolute zero | 0 | -273.15 |
| Freezing point of water | 491.67 | 0 |
| Refrigerator | 498.87 | 4 |
| Room temperature | 529.47 | 21 |
| Normal human body temperature | 558.27 | 37 |
| A hot summer day | 572.67 | 45 |
| Boiling point of water (sea level) | 671.67 | 100 |
About the Rankine and Celsius scales
Rankine: The Rankine scale starts at absolute zero like Kelvin but uses the Fahrenheit-sized degree (0 °R = −459.67 °F). It appears in some US engineering and thermodynamics work.
Celsius: Celsius (centigrade) puts 0° at the freezing point of water and 100° at its boiling point at sea level. It is the everyday temperature scale used almost everywhere outside the United States.
Frequently asked questions
- What is 540 °R in Celsius?
- 540 °R = 26.85 °C.
- How do I convert Rankine to Celsius?
- Use celsius = rankine × 0.5555556 − 273.15. For example, 540 °R → 26.85 °C.
- How do I convert Celsius back to Rankine?
- Reverse it: rankine = celsius × 1.8 + 491.67.
- Why isn't converting Rankine to Celsius just multiplication?
- Because the two scales start their zero at different temperatures, so after scaling by 0.5555556 you also subtract 273.15. Skipping that constant is the most common temperature-conversion mistake.