°F to K conversion line
The straight line maps any Fahrenheit reading to Kelvin. The red dot is your value; the smaller dots mark freezing, room, body and boiling temperatures.
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Temperature
Fahrenheit to Kelvin Converter
Convert Fahrenheit (°F) to Kelvin (K) instantly, with the exact two-step formula, a full equivalents readout and a conversion chart. Built for science homework, lab reports and engineering.
Result
310.15 K
How to convert Fahrenheit to Kelvin
Kelvin uses the same degree size as Celsius but starts at absolute zero. So converting from Fahrenheit is a two-step move: first turn Fahrenheit into Celsius, then add 273.15 to shift onto the absolute Kelvin scale.
K = (°F − 32) × 5/9 + 273.15
K = (°F + 459.67) × 5/9
K = (°F + 459.67) × 5/9
Worked example
Convert a room reading of 72°F. First (72 − 32) × 5/9 = 22.22°C, then add 273.15: 22.22 + 273.15 = 295.37 K.
Good to know
Kelvin values are written without a degree symbol (295 K, not 295°K) and can never be negative, because 0 K is the coldest temperature physically possible.
Fahrenheit to Kelvin reference table
| Fahrenheit | Kelvin | Where you see it |
|---|---|---|
| −459.67°F | 0 K | Absolute zero |
| 0°F | 255.37 K | Bitter cold snap |
| 32°F | 273.15 K | Water freezes |
| 68°F | 293.15 K | Room temperature |
| 98.6°F | 310.15 K | Body temperature |
| 212°F | 373.15 K | Water boils |
Reference temperatures in Fahrenheit and kelvin
Converting from Fahrenheit takes two steps because the scales differ in both zero point and degree size: subtract 32 and multiply by 5/9 to get Celsius, then add 273.15. US engineers sometimes use the Rankine scale instead, which starts at absolute zero but uses Fahrenheit-sized degrees (°R = °F + 459.67).
| Reference point | Fahrenheit → kelvin |
|---|---|
| Absolute zero | -459.67 °F = 0 K |
| Water freezes | 32 °F = 273.15 K |
| Room temperature | 68 °F = 293.15 K |
| Normal body temperature | 98.6 °F = 310.15 K |
| Water boils (sea level) | 212 °F = 373.15 K |
| Oven, moderate | 356 °F = 453.15 K |
Frequently asked questions
How do I convert Fahrenheit to Kelvin?
Subtract 32, multiply by 5/9, then add 273.15. For 32°F, (32 − 32) × 5/9 + 273.15 = 273.15 K.
What is 98.6°F in Kelvin?
About 310.15 K, from (98.6 − 32) × 5/9 + 273.15.
Why does Kelvin add 273.15?
Kelvin starts at absolute zero, which is 273.15 degrees below the Celsius freezing point of water, so the offset shifts a Celsius-scaled value onto the Kelvin scale.
Can Kelvin be negative?
No. Kelvin begins at 0 K (absolute zero), so its temperatures are never negative.
What is absolute zero in Fahrenheit?
0 K equals −459.67°F, the lowest temperature that can exist.
Do I write °K or K?
Just K. The kelvin is an SI base unit and, unlike Fahrenheit and Celsius, does not take a degree symbol.
What is 32 °F in kelvin?
273.15 K, the freezing point of water.
What is absolute zero in Fahrenheit?
−459.67 °F, which is 0 K.
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