Fahrenheit to Kelvin Converter
Convert degrees Fahrenheit to kelvins instantly — with formula, examples and table.
Enter any number above and the result updates as you type. Everything runs locally in your browser, so it is instant and private.
Formula: K = (°F − 32) × 5/9 + 273.15. For example, 20 °F equals 266.48 K.
How to convert degrees Fahrenheit to kelvins
K = (°F − 32) × 5/9 + 273.15
Fahrenheit places freezing at 32° and boiling at 212°, giving 180 finer-grained degrees between them. It remains the everyday scale of the United States.
The kelvin starts at absolute zero (−273.15 °C), the coldest temperature physically possible. It is the SI base unit used throughout science.
Fahrenheit to Kelvin conversion table
| Fahrenheit (°F) | Kelvin (K) |
|---|---|
| -40 °F | 233.15 K |
| -30 °F | 238.7056 K |
| -20 °F | 244.2611 K |
| -10 °F | 249.8167 K |
| -5 °F | 252.5944 K |
| 0 °F | 255.3722 K |
| 5 °F | 258.15 K |
| 10 °F | 260.9278 K |
| 15 °F | 263.7056 K |
| 20 °F | 266.4833 K |
| 25 °F | 269.2611 K |
| 30 °F | 272.0389 K |
| 35 °F | 274.8167 K |
| 37 °F | 275.9278 K |
| 40 °F | 277.5944 K |
| 45 °F | 280.3722 K |
Need the opposite direction? Use the Kelvin to Fahrenheit converter, or read our complete guide to temperature conversions for every formula in one place.
Frequently asked questions
What is the formula to convert Fahrenheit to Kelvin?
K = (°F − 32) × 5/9 + 273.15. For example, 25 °F equals 269.26 K.
What is 100 °F in K?
100 °F equals 310.93 K, using the formula K = (°F − 32) × 5/9 + 273.15.
Is my data stored when I use this converter?
No. The conversion runs entirely in your browser with JavaScript — nothing you type is sent to a server, logged or stored.