Convert Kelvin to Fahrenheit
Kelvin to Fahrenheit bridges the two temperature systems that share the least in common — one starts at absolute zero with no negative numbers in normal use, the other starts at an arbitrary point tied to a historical brine mixture. The formula needs both a subtraction and a multiplication to bring them into line.
Kelvin to Fahrenheit conversion table
| Kelvin (K) | Fahrenheit (°F) |
|---|---|
| 1 | -457.87 |
| 2 | -456.07 |
| 3 | -454.27 |
| 5 | -450.67 |
| 10 | -441.67 |
| 20 | -423.67 |
| 50 | -369.67 |
| 100 | -279.67 |
| 500 | 440.33 |
| 1,000 | 1,340.33 |
The formula
To convert Kelvin to Fahrenheit, subtract 273.15, then multiply by 9/5 and add 32:
°F = (K − 273.15) × 9/5 + 32
This is really two conversions stacked together: the −273.15 shifts Kelvin's absolute-zero starting point to Celsius's water-freezing starting point, then the ×9/5 + 32 rescales Celsius degrees (which are larger) into Fahrenheit degrees and lines up the two scales' zeros.
Worked example: Convert 100 K to Fahrenheit:
(100 − 273.15) × 9/5 + 32 = −173.15 × 1.8 + 32 = −311.67 + 32 = −279.67°F
Two more anchor points worth knowing: 0 K = −459.67°F (absolute zero), and 37 K = −393.07°F.
You'll use this when a scientific or engineering source reports Kelvin and you need the reading in the Fahrenheit scale used for everyday temperatures in the US.
Frequently asked questions
What is the Kelvin to Fahrenheit formula?
°F = (K − 273.15) × 9/5 + 32. The −273.15 converts Kelvin to Celsius first, then the ×9/5 + 32 does the usual Celsius-to-Fahrenheit step.
What is 300 K in Fahrenheit?
80.33°F. Working through the formula: (300 − 273.15) × 9/5 + 32 = 26.85 × 1.8 + 32 = 48.33 + 32 = 80.33°F — a warm day.
What is 0 K in Fahrenheit?
−459.67°F — absolute zero, the coldest temperature that exists. It's a useful anchor point, since it's the one place where all three scales (Kelvin, Celsius, and Fahrenheit) point to the same physical reality: nothing can get colder.