Kelvin to Fahrenheit
One K equals -457.87 °F. Type any number and the answer appears as you type — the maths happens in your browser.
The same value in every unit
| Unit | Value |
|---|
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Common values
| Kelvin | Fahrenheit |
|---|---|
| -40 K | -531.67 °F |
| -20 K | -495.67 °F |
| -10 K | -477.67 °F |
| 0 K | -459.67 °F |
| 10 K | -441.67 °F |
| 20 K | -423.67 °F |
| 25 K | -414.67 °F |
| 30 K | -405.67 °F |
| 37 K | -393.07 °F |
| 50 K | -369.67 °F |
| 100 K | -279.67 °F |
| 200 K | -99.67 °F |
How to use
- Enter the number of Kelvin in the field.
- The result in Fahrenheit updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: °F = (K − 273.15) × 9/5 + 32. Going back the other way, one °F is 255.9277778 K.
Why you cannot just multiply
Celsius, Fahrenheit and Kelvin start counting from different points, so a temperature is converted with a formula rather than a factor. That is why −40 is the same number in Celsius and Fahrenheit, and why a difference between two temperatures converts differently from a temperature itself.
°F = (K − 273.15) × 9/5 + 32
Frequently asked questions
How many Fahrenheit are in one Kelvin?
One K is -457.87 °F.
How do I convert Kelvin to Fahrenheit?
Multiply by the factor: °F = (K − 273.15) × 9/5 + 32.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert Fahrenheit back to Kelvin?
One °F is 255.9277778 K — or open the reverse page linked below.