Fahrenheit to Kelvin
Fahrenheit sets 32° at water's freezing point and 212° at its boiling point, still used for everyday temperatures in the US. Kelvin is the SI base unit of temperature, starting at absolute zero, used throughout science and astronomy. 1 °F equals ≈255.928 K, 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
K = °F × ≈255.928
°F = K × -457.87
Worked example: 5 °F × ≈255.928 = 258.15 K.
Conversion table
| Fahrenheit (°F) | Kelvin (K) |
|---|---|
| 1 °F | ≈255.928 K |
| 2 °F | ≈256.483 K |
| 3 °F | ≈257.039 K |
| 5 °F | 258.15 K |
| 10 °F | ≈260.928 K |
| 20 °F | ≈266.483 K |
| 25 °F | ≈269.261 K |
| 50 °F | 283.15 K |
| 100 °F | ≈310.928 K |
| 250 °F | ≈394.261 K |
| 500 °F | 533.15 K |
| 1,000 °F | ≈810.928 K |
Frequently asked
- How many Kelvin in a fahrenheit?
- 1 °F equals ≈255.928 K.
- How do I convert Fahrenheit to Kelvin?
- Multiply the value in °F by ≈255.928 to get K. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Fahrenheit and Kelvin 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.