Thermal Resistance / °F·h/Btu IT → °C/W
Convert Fahrenheit degree hours per Btu IT to Celsius degrees per watt
Convert whole-object thermal resistance in temperature difference per power. Convert Fahrenheit degree hours per Btu IT (°F·h/Btu IT) to Celsius degrees per watt (°C/W). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Celsius degrees per watt to Fahrenheit degree hours per Btu IT →
How to convert Fahrenheit degree hours per Btu IT to Celsius degrees per watt
These units describe thermal resistance K/W. Area-normalized insulation R-values in m²·K/W need a known area and are not interchangeable with whole-object resistance.
Use x for the value in °F·h/Btu IT, b for the intermediate value in K/W, and y for the result in °C/W.
°C/W = °F·h/Btu IT × 1.8956342406266344
Worked examples
10 °F·h/Btu IT ≈ 18.9563424063 °C/W
Step 1: (10 × 1.89563424063) ≈ 18.9563424063 K/W.
Step 2: 18.9563424063 ÷ 1 ≈ 18.9563424063 °C/W.20 °F·h/Btu IT ≈ 37.9126848125 °C/W
Step 1: (20 × 1.89563424063) ≈ 37.9126848125 K/W.
Step 2: 37.9126848125 ÷ 1 ≈ 37.9126848125 °C/W.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Fahrenheit degree hours per Btu IT
Fahrenheit degree hours per Btu IT (°F·h/Btu IT) measures thermal resistance under the conventions above. The base value in K/W is (x × 1.89563424063), where x is the numerical value in °F·h/Btu IT. Factors shown here are rounded for display; calculations use the stored factor.
About Celsius degrees per watt
Celsius degrees per watt (°C/W) measures thermal resistance under the conventions above. The base value in K/W is (x × 1), where x is the numerical value in °C/W. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Keep these unit conventions consistent when using measurements in construction calculations.
Fahrenheit degree hours per Btu IT to Celsius degrees per watt reference table
| Fahrenheit degree hours per Btu IT (°F·h/Btu IT) | Celsius degrees per watt (°C/W) |
|---|---|
| 1 | 1.89563424063 |
| 5 | 9.47817120313 |
| 10 | 18.9563424063 |
| 25 | 47.3908560157 |
| 50 | 94.7817120313 |
| 100 | 189.563424063 |
| 1000 | 1895.63424063 |
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