Convert Celsius to Rankine
Rankine = Celsius × 1.8 + 491.67. Type any temperature below to convert celsius to rankine both ways — it runs entirely in your browser.
Celsius to Rankine formula
Temperature scales have different zero points, so the conversion is a multiply-and-add, not a single ratio:
Rankine = Celsius × 1.8 + 491.67
To go the other way, Celsius = Rankine × 0.5555556 − 273.15.
Worked example
Convert 25 °C to rankine:
= 25 × 1.8 + 491.67 = 536.67 °R.
Common temperatures in Celsius and Rankine
| Reference point | Celsius (°C) | Rankine (°R) |
|---|---|---|
| Absolute zero | -273.15 | 0 |
| Freezing point of water | 0 | 491.67 |
| Refrigerator | 4 | 498.87 |
| Room temperature | 21 | 529.47 |
| Normal human body temperature | 37 | 558.27 |
| A hot summer day | 45 | 572.67 |
| Boiling point of water (sea level) | 100 | 671.67 |
About the Celsius and Rankine scales
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.
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.
Frequently asked questions
- What is 25 °C in Rankine?
- 25 °C = 536.67 °R.
- How do I convert Celsius to Rankine?
- Use rankine = celsius × 1.8 + 491.67. For example, 25 °C → 536.67 °R.
- How do I convert Rankine back to Celsius?
- Reverse it: celsius = rankine × 0.5555556 − 273.15.
- Why isn't converting Celsius to Rankine just multiplication?
- Because the two scales start their zero at different temperatures, so after scaling by 1.8 you also add 491.67. Skipping that constant is the most common temperature-conversion mistake.