BTU/(h·ft·°F)
The BTU per hour foot degree Fahrenheit is the US customary unit of thermal conductivity, exactly 1.730734666 W/(m·K). Carbon steel is about 26–30, copper about 230 BTU/(h·ft·°F).
Symbol: BTU/(h·ft·°F) (ASCII: BTU/(h*ft*F))
Quantity: thermal conductivity (k, λ)
SI relation: 1 BTU/(h·ft·°F) = 1.730734666371 W/(m·K) (exact)
Derivation: 1 BTU_IT/(h·ft·°F) = 1055.05585262 J ÷ (3600 s × 0.3048 m × 5/9 K) = 1.730734666 W/(m·K) (exact)
Exact: yes, by definition
Typical uses
- US heat transfer textbooks and ASHRAE data
- Pipe and vessel insulation calculations
- Metal conductivity in US datasheets
Convert BTU per hour foot degree Fahrenheit to other units
Open the Thermal Conductivity Converter to convert any value between all units.
Sources
- 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). BTU/(h·ft·°F). Retrieved October 25, 2026, from https://scientificconverters.com/units/btu-per-hour-foot-fahrenheit/
IEEE
Scientific Converters, "BTU/(h·ft·°F)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/btu-per-hour-foot-fahrenheit/