Kelvins to degrees Fahrenheit
Type a value in kelvins 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 kelvins 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 = K × 1.8 − 459.67
Multiply by 1.8, then subtract 459.67, because the two scales have different zero points.
Example
To convert 25 K to degrees Fahrenheit: 25 × 1.8 − 459.67 = -414.67 °F.
Conversion table
| Kelvins (K) | Degrees Fahrenheit (°F) |
|---|---|
| -40 | -531.67 |
| -20 | -495.67 |
| -10 | -477.67 |
| 0 | -459.67 |
| 10 | -441.67 |
| 20 | -423.67 |
| 25 | -414.67 |
| 30 | -405.67 |
| 37 | -393.07 |
| 40 | -387.67 |
| 50 | -369.67 |
| 100 | -279.67 |
About the units
- 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.
- 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 kelvins in degrees Fahrenheit?
0 K = -459.67 °F. The formula is °F = K × 1.8 − 459.67.
How do I convert kelvins to degrees Fahrenheit?
Use °F = K × 1.8 − 459.67. For example, 25 K = -414.67 °F.
How many kelvins are in one degree Fahrenheit?
1 °F = 255.928 K.
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.