Convert Kelvin to Fahrenheit
Fahrenheit = Kelvin × 1.8 − 459.67. Type any temperature below to convert kelvin to fahrenheit both ways — it runs entirely in your browser.
Kelvin to Fahrenheit formula
Temperature scales have different zero points, so the conversion is a multiply-and-add, not a single ratio:
Fahrenheit = Kelvin × 1.8 − 459.67
To go the other way, Kelvin = Fahrenheit × 0.5555556 + 255.3722.
Worked example
Convert 300 K to fahrenheit:
= 300 × 1.8 − 459.67 = 80.33 °F.
Common temperatures in Kelvin and Fahrenheit
| Reference point | Kelvin (K) | Fahrenheit (°F) |
|---|---|---|
| Absolute zero | 0 | -459.67 |
| Freezing point of water | 273.15 | 32 |
| Refrigerator | 277.15 | 39.2 |
| Room temperature | 294.15 | 69.8 |
| Normal human body temperature | 310.15 | 98.6 |
| A hot summer day | 318.15 | 113 |
| Boiling point of water (sea level) | 373.15 | 212 |
About the Kelvin and Fahrenheit scales
Kelvin: The kelvin is the SI base unit of temperature. It starts at absolute zero (0 K = −273.15 °C) and uses the same degree size as Celsius, so it is written without a degree sign.
Fahrenheit: Fahrenheit puts water’s freezing point at 32° and its boiling point at 212° — a 180-degree span. It is the everyday scale in the United States and a few other territories.
Frequently asked questions
- What is 300 K in Fahrenheit?
- 300 K = 80.33 °F.
- How do I convert Kelvin to Fahrenheit?
- Use fahrenheit = kelvin × 1.8 − 459.67. For example, 300 K → 80.33 °F.
- How do I convert Fahrenheit back to Kelvin?
- Reverse it: kelvin = fahrenheit × 0.5555556 + 255.3722.
- Why isn't converting Kelvin to Fahrenheit just multiplication?
- Because the two scales start their zero at different temperatures, so after scaling by 1.8 you also subtract 459.67. Skipping that constant is the most common temperature-conversion mistake.