Degrees Fahrenheit to degrees Rankine
Type a value in degrees Fahrenheit to see it in degrees Rankine 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 Fahrenheit box.
- Read the result in degrees Rankine as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
°R = °F × 1 + 459.67
Multiply by 1, then add 459.67, because the two scales have different zero points.
Example
To convert 25 °F to degrees Rankine: 25 × 1 + 459.67 = 484.67 °R.
Conversion table
| Degrees Fahrenheit (°F) | Degrees Rankine (°R) |
|---|---|
| -40 | 419.67 |
| -20 | 439.67 |
| -10 | 449.67 |
| 0 | 459.67 |
| 10 | 469.67 |
| 20 | 479.67 |
| 25 | 484.67 |
| 30 | 489.67 |
| 37 | 496.67 |
| 40 | 499.67 |
| 50 | 509.67 |
| 100 | 559.67 |
About the units
- 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.
- 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.
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 Fahrenheit in degrees Rankine?
0 °F = 459.67 °R. The formula is °R = °F × 1 + 459.67.
How do I convert degrees Fahrenheit to degrees Rankine?
Use °R = °F × 1 + 459.67. For example, 25 °F = 484.67 °R.
How many degrees Fahrenheit are in one degree Rankine?
1 °R = -458.67 °F.
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.