Degrees Rankine to degrees Celsius
Type a value in degrees Rankine to see it in degrees Celsius straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the degrees Rankine box.
- Read the result in degrees Celsius as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
°C = °R × 0.5555555556 − 273.15
Multiply by 0.5555555556, then subtract 273.15, because the two scales have different zero points.
Example
To convert 25 °R to degrees Celsius: 25 × 0.5555555556 − 273.15 = -259.261 °C.
Conversion table
| Degrees Rankine (°R) | Degrees Celsius (°C) |
|---|---|
| -40 | -295.372 |
| -20 | -284.261 |
| -10 | -278.706 |
| 0 | -273.15 |
| 10 | -267.594 |
| 20 | -262.039 |
| 25 | -259.261 |
| 30 | -256.483 |
| 37 | -252.594 |
| 40 | -250.928 |
| 50 | -245.372 |
| 100 | -217.594 |
About the units
- Degree Rankine
- An absolute scale that starts at absolute zero with Fahrenheit-sized degrees, so °R = K × 9/5 exactly. It appears in some US thermal engineering work.
- Degree Celsius
- A degree Celsius is the same size as a kelvin, but the scale is shifted so that K = °C + 273.15 exactly. Water freezes at 0 °C and boils at about 100 °C at standard pressure.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
What is 0 degrees Rankine in degrees Celsius?
0 °R = -273.15 °C. The formula is °C = °R × 0.5555555556 − 273.15.
How do I convert degrees Rankine to degrees Celsius?
Use °C = °R × 0.5555555556 − 273.15. For example, 25 °R = -259.261 °C.
How many degrees Rankine are in one degree Celsius?
1 °C = 493.47 °R.
Why is temperature conversion not a simple multiplication?
Celsius and Fahrenheit do not start at absolute zero, so converting needs an offset as well as a factor. For example °F = °C × 9/5 + 32, which is why 0 °C is 32 °F, not 0.
At what temperature are Celsius and Fahrenheit equal?
At minus 40: -40 °C is exactly -40 °F.