Degrees Rankine to degrees Fahrenheit
Type a value in degrees Rankine to see it in degrees Fahrenheit 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 Fahrenheit as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
°F = °R × 1 − 459.67
Multiply by 1, then subtract 459.67, because the two scales have different zero points.
Example
To convert 25 °R to degrees Fahrenheit: 25 × 1 − 459.67 = -434.67 °F.
Conversion table
| Degrees Rankine (°R) | Degrees Fahrenheit (°F) |
|---|---|
| -40 | -499.67 |
| -20 | -479.67 |
| -10 | -469.67 |
| 0 | -459.67 |
| 10 | -449.67 |
| 20 | -439.67 |
| 25 | -434.67 |
| 30 | -429.67 |
| 37 | -422.67 |
| 40 | -419.67 |
| 50 | -409.67 |
| 100 | -359.67 |
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 Fahrenheit
- The scale used in the United States, defined exactly by °F = °C × 9/5 + 32. Water freezes at 32 °F and boils at about 212 °F.
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 Fahrenheit?
0 °R = -459.67 °F. The formula is °F = °R × 1 − 459.67.
How do I convert degrees Rankine to degrees Fahrenheit?
Use °F = °R × 1 − 459.67. For example, 25 °R = -434.67 °F.
How many degrees Rankine are in one degree Fahrenheit?
1 °F = 460.67 °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.