Fahrenheit to Kelvin Converter
Two-way converter: change Fahrenheit to Kelvin or Kelvin to Fahrenheit in one step.
Type a value in either field for an instant conversion
About converting Fahrenheit and Kelvin
Fahrenheit is the US everyday temperature scale; Kelvin is the SI base unit used in science. Direct Fahrenheit → Kelvin conversion is needed when working with US-spec lab data or thermophysics calculations that require absolute temperature.
To convert Fahrenheit to Kelvin, use the formula: K = (°F − 32) × 5/9 + 273.15. The reverse formula handles the other direction automatically — type into either field.
Every calculation runs locally in your browser and updates instantly — nothing is uploaded, and the result appears the moment you type.
Why use this converter
Works both ways
Convert °F to K or K to °F by typing in either field.
Exact formula
Uses the standard temperature conversion formula with no shortcuts.
No install
Runs in any browser on phone or desktop, with no sign-up required.
Frequently asked questions
How do I convert Fahrenheit to Kelvin?
Subtract 32, multiply by 5/9, then add 273.15. For example, 100 °F = (100 − 32) × 5/9 + 273.15 ≈ 310.93 K.
What is 32 °F in Kelvin?
32 °F = 273.15 K — the freezing point of water.
What is absolute zero in Fahrenheit?
Absolute zero is 0 K, which equals −459.67 °F.
What is room temperature in Kelvin?
70 °F ≈ 294.26 K — typical room temperature.
Can the result be negative?
No. Kelvin starts at 0, so the converted result is always non-negative. Negative Fahrenheit inputs give positive Kelvin values.