Convert Degree Fahrenheit per watt to Kelvin per watt
Convert Degree Fahrenheit per watt (°F/W) to Kelvin per watt (K/W) instantly and accurately.
Conversion Formula
K/W = °F/W × 0.5555555556
About Degree Fahrenheit per watt
The degree Fahrenheit per watt (°F/W) equals exactly 5/9 K/W ≈ 0.5556 K/W. It appears in US power electronics datasheets and legacy JEDEC thermal specifications where junction-to-case resistance is reported in °F/W rather than °C/W or K/W. A device rated 5 °F/W has R = 5 × 5/9 ≈ 2.78 K/W. 1 °F/W = 5/9 K/W.
About Kelvin per watt
The kelvin per watt (K/W) is the SI coherent unit for thermal resistance, defined as the temperature rise (K) per unit of steady-state power dissipation (W). Used universally in electronic component datasheets (junction-to-ambient, junction-to-case), heat sink ratings, and thermal circuit analysis. A CPU heatsink at 0.3 K/W raises temperature 30 K per 100 W. 1 K/W = 1 °C/W.
Quick Reference Table
| Degree Fahrenheit per watt (°F/W) | Kelvin per watt (K/W) |
|---|---|
| 1 °F/W | 0.555556 K/W |
| 2 °F/W | 1.11111 K/W |
| 5 °F/W | 2.77778 K/W |
| 10 °F/W | 5.55556 K/W |
| 25 °F/W | 13.8889 K/W |
| 50 °F/W | 27.7778 K/W |
| 100 °F/W | 55.5556 K/W |