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.

Degree Celsius per milliwatt (°C/mW)
Hour-degree Fahrenheit per BTU (h·°F/BTU)

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/mW527.528 h·°F/BTU
2 °C/mW1055.06 h·°F/BTU
5 °C/mW2637.64 h·°F/BTU
10 °C/mW5275.28 h·°F/BTU
25 °C/mW13188.2 h·°F/BTU
50 °C/mW26376.4 h·°F/BTU
100 °C/mW52752.8 h·°F/BTU

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