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Heat Transfer

W/(m·K)toBTU/(hr·ft·°F)

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

Factor1 W/(m·K) = 0.5777893 BTU/(hr·ft·°F)

Converter

W/(m·K)

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

Result
5.77789BTU/(hr·ft·°F)

Rendered to 6 significant figures.

Formula

Formula
BTU/(hr·ft·°F) = W/(m·K) × 0.5777893

Multiply any value in watts per metre-kelvin by 0.5777893 to obtain the value in British thermal units per hour-foot-Fahrenheit.

Worked example

Convert 10 W/(m·K) to BTU/(hr·ft·°F).

  1. 01Start with 10 W/(m·K).
  2. 02Multiply by the conversion factor: 10 × 0.5777893 = 5.77789 BTU/(hr·ft·°F).
Result10 W/(m·K) = 5.77789 BTU/(hr·ft·°F)

Conversion table

W/(m·K)BTU/(hr·ft·°F)
10.57779
21.1556
52.8889
105.7779
2011.556
5028.889
10057.779
200115.56
500288.89
1000577.79

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from W/(m·K) to BTU/(hr·ft·°F)?
1 W/(m·K) equals 0.5777893 BTU/(hr·ft·°F). To convert, multiply the value in watts per metre-kelvin by 0.5777893.
How do I convert 1 W/(m·K) to BTU/(hr·ft·°F)?
1 W/(m·K) = 0.577789 BTU/(hr·ft·°F). For any value, multiply by 0.5777893.
How do I convert BTU/(hr·ft·°F) back to W/(m·K)?
Divide by the same factor — or equivalently, multiply by 1.730735. So 1 BTU/(hr·ft·°F) = 1.73073 W/(m·K).
When would I need to convert watt per metre-kelvin to British thermal unit per hour-foot-Fahrenheit?
Thermal conductivity conversions between W/(m·K) and BTU/(hr·ft·°F) 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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