Convert Fahrenheit to Kelvin
Live bidirectional calculator for Fahrenheit (°F) and Kelvin (K) with verified formula and conversion charts.
Temperature4 units
How the Calculation Works (Affine Transformation)
Convert Fahrenheit to Celsius by subtracting 32 and multiplying by 5/9, then add 273.15 to reach Kelvin.
Fahrenheit to Kelvin Conversion Table
Precomputed values for quick reference and printing.
| Fahrenheit | Kelvin |
|---|---|
| 1 °F | 255.9278 K |
| 2 °F | 256.4833 K |
| 3 °F | 257.0389 K |
| 4 °F | 257.5944 K |
| 5 °F | 258.15 K |
| 6 °F | 258.7056 K |
| 7 °F | 259.2611 K |
| 8 °F | 259.8167 K |
| 9 °F | 260.3722 K |
| 10 °F | 260.9278 K |
| 15 °F | 263.7056 K |
| 20 °F | 266.4833 K |
| 25 °F | 269.2611 K |
| 30 °F | 272.0389 K |
| 40 °F | 277.5944 K |
| 50 °F | 283.15 K |
| 75 °F | 297.0389 K |
| 100 °F | 310.9278 K |
| Kelvin | Fahrenheit |
|---|---|
| 1 K | -457.87 °F |
| 2 K | -456.07 °F |
| 3 K | -454.27 °F |
| 4 K | -452.47 °F |
| 5 K | -450.67 °F |
| 6 K | -448.87 °F |
| 7 K | -447.07 °F |
| 8 K | -445.27 °F |
| 9 K | -443.47 °F |
| 10 K | -441.67 °F |
| 15 K | -432.67 °F |
| 20 K | -423.67 °F |
| 25 K | -414.67 °F |
| 30 K | -405.67 °F |
| 40 K | -387.67 °F |
| 50 K | -369.67 °F |
| 75 K | -324.67 °F |
| 100 K | -279.67 °F |
About Fahrenheit (°F)
The Fahrenheit scale sets 32 °F as the freezing point of water and 212 °F as the boiling point at standard atmospheric pressure, with 180 equal divisions between them.
History: Invented by Daniel Gabriel Fahrenheit in 1724. Originally based on three reference points: brine freezing, water freezing, and human body temperature.
Common Uses: Everyday temperature measurement in the United States, Belize, the Cayman Islands, and Palau.
About Kelvin (K)
The kelvin is the SI base unit of thermodynamic temperature. It is defined by setting the Boltzmann constant to exactly 1.380649 × 10⁻²³ J/K. 0 K is absolute zero.
History: Named after Lord Kelvin (William Thomson), who proposed the absolute temperature scale in 1848. Adopted as an SI base unit in 1954.
Common Uses: Physics, chemistry, engineering, color temperature in photography and lighting, and cryogenics.
❓ Frequently Asked Questions
What is 1 °F in K?
1 Fahrenheit (°F) is equal to 255.9278 Kelvin (K). Unlike linear units, temperature scales have differing zero offsets.
What is the formula to convert Fahrenheit to Kelvin?
The formula is: K = (°F - 32) × 5/9 + 273.15. Convert Fahrenheit to Celsius by subtracting 32 and multiplying by 5/9, then add 273.15 to reach Kelvin.
How do I convert 1 °F to K manually?
To convert 1 °F to K: apply the formula K = (°F - 32) × 5/9 + 273.15. Substituting gives: (1 - 32) × 5/9 + 273.15 = 255.9278 K.