Degrees Rankine to kelvins
Type a value in degrees Rankine to see it in kelvins 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 kelvins as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
K = °R × 0.5555555556
Multiply the value in degrees Rankine by 0.5555555556 to get kelvins.
Example
To convert 25 °R to kelvins: 25 × 0.5555555556 = 13.8889 K.
Conversion table
| Degrees Rankine (°R) | Kelvins (K) |
|---|---|
| 1 | 0.555556 |
| 2 | 1.11111 |
| 3 | 1.66667 |
| 5 | 2.77778 |
| 10 | 5.55556 |
| 20 | 11.1111 |
| 25 | 13.8889 |
| 50 | 27.7778 |
| 100 | 55.5556 |
| 250 | 138.889 |
| 500 | 277.778 |
| 1,000 | 555.556 |
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.
- Kelvin
- The SI base unit of thermodynamic temperature, starting at absolute zero (0 K). Since 2019 it is defined by fixing the Boltzmann constant at 1.380649 × 10^-23 J/K.
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
How many kelvins are in one degree Rankine?
1 °R = 0.555556 K exactly.
How do I convert degrees Rankine to kelvins?
Use K = °R × 0.5555555556. For example, 25 °R = 13.8889 K.
How many degrees Rankine are in one kelvin?
1 K = 1.8 °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.