Convert Degree Fahrenheit per watt to Hour-degree Celsius per kilocalorie
Convert Degree Fahrenheit per watt (°F/W) to Hour-degree Celsius per kilocalorie (h·°C/kcal) instantly and accurately.
Conversion Formula
h·°C/kcal = °F/W × 0.6461111111
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 Hour-degree Celsius per kilocalorie
The h·°C/kcal equals 3600/4186.8 K/W ≈ 0.8598 K/W. Used in pre-SI European engineering literature (French, German, Italian) for heat transfer system calculations. A boiler with 1 h·°C/kcal resistance passes 1 kcal/h per °C temperature difference. Superseded by K/W and h·°C/W in modern standards. 1 h·°C/kcal ≈ 0.8598 K/W.
Quick Reference Table
| Degree Fahrenheit per watt (°F/W) | Hour-degree Celsius per kilocalorie (h·°C/kcal) |
|---|---|
| 1 °F/W | 0.646111 h·°C/kcal |
| 2 °F/W | 1.29222 h·°C/kcal |
| 5 °F/W | 3.23056 h·°C/kcal |
| 10 °F/W | 6.46111 h·°C/kcal |
| 25 °F/W | 16.1528 h·°C/kcal |
| 50 °F/W | 32.3056 h·°C/kcal |
| 100 °F/W | 64.6111 h·°C/kcal |