Convert Kelvin to Fahrenheit
Live bidirectional calculator for Kelvin (K) and Fahrenheit (°F) with verified formula and conversion charts.
Temperature4 units
How the Calculation Works (Affine Transformation)
Convert Kelvin to Celsius by subtracting 273.15, multiply by 9/5, then add 32 to reach Fahrenheit.
Kelvin to Fahrenheit Conversion Table
Precomputed values for quick reference and printing.
| 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 |
| 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 |
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.
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.
❓ Frequently Asked Questions
What is 1 K in °F?
1 Kelvin (K) is equal to -457.87 Fahrenheit (°F). Unlike linear units, temperature scales have differing zero offsets.
What is the formula to convert Kelvin to Fahrenheit?
The formula is: °F = (K - 273.15) × 9/5 + 32. Convert Kelvin to Celsius by subtracting 273.15, multiply by 9/5, then add 32 to reach Fahrenheit.
How do I convert 1 K to °F manually?
To convert 1 K to °F: apply the formula °F = (K - 273.15) × 9/5 + 32. Substituting gives: (1 - 273.15) × 9/5 + 32 = -457.87 °F.