UnitSnapFahrenheit to Kelvin
1 °F = 255.9278 K
Fahrenheit to kelvin comes up mostly in American engineering and science classes, where measurements start in everyday US units but equations demand an absolute scale. It is a two-step conversion, so it is easy to get wrong without a calculator.
When you need to convert degrees Fahrenheit to kelvins
- US engineering homework that starts from Fahrenheit measurements
- Converting HVAC or process temperatures for thermodynamic calculations
- Comparing US weather data with scientific datasets in kelvins
- Checking cryogenic or furnace specifications from American suppliers
How to convert degrees Fahrenheit to kelvins
K = °F × 0.5555556 + 255.3722
Example: 25 °F = 269.2611 K
Common temperatures
| Fahrenheit (°F) | Kelvin (K) |
|---|---|
| -459.67 °F | 0 K |
| -321 °F | 77.03889 K |
| -40 °F | 233.15 K |
| 0 °F | 255.3722 K |
| 32 °F | 273.15 K |
| 68 °F | 293.15 K |
| 98.6 °F | 310.15 K |
| 212 °F | 373.15 K |
| 451 °F | 505.9278 K |
| 1,000 °F | 810.9278 K |
Tips for converting degrees Fahrenheit to kelvins
- Exact formula: K = (°F + 459.67) × 5/9. Equivalently, convert to Celsius first, then add 273.15.
- Do not just add 273.15 to a Fahrenheit value; that shortcut only works from Celsius and gives a badly wrong answer.
- US engineers sometimes use the Rankine scale instead, which is Fahrenheit-sized degrees starting at absolute zero (°R = °F + 459.67).
Fahrenheit to Kelvin conversion table
| Fahrenheit (°F) | Kelvin (K) |
|---|---|
| -40 °F | 233.15 K |
| -20 °F | 244.2611 K |
| -10 °F | 249.8167 K |
| 0 °F | 255.3722 K |
| 10 °F | 260.9278 K |
| 20 °F | 266.4833 K |
| 25 °F | 269.2611 K |
| 30 °F | 272.0389 K |
| 37 °F | 275.9278 K |
| 40 °F | 277.5944 K |
| 50 °F | 283.15 K |
| 60 °F | 288.7056 K |
| 70 °F | 294.2611 K |
| 80 °F | 299.8167 K |
| 90 °F | 305.3722 K |
| 100 °F | 310.9278 K |
| 150 °F | 338.7056 K |
| 200 °F | 366.4833 K |
| 300 °F | 422.0389 K |
About the units
Fahrenheit: The degree Fahrenheit is the temperature scale used in the United States. Water freezes at 32 °F and boils at 212 °F at sea level.
Kelvin: The kelvin is the SI base unit of thermodynamic temperature. 0 K is absolute zero, and a change of 1 K equals a change of 1 °C.
Convert offline on your phone. 36 categories, live currency rates, calculators and history in our free Unit Converter app.
Frequently asked questions
What is 1 degree Fahrenheit in kelvins?
1 degree Fahrenheit equals 255.9278 kelvins.
What is 1 kelvin in degrees Fahrenheit?
1 kelvin equals -457.87 degrees Fahrenheit.
How do I convert degrees Fahrenheit to kelvins?
Use the formula K = °F × 0.5555556 + 255.3722.
What is 10 degrees Fahrenheit in kelvins?
10 degrees Fahrenheit equals 260.9278 kelvins.
Related conversions
Factors: NIST SP 811 · SI Brochure · NIST Handbook 44 — Updated