Convert Hour-degree Fahrenheit per BTU to Degree Celsius per watt
Convert Hour-degree Fahrenheit per BTU (h·°F/BTU) to Degree Celsius per watt (°C/W) instantly and accurately.
Conversion Formula
°C/W = h·°F/BTU × 1.895634241
About Hour-degree Fahrenheit per BTU
The h·°F/BTU equals (5/9 × 3600)/1055.05585262 K/W ≈ 1.8956 K/W. It is the traditional US unit for thermal resistance in HVAC, building science, and insulation engineering. A pipe fitting with R = 1 h·°F/BTU passes 1 BTU/h per °F driving difference. Appears in ASHRAE handbooks, ASTM C177, and older US plumbing codes. 1 h·°F/BTU ≈ 1.8956 K/W.
About Degree Celsius per watt
The degree Celsius per watt (°C/W) equals exactly 1 K/W since temperature intervals 1 °C = 1 K. It is the dominant notation in semiconductor, LED, and power electronics datasheets worldwide. Thermal resistance values such as RθJA (junction-to-ambient) and RθJC (junction-to-case) are almost universally quoted in °C/W. A package at 50 °C/W dissipating 2 W yields ΔT = 100 °C. 1 °C/W = 1 K/W.
Quick Reference Table
| Hour-degree Fahrenheit per BTU (h·°F/BTU) | Degree Celsius per watt (°C/W) |
|---|---|
| 1 h·°F/BTU | 1.89563 °C/W |
| 2 h·°F/BTU | 3.79127 °C/W |
| 5 h·°F/BTU | 9.47817 °C/W |
| 10 h·°F/BTU | 18.9563 °C/W |
| 25 h·°F/BTU | 47.3909 °C/W |
| 50 h·°F/BTU | 94.7817 °C/W |
| 100 h·°F/BTU | 189.563 °C/W |