Fahrenheit to kelvin converter
Convertersconversion pair
Convert fahrenheit to kelvin instantly: (°F + 459.67) × 5/9. Science the cold way round, with the exact formula and a copy button.
0 °F is 255.37 K — the offset that makes absolute zero look reasonable.
work surface
Math, not advice — results are indicative. Read the disclaimer.
pro tips
Add 459.67 first, then multiply by 5/9 — same answer, clearer absolute zero.
32 °F is 273.15 K and 212 °F is 373.15 K. Water behaves identically in both.
Kelvin has no degree symbol and no negatives; get one and you've gone the wrong way.
what it does
Fahrenheit to kelvin goes through two ideas in one: first turn the reading absolute, then land it on the kelvin scale. The formula is °F × 5/9 + 255.372, or more plainly (°F + 459.67) × 5/9 if you like to watch absolute zero appear.
It shows up in labs and astronomy where a reading arrives in fahrenheit but the equations demand kelvin, in cryogenics where specs are given in both, in American engineering reports crossing into metric science, and in any context where fahrenheit's zero is a comfort and kelvin's zero is physics.
The shortcut: −459.67 °F is absolute zero, 32 °F is 273.15 K (freezing), 212 °F is 373.15 K (boiling), and a 70 °F room is about 294 K. Kelvin is never negative, so any fahrenheit below −459.67 doesn't exist.
Type any fahrenheit value and the widget answers in kelvin instantly, with the math in the hint. Click to copy, and swap when a kelvin figure has to come back to fahrenheit.
quick answers
How do I convert fahrenheit to kelvin?
(°F + 459.67) × 5/9, or °F × 0.5556 + 255.372. Same number, two routes.
Is 0 °F absolute zero?
No — 0 °F is 255.37 K. Absolute zero is −459.67 °F.
Why convert fahrenheit straight to kelvin?
Because some labs receive fahrenheit data but publish in kelvin, and going through celsius adds a step and a rounding.