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Heat Transfer

BTU/(hr·ft·°F)toW/(m·K)

Convert British thermal units per hour-foot-Fahrenheit (BTU/(hr·ft·°F)) to watts per metre-kelvin (W/(m·K)).

Factor1 BTU/(hr·ft·°F) = 1.730735 W/(m·K)

Converter

BTU/(hr·ft·°F)

Accepts numbers or expressions, e.g. 150 + 14.7

Result
17.3073W/(m·K)

Rendered to 6 significant figures.

Formula

Formula
W/(m·K) = BTU/(hr·ft·°F) × 1.730735

Multiply any value in British thermal units per hour-foot-Fahrenheit by 1.730735 to obtain the value in watts per metre-kelvin.

Worked example

Convert 10 BTU/(hr·ft·°F) to W/(m·K).

  1. 01Start with 10 BTU/(hr·ft·°F).
  2. 02Multiply by the conversion factor: 10 × 1.730735 = 17.3073 W/(m·K).
Result10 BTU/(hr·ft·°F) = 17.3073 W/(m·K)

Conversion table

BTU/(hr·ft·°F)W/(m·K)
11.7307
23.4615
58.6537
1017.307
2034.615
5086.537
100173.07
200346.15
500865.37
10001730.7

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/(hr·ft·°F) to W/(m·K)?
1 BTU/(hr·ft·°F) equals 1.730735 W/(m·K). To convert, multiply the value in British thermal units per hour-foot-Fahrenheit by 1.730735.
How do I convert 1 BTU/(hr·ft·°F) to W/(m·K)?
1 BTU/(hr·ft·°F) = 1.73073 W/(m·K). For any value, multiply by 1.730735.
How do I convert W/(m·K) back to BTU/(hr·ft·°F)?
Divide by the same factor — or equivalently, multiply by 0.5777893. So 1 W/(m·K) = 0.577789 BTU/(hr·ft·°F).
When would I need to convert British thermal unit per hour-foot-Fahrenheit to watt per metre-kelvin?
Thermal conductivity conversions between BTU/(hr·ft·°F) and W/(m·K) are common in insulation specification, heat-exchanger design, and building-envelope analysis. SI units (W/(m·K)) appear in international standards and simulation tools, while BTU/(hr·ft·°F) is standard in US codes and vendor datasheets.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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