Rankine to Celsius
( °R → °C )
Instantly convert Rankine to Celsius. Enter any value below and get an accurate result with the full formula and reference table.
How to Convert Rankine to Celsius
To convert Rankine to Celsius, subtract 491.67 from the Rankine temperature, then multiply by 5/9 (or 0.5556). This is because the Rankine scale is an absolute scale with the same degree size as Fahrenheit, and 0°C corresponds to 491.67°R.
Step-by-Step Example
Let’s convert 500°R to Celsius:
1. Subtract 491.67: 500 – 491.67 = 8.33
2. Multiply by 5/9: 8.33 × 5/9 = 4.63
3. So 500°R equals 4.63°C.
Another common example: 671.67°R (boiling point of water) → (671.67 – 491.67) × 5/9 = 180 × 5/9 = 100°C.
Note on Absolute Zero
Absolute zero is 0°R = -273.15°C. The Rankine scale is an absolute temperature scale used mainly in engineering thermodynamics, particularly in the United States.
When You’d Use Each Unit
Rankine is used in some engineering fields, especially when working with Fahrenheit-based absolute temperature calculations. Celsius is used worldwide for everyday temperatures and in science. Converting between them is useful in engineering and scientific contexts.
Common Rankine values converted to Celsius — typical values highlighted.
| Rankine (°R) | Celsius (°C) | Approximate |
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