EngiRef / Temperature conversion
Convert Degrees Rankine to Degrees Celsius (°R to °C)
°C = °R × 0.555555556 - 273.15. Convert degrees Rankine to degrees Celsius with the exact formula, a common-values table and a free converter.
Conversion formula
°C = °R × 0.555555556 - 273.15
Temperature scales set their zero in different places, so this is an offset conversion, not a ratio. There is no single number you can multiply by: °R 0 is -273.15 °C, and doubling the input does not double the result. Apply the multiplier, then the offset, in that order.
°R to °C table
| Degrees Rankine (°R) | Degrees Celsius (°C) |
|---|---|
| 0 °R | -273.15 °C |
| 1 °R | -272.594444 °C |
| 2 °R | -272.038889 °C |
| 5 °R | -270.372222 °C |
| 10 °R | -267.594444 °C |
| 20 °R | -262.038889 °C |
| 50 °R | -245.372222 °C |
| 100 °R | -217.594444 °C |
Every figure is computed at build time by the site’s own converter from the temperature unit registry. For a value that is not listed, put it into the interactive converter.
Frequently asked questions
What is 1 °R in °C?
1 °R is -272.594444 °C. Because temperature scales are offset rather than proportional, this figure is not a multiplier: 100 °R is -217.594444 °C, not 100 times -272.594444.
What is the formula to convert degrees Rankine to degrees Celsius?
°C = °R × 0.555555556 - 273.15. Apply the multiplier first, then the offset. Every value in the table on this page is computed with that formula by the same converter the tool below runs.
How do I convert degrees Celsius back to degrees Rankine?
Use the inverse formula, °R = °C × 1.8 + 491.67. The °C to °R page carries the same table in that direction.