Thermal Resistance Converter
Convert between 4 thermal resistance units instantly. Enter a value, pick your units and get the result with the formula, a full conversion table and worked examples.
1 h·°F/BTU in all thermal resistance units
Updates live as you type. Click a row to set it as the target unit.
| Unit | Symbol | Value |
|---|---|---|
| Kelvin per milliwatt | K/mW | 0.00189563 |
| Kelvin per watt | K/W | 1.89563 |
| Degree Celsius per watt | °C/W | 1.89563 |
| Hour degree F per BTU | h·°F/BTU | 1 |
How to Convert Thermal Resistance Units
Thermal resistance is temperature difference per unit of heat flow. The SI unit is kelvin per watt (K/W); heatsink and semiconductor datasheets quote it in °C/W.
Every unit on this page is stored as a fixed factor relative to one reference unit, the kelvin per watt (K/W). Converting is a two step multiply and divide:
- Multiply your value by the factor of the source unit to get the value in K/W.
- Divide that result by the factor of the target unit.
Hour degree F per BTU to Kelvin per watt conversion table
| Hour degree F per BTU (h·°F/BTU) | Kelvin per watt (K/W) |
|---|---|
| 1 h·°F/BTU | 1.89563 K/W |
| 2 h·°F/BTU | 3.79127 K/W |
| 3 h·°F/BTU | 5.6869 K/W |
| 4 h·°F/BTU | 7.58254 K/W |
| 5 h·°F/BTU | 9.47817 K/W |
| 6 h·°F/BTU | 11.3738 K/W |
| 7 h·°F/BTU | 13.2694 K/W |
| 8 h·°F/BTU | 15.1651 K/W |
| 9 h·°F/BTU | 17.0607 K/W |
| 10 h·°F/BTU | 18.9563 K/W |
| 15 h·°F/BTU | 28.4345 K/W |
| 20 h·°F/BTU | 37.9127 K/W |
| 25 h·°F/BTU | 47.3909 K/W |
| 30 h·°F/BTU | 56.869 K/W |
| 40 h·°F/BTU | 75.8254 K/W |
| 50 h·°F/BTU | 94.7817 K/W |
| 75 h·°F/BTU | 142.173 K/W |
| 100 h·°F/BTU | 189.563 K/W |
| 250 h·°F/BTU | 473.909 K/W |
| 500 h·°F/BTU | 947.817 K/W |
| 1,000 h·°F/BTU | 1,895.63 K/W |
Thermal Resistance Units and Conversion Factors
Value of one unit expressed in K/W.
| Unit | Symbol | In K/W |
|---|---|---|
| Kelvin per milliwatt | K/mW | 1,000 |
| Kelvin per watt | K/W | 1 |
| Degree Celsius per watt | °C/W | 1 |
| Hour degree F per BTU | h·°F/BTU | 1.895634241 |
Frequently Asked Questions
What is the SI unit of thermal resistance?
The SI unit of thermal resistance is the kelvin per watt (K/W). Thermal resistance is temperature difference per unit of heat flow.
How do I convert °C/W to K/W?
To convert degree celsius per watt (°C/W) to kelvin per watt (K/W), multiply the value in °C/W by 1. For example, 1 °C/W = 1 K/W.
How do I convert h·°F/BTU to K/W?
To convert hour degree f per btu (h·°F/BTU) to kelvin per watt (K/W), multiply the value in h·°F/BTU by 1.89563. For example, 1 h·°F/BTU = 1.89563 K/W.
Can I see a value in every thermal resistance unit at once?
Yes. Enter a value and choose the source unit; the "all units" table below the converter instantly lists the equivalent in all 4 supported units. Click any row to make it the target unit.
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