Convert Kelvin to Fahrenheit
Convert Kelvin to Fahrenheit instantly. Formula, worked examples and a full reference table from -40° upward.
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Converting Kelvin to Fahrenheit is not a simple multiplication, because the two scales have different zero points as well as different degree sizes. The conversion needs both a scaling step and an offset.
Enter any temperature above and the result updates as you type. The formula and a reference table covering everyday temperatures follow below.
Kelvin to Fahrenheit formula
To go the other way, use K = (°F − 32) × 5/9 + 273.15.
About these units
Kelvin starts at absolute zero, the point where thermal motion stops. It uses Celsius-sized degrees and takes no degree symbol.
Fahrenheit puts water's freezing and boiling points at 32 and 212, giving 180 degrees between them. A Fahrenheit degree is therefore smaller than a Celsius one.
Kelvin to Fahrenheit conversion table
| 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 |
| 40 K | -387.67 °F |
| 50 K | -369.67 °F |
| 100 K | -279.67 °F |
Frequently asked questions
How many fahrenheits are in a kelvin? +
Temperature scales cannot be compared this way, because they do not share a zero point. Use the formula °F = (K − 273.15) × 9/5 + 32 instead.
What is 25 K in °F? +
25 K equals -414.67 °F. Apply the formula °F = (K − 273.15) × 9/5 + 32.
How do I convert fahrenheit back to kelvin? +
Use K = (°F − 32) × 5/9 + 273.15. The converter above handles both directions, or see our dedicated Fahrenheit to Kelvin page.