Kelvin to Fahrenheit
Kelvin is the SI base unit of temperature, starting at absolute zero, used throughout science and astronomy. Fahrenheit sets 32° at water's freezing point and 212° at its boiling point, still used for everyday temperatures in the US. 1 K equals -457.87 °F, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to temperature, measured here against temperature's base unit (°C) — every other temperature unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
°F = K × -457.87
K = °F × ≈255.928
Worked example: 5 K × -457.87 = -450.67 °F.
Conversion table
| Kelvin (K) | Fahrenheit (°F) |
|---|---|
| 1 K | -457.87 °F |
| 2 K | -456.07 °F |
| 3 K | -454.27 °F |
| 5 K | -450.67 °F |
| 10 K | -441.67 °F |
| 20 K | -423.67 °F |
| 25 K | -414.67 °F |
| 50 K | -369.67 °F |
| 100 K | -279.67 °F |
| 250 K | -9.67 °F |
| 500 K | 440.33 °F |
| 1,000 K | 1,340.33 °F |
Frequently asked
- How many Fahrenheit in a kelvin?
- 1 K equals -457.87 °F.
- How do I convert Kelvin to Fahrenheit?
- Multiply the value in K by -457.87 to get °F. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Kelvin and Fahrenheit are both defined by a fixed conversion factor to temperature's base unit (°C), so the result shown is exact to the precision displayed, not an approximation.