Degrees Fahrenheit per watt to kelvin per watt
Type a value in °F/W to get it in K/W instantly.
1.111K/W
That's 2.2× as insulating as a large finned heatsink, while a small clip-on heatsink is 4.5× higher. A 10 W part on it would sit about 11.11 °C above ambient.
Convert the other way: K/W to °F/W
What it means
How well does it get rid of heat?
Heatsink ratings assume free air. Forced airflow can halve the figure, and a poor thermal interface can add more resistance than the heatsink removes.
The math
How to convert °F/W to K/W
To convert degrees Fahrenheit per watt to kelvin per watt, multiply by 0.555556.
Example: 2 °F/W × 0.555556 = 1.11111 K/W.
In the other direction, 1 K/W = 1.8 °F/W.
Every unit
Your resistance in every unit
Tables
°F/W to K/W conversion table
| °F/W | K/W |
|---|---|
| 0.1 °F/W | 0.0555556 K/W |
| 0.25 °F/W | 0.138889 K/W |
| 0.5 °F/W | 0.277778 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 |
| 20 °F/W | 11.1111 K/W |
| 50 °F/W | 27.7778 K/W |
| 100 °F/W | 55.5556 K/W |
| 250 °F/W | 138.889 K/W |
K/W to °F/W conversion table
| K/W | °F/W |
|---|---|
| 0.1 K/W | 0.18 °F/W |
| 0.25 K/W | 0.45 °F/W |
| 0.5 K/W | 0.9 °F/W |
| 1 K/W | 1.8 °F/W |
| 2 K/W | 3.6 °F/W |
| 5 K/W | 9 °F/W |
| 10 K/W | 18 °F/W |
| 20 K/W | 36 °F/W |
| 50 K/W | 90 °F/W |
| 100 K/W | 180 °F/W |
| 250 K/W | 450 °F/W |
Quick answers
Quick answers
- How many K/W is 1 °F/W?
- 1 °F/W is 0.555556 K/W.
- How many K/W is 10 °F/W?
- 10 °F/W is 5.55556 K/W.
- How many K/W is 2 °F/W?
- 2 °F/W is 1.11111 K/W.
The units
About these units
Degrees Fahrenheit per watt (°F/W)
A US mixed unit found on some older datasheets.
Kelvin per watt (K/W)
The SI form, and the standard on heatsink datasheets.
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