Temperature
Convert degree Fahrenheit (°F) to kelvin (K). Temperature scales are affine, not just scaled — converting requires an offset as well as a factor, which is why °C and °F don't share a zero.
1 °F = 255.9278 K
To convert degree Fahrenheit to kelvin, apply K = °F × 0.5555556 + 255.3722.
| °F | K |
|---|---|
| 1 | 255.9278 |
| 2 | 256.4833 |
| 5 | 258.15 |
| 10 | 260.9278 |
| 25 | 269.2611 |
| 50 | 283.15 |
| 100 | 310.9278 |
| 250 | 394.2611 |
| 500 | 533.15 |
| 1000 | 810.9278 |
Process temperatures are read in °C or °F; thermodynamic calculations use absolute K or °R.
A temperature difference is not the same as an absolute temperature: a 10 °C rise equals an 18 °F rise, but 10 °C does not equal 50 °F.
Worked example. A temperature of 302 °F is 423.15 K.
Use K = °F × 0.5555556 + 255.3722. Temperature scales are affine, so the conversion needs both a multiplier and an offset — unlike a simple unit factor.
1 °F equals 255.9278 K. Note that a temperature difference converts differently from an absolute temperature.
Process temperatures are read in °C or °F; thermodynamic calculations use absolute K or °R.