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

°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.

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

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

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.