Convert Degree Celsius per milliwatt to Hour-degree Fahrenheit per BTU
Convert Degree Celsius per milliwatt (°C/mW) to Hour-degree Fahrenheit per BTU (h·°F/BTU) instantly and accurately.
Conversion Formula
h·°F/BTU = °C/mW × 527.5279263
About Degree Celsius per milliwatt
The degree Celsius per milliwatt (°C/mW) equals exactly 1000 K/W since 1 mW = 10⁻³ W and 1 °C = 1 K. Widely used in low-power semiconductor datasheets for characterising junction-to-ambient resistance: small-signal transistors, LEDs, photodiodes, and SMD resistors typically show RθJA of 50-500 °C/mW. A device at 200 °C/mW dissipating 5 mW rises 1 °C. 1 °C/mW = 1000 K/W = 1 kK/W.
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.
Quick Reference Table
| Degree Celsius per milliwatt (°C/mW) | Hour-degree Fahrenheit per BTU (h·°F/BTU) |
|---|---|
| 1 °C/mW | 527.528 h·°F/BTU |
| 2 °C/mW | 1055.06 h·°F/BTU |
| 5 °C/mW | 2637.64 h·°F/BTU |
| 10 °C/mW | 5275.28 h·°F/BTU |
| 25 °C/mW | 13188.2 h·°F/BTU |
| 50 °C/mW | 26376.4 h·°F/BTU |
| 100 °C/mW | 52752.8 h·°F/BTU |