How to convert Fahrenheit to Kelvin
K = (°F + 459.67) × 5/9
Apply the operations in the order shown. This formula converts a Fahrenheit temperature reading to Kelvin, not a temperature difference. The source reading must be at least -459.67 °F, the absolute-zero limit.
Worked examples
32 °F ≈ 273.15 K
(32 + 459.67) × 5/9 ≈ 273.15
Water’s familiar freezing reference near standard atmospheric pressure.
212 °F ≈ 373.15 K
(212 + 459.67) × 5/9 ≈ 373.15
Water’s familiar boiling reference near standard atmospheric pressure; actual boiling temperature changes with pressure.
Frequently asked questions
Can I use °F to K for a temperature difference?
For an interval, use only the degree-size ratio and omit any offset. This calculator converts scale readings. Kelvin and Rankine start at absolute zero; Celsius and Fahrenheit have different zero points.