Convert Watts per Square Metre Kelvin to BTU/(h·ft²·°F)
1 watt per square metre kelvin (W/(m²·K)) = 0.1761101837 BTU per hour square foot degree Fahrenheit (BTU/(h·ft²·°F)). 1 BTU/(h·ft²·°F) = 5.678263341 W/(m²·K). Example: 1.4 W/(m²·K) = 1.4 × 0.1761101837 = 0.2465542572 BTU/(h·ft²·°F).
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1 W/(m²·K) = 0.1761101837 BTU/(h·ft²·°F)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk watt per square metre kelvin to BTU per hour square foot degree Fahrenheit converter to paste a column from Excel.
How to Convert Watt per Square Metre Kelvin to BTU/(h·ft²·°F)
- 1 W/(m²·K) = 0.1761101837 BTU/(h·ft²·°F)
- 1 BTU/(h·ft²·°F) = 5.678263341 W/(m²·K)
- Example: convert 1.4 W/(m²·K) to BTU/(h·ft²·°F): 1.4 W/(m²·K) = 1.4 × 0.1761101837 BTU/(h·ft²·°F) = 0.2465542572 BTU/(h·ft²·°F)
Formula
BTU/(h·ft²·°F) = W/(m²·K) × 0.1761101836823
or BTU/(h·ft²·°F) = W/(m²·K) ÷ 5.678263341113
Derivation from SI units:
- The SI unit of heat transfer coefficient and thermal transmittance (U-value): heat flow (W) per square metre per kelvin
- 1 BTU_IT/(h·ft²·°F) = 1055.05585262 J ÷ (3600 s × 0.09290304 m² × 5/9 K) = 5.678263341 W/(m²·K) (exact)
Both units are defined exactly, so the factor is exact. Watt per Square Metre Kelvin definition: watt per square metre kelvin; BTU/(h·ft²·°F) definition: BTU per hour square foot degree Fahrenheit.
Worked examples
- A double-glazed window with U = 1.4 W/(m²·K) is 0.2465542572 BTU/(h·ft²·°F).
1.4 W/(m²·K) × 0.1761101837 = 0.2465542572 BTU/(h·ft²·°F) - A wall with U = 0.18 W/(m²·K) is 0.03169983306 BTU/(h·ft²·°F).
0.18 W/(m²·K) × 0.1761101837 = 0.03169983306 BTU/(h·ft²·°F)
Watt per Square Metre Kelvin to BTU/(h·ft²·°F) conversion table
| Watts per Square Metre Kelvin (W/(m²·K)) | BTU/(h·ft²·°F) |
|---|---|
| 0.15 W/(m²·K) | 0.02641652755 BTU/(h·ft²·°F) |
| 0.25 W/(m²·K) | 0.04402754592 BTU/(h·ft²·°F) |
| 0.3 W/(m²·K) | 0.0528330551 BTU/(h·ft²·°F) |
| 1.4 W/(m²·K) | 0.2465542572 BTU/(h·ft²·°F) |
| 2.8 W/(m²·K) | 0.4931085143 BTU/(h·ft²·°F) |
| 5 W/(m²·K) | 0.8805509184 BTU/(h·ft²·°F) |
| 10 W/(m²·K) | 1.761101837 BTU/(h·ft²·°F) |
| 25 W/(m²·K) | 4.402754592 BTU/(h·ft²·°F) |
| 100 W/(m²·K) | 17.61101837 BTU/(h·ft²·°F) |
| 1000 W/(m²·K) | 176.1101837 BTU/(h·ft²·°F) |
| 5000 W/(m²·K) | 880.5509184 BTU/(h·ft²·°F) |
Where it's used
Metric U-values and convection coefficients in W/(m²·K) are converted to BTU/(h·ft²·°F) for US codes, NFRC ratings and ASHRAE calculations. Divide by about 5.678.
Watt per Square Metre Kelvin to other heat transfer coefficient units
| Conversion | 1 W/(m²·K) equals |
|---|---|
| watt per square metre kelvin to BTU per hour square foot degree Fahrenheit | 0.1761101837 BTU/(h·ft²·°F) |
| watt per square metre kelvin to kilowatt per square metre kelvin | 0.001 kW/(m²·K) |
| watt per square metre kelvin to kilocalorie per hour square metre degree Celsius | 0.8598452279 kcal/(h·m²·°C) |
| watt per square metre kelvin to watt per square centimetre kelvin | 0.0001 W/(cm²·K) |
| watt per square metre kelvin to calorie per second square centimetre degree Celsius | 0.00002390057361 cal/(s·cm²·°C) |
Frequently asked questions
How many BTU/(h·ft²·°F) is 1 W/(m²·K)?
1 W/(m²·K) = 0.17611 BTU/(h·ft²·°F).
How many BTU per hour square foot degree Fahrenheit are in 1 watt per square metre kelvin?
1 W/(m²·K) = 0.1761101837 BTU/(h·ft²·°F).
How do I convert watts per square metre kelvin to BTU per hour square foot degree Fahrenheit?
Multiply the value in W/(m²·K) by 0.1761101837, or divide it by 5.678263341. For example, 1.4 W/(m²·K) × 0.1761101837 = 0.2465542572 BTU/(h·ft²·°F).
Is the W/(m²·K) to BTU/(h·ft²·°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 square foot degree Fahrenheit [Btu_IT/(h · ft² · °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 Square Metre Kelvin to BTU/(h·ft²·°F). Retrieved October 25, 2026, from https://scientificconverters.com/heat-transfer-coefficient/watts-per-square-meter-kelvin-to-btu-per-hour-square-foot-fahrenheit/
IEEE
Scientific Converters, "Convert Watts per Square Metre Kelvin to BTU/(h·ft²·°F)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/heat-transfer-coefficient/watts-per-square-meter-kelvin-to-btu-per-hour-square-foot-fahrenheit/