Convert Watts per Metre Kelvin to BTU/(h·ft·°F)
1 watt per metre kelvin (W/(m·K)) = 0.5777893165 BTU per hour foot degree Fahrenheit (BTU/(h·ft·°F)). 1 BTU/(h·ft·°F) = 1.730734666 W/(m·K). Example: 50 W/(m·K) = 50 × 0.5777893165 = 28.88946583 BTU/(h·ft·°F).
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1 W/(m·K) = 0.5777893165 BTU/(h·ft·°F)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk watt per metre kelvin to BTU per hour foot degree Fahrenheit converter to paste a column from Excel.
How to Convert Watt per Metre Kelvin to BTU/(h·ft·°F)
- 1 W/(m·K) = 0.5777893165 BTU/(h·ft·°F)
- 1 BTU/(h·ft·°F) = 1.730734666 W/(m·K)
- Example: convert 50 W/(m·K) to BTU/(h·ft·°F): 50 W/(m·K) = 50 × 0.5777893165 BTU/(h·ft·°F) = 28.88946583 BTU/(h·ft·°F)
Formula
BTU/(h·ft·°F) = W/(m·K) × 0.577789316543
or BTU/(h·ft·°F) = W/(m·K) ÷ 1.730734666371
Derivation from SI units:
- The SI unit of thermal conductivity: heat flow (W) per metre of thickness per kelvin of temperature difference
- 1 BTU_IT/(h·ft·°F) = 1055.05585262 J ÷ (3600 s × 0.3048 m × 5/9 K) = 1.730734666 W/(m·K) (exact)
Both units are defined exactly, so the factor is exact. Watt per Metre Kelvin definition: watt per metre kelvin; BTU/(h·ft·°F) definition: BTU per hour foot degree Fahrenheit.
Worked examples
- Copper at 401 W/(m·K) is 231.6935159 BTU/(h·ft·°F).
401 W/(m·K) × 0.5777893165 = 231.6935159 BTU/(h·ft·°F) - Stainless steel 304 at about 16 W/(m·K) is 9.244629065 BTU/(h·ft·°F).
16 W/(m·K) × 0.5777893165 = 9.244629065 BTU/(h·ft·°F)
Watt per Metre Kelvin to BTU/(h·ft·°F) conversion table
| Watts per Metre Kelvin (W/(m·K)) | BTU/(h·ft·°F) |
|---|---|
| 0.024 W/(m·K) | 0.0138669436 BTU/(h·ft·°F) |
| 0.035 W/(m·K) | 0.02022262608 BTU/(h·ft·°F) |
| 0.04 W/(m·K) | 0.02311157266 BTU/(h·ft·°F) |
| 0.15 W/(m·K) | 0.08666839748 BTU/(h·ft·°F) |
| 0.6 W/(m·K) | 0.3466735899 BTU/(h·ft·°F) |
| 1 W/(m·K) | 0.5777893165 BTU/(h·ft·°F) |
| 1.4 W/(m·K) | 0.8089050432 BTU/(h·ft·°F) |
| 16 W/(m·K) | 9.244629065 BTU/(h·ft·°F) |
| 50 W/(m·K) | 28.88946583 BTU/(h·ft·°F) |
| 205 W/(m·K) | 118.4468099 BTU/(h·ft·°F) |
| 401 W/(m·K) | 231.6935159 BTU/(h·ft·°F) |
Where it's used
SI thermal conductivities in W/(m·K) are converted to BTU/(h·ft·°F) for US heat exchanger, piping and HVAC calculations. Divide by about 1.7307.
Watt per Metre Kelvin to other thermal conductivity units
| Conversion | 1 W/(m·K) equals |
|---|---|
| watt per metre kelvin to BTU per hour foot degree Fahrenheit | 0.5777893165 BTU/(h·ft·°F) |
| watt per metre kelvin to BTU inch per hour square foot degree Fahrenheit | 6.933471799 BTU·in/(h·ft²·°F) |
| watt per metre kelvin to milliwatt per metre kelvin | 1000 mW/(m·K) |
| watt per metre kelvin to kilocalorie per hour metre degree Celsius | 0.8598452279 kcal/(h·m·°C) |
| watt per metre kelvin to watt per centimetre kelvin | 0.01 W/(cm·K) |
| watt per metre kelvin to calorie per second centimetre degree Celsius | 0.002390057361 cal/(s·cm·°C) |
Frequently asked questions
How many BTU/(h·ft·°F) is 1 W/(m·K)?
1 W/(m·K) = 0.577789 BTU/(h·ft·°F).
How many BTU per hour foot degree Fahrenheit are in 1 watt per metre kelvin?
1 W/(m·K) = 0.5777893165 BTU/(h·ft·°F).
How do I convert watts per metre kelvin to BTU per hour foot degree Fahrenheit?
Multiply the value in W/(m·K) by 0.5777893165, or divide it by 1.730734666. For example, 50 W/(m·K) × 0.5777893165 = 28.88946583 BTU/(h·ft·°F).
Is the W/(m·K) to BTU/(h·ft·°F) conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "British thermal unit_IT per hour foot degree Fahrenheit [Btu_IT/(h · ft · °F)]".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Watts per Metre Kelvin to BTU/(h·ft·°F). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-conductivity/watts-per-meter-kelvin-to-btu-per-hour-foot-fahrenheit/
IEEE
Scientific Converters, "Convert Watts per Metre Kelvin to BTU/(h·ft·°F)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-conductivity/watts-per-meter-kelvin-to-btu-per-hour-foot-fahrenheit/