How do I convert Fahrenheit to Kelvin?

Use the formula K = (°F − 32) × 5/9 + 273.15. First subtract 32 and scale to Celsius, then add 273.15 to reach the absolute Kelvin scale. For example, 32 °F = 273.15 K.

Is this converter accurate?

Yes. It applies the exact two-step relation (°F − 32) × 5/9 + 273.15 — note the additive offset, which makes temperature conversions non-proportional.

Is my data sent anywhere?

No. The converter is privacy-first — every calculation runs locally in your browser and nothing you type is transmitted or stored.

What is absolute zero in Fahrenheit and Kelvin?

Absolute zero is 0 K, which equals −459.67 °F. The Kelvin scale has no negative values.

Why does the Kelvin scale start at 273.15?

Kelvin starts at absolute zero, the coldest possible temperature. Water freezes at 273.15 K (0 °C) and boils at 373.15 K (100 °C), so the +273.15 term shifts the Celsius-based result onto the absolute scale.

What is room temperature in Kelvin?

A typical room temperature of 68 °F equals about 293.15 K (20 °C).

Fahrenheit to Kelvin Converter

Kelvin is the SI base unit of temperature and the standard scale in physics and chemistry, while Fahrenheit is the everyday scale in the United States. This free converter changes Fahrenheit (°F) into Kelvin (K) and back again — useful for science homework, lab work, and converting a US weather reading into absolute temperature.

How it works

The conversion is a two-step process. First the Fahrenheit value is scaled to Celsius with (°F − 32) × 5/9; then 273.15 is added to shift onto the absolute Kelvin scale, which starts at absolute zero rather than the freezing point of water. The full relation is:

K = (°F − 32) × 5/9 + 273.15

The additive offsets (−32 and +273.15) make the conversion non-proportional — doubling °F does not double K. Type a value in either field and the other updates instantly, in both directions.

Example

To convert 212 °F (boiling water): K = (212 − 32) × 5/9 + 273.15 = 100 + 273.15 = 373.15 K. To convert 32 °F (freezing): (32 − 32) × 5/9 + 273.15 = 273.15 K.

Fahrenheit (°F)	Kelvin (K)
−459.67 °F	0 K
32 °F	273.15 K
68 °F	293.15 K
98.6 °F	310.15 K
212 °F	373.15 K

All calculations run entirely in your browser — no data is sent to any server.