Fahrenheit to Kelvin Converter
K = (°F + 459.67) × 5/9
Written without a degree sign: 300 K, not 300 °K.
1 degree Fahrenheit equals 255.928 kelvins
How to convert Fahrenheit to Kelvin
These formulas convert temperature readings. For a temperature difference, use only the scale factor: do not add or subtract the zero-point offset.
K = (°F + 459.67) × 5/9The addition of 459.67 aligns the two zero points, then multiplying by 5/9 converts the size of a degree.
293.15 K = (68 + 459.67) × 5/9Written without a degree sign: 300 K, not 300 °K.
Fahrenheit to Kelvin conversion table
Common values in degrees Fahrenheit, converted to kelvins.
| Degrees Fahrenheit (°F) | Kelvins (K) |
|---|---|
| -40 | 233.15 |
| -20 | 244.26111 |
| -10 | 249.81667 |
| 0 | 255.37222 |
| 10 | 260.92778 |
| 20 | 266.48333 |
| 25 | 269.26111 |
| 30 | 272.03889 |
| 37 | 275.92778 |
| 50 | 283.15 |
| 100 | 310.92778 |
Frequently asked questions
Is a change of 1 °F the same as a change of 1 K?
No. A change of 1 °F is a change of 0.555556 K. Apply only the scale factor to a temperature difference; the offset applies to temperature readings.
About these units
degree Fahrenheit°F
Water freezes at 32 °F and boils at 212 °F at standard atmospheric pressure. The everyday scale in the United States.
kelvinK
The SI base unit of thermodynamic temperature. Its zero is absolute zero, so kelvin values are never negative.
Reference: BIPM SI Brochure (9th ed.).
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.