Conversion

Fahrenheit to Kelvin Converter

Convert degrees Fahrenheit to kelvin instantly with a simple, free calculator.

The result shows the same temperature on the Kelvin scale, the absolute temperature scale used in science.

Formula

Kelvin = (Fahrenheit − 32) × 5/9 + 273.15. The 32 shift aligns the freezing point of water, the 5/9 scales Fahrenheit degrees to Celsius degrees, and 273.15 shifts Celsius to Kelvin.

How it works

Enter a Fahrenheit temperature and the calculator converts it to Kelvin, the absolute temperature scale used in science. Results below absolute zero cannot occur in reality, so a very low input that gives a negative Kelvin value indicates an impossible temperature.

Worked example

For example, 32 °F gives (32 − 32) × 5 ÷ 9 + 273.15 = 273.15 K, the freezing point of water.

FAQs

Can Kelvin be negative?
No. Zero kelvin is absolute zero, the lowest possible temperature, so a real Kelvin reading is never negative.

Why is Kelvin used instead of Celsius in science?
Kelvin starts at absolute zero and has no negative values, which makes formulas for gas laws and thermodynamics simpler and avoids sign errors.

What is 32 °F in Kelvin?
32 °F is the freezing point of water, which equals 273.15 K.

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