Kelvin to Fahrenheit Converter
Two-way converter: change Kelvin to Fahrenheit or Fahrenheit to Kelvin in one step.
Type a value in either field for an instant conversion
About converting Kelvin and Fahrenheit
Kelvin is the SI base unit of thermodynamic temperature. Fahrenheit is the everyday scale in the United States. Converting Kelvin to Fahrenheit is helpful when presenting scientific data to an American audience or comparing lab numbers to US weather and oven specs.
To convert Kelvin to Fahrenheit, use the formula: °F = (K − 273.15) × 9/5 + 32. 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 K to °F or °F to K 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 Kelvin to Fahrenheit?
Subtract 273.15, multiply by 9/5, then add 32. Example: 300 K = (300 − 273.15) × 9/5 + 32 ≈ 80.33 °F.
What is 273.15 K in Fahrenheit?
273.15 K equals 32 °F — the freezing point of water.
What is 0 K in Fahrenheit?
Absolute zero (0 K) equals −459.67 °F.
What is 310 K in Fahrenheit?
310 K ≈ 98.33 °F — near normal human body temperature.
Why is the multiplier 9/5 and not 5/9?
The Fahrenheit degree is smaller than Kelvin: 1 K corresponds to 9/5 °F, so multiplying by 9/5 expands the value before adding the offset.