UnitConvertFahrenheit 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.
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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
Sources
Conversion factors use the exact definitions published by NIST and the BIPM, and are checked by automated tests against those definitions.
- NIST Special Publication 811: Guide for the Use of the International System of Units
- BIPM: The International System of Units (SI Brochure)
- NIST Handbook 44, Appendix C: General Tables of Units of Measurement
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