Convert BTU/(h·ft·°F) to BTU·in/(h·ft²·°F)
1 BTU per hour foot degree Fahrenheit (BTU/(h·ft·°F)) = 12 BTU inch per hour square foot degree Fahrenheit (BTU·in/(h·ft²·°F)). 1 BTU·in/(h·ft²·°F) = 0.08333333333 BTU/(h·ft·°F). Example: 15 BTU/(h·ft·°F) = 15 × 12 = 180 BTU·in/(h·ft²·°F).
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1 BTU/(h·ft·°F) = 12 BTU·in/(h·ft²·°F)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU per hour foot degree Fahrenheit to BTU inch per hour square foot degree Fahrenheit converter to paste a column from Excel.
How to Convert BTU/(h·ft·°F) to BTU·in/(h·ft²·°F)
- 1 BTU/(h·ft·°F) = 12 BTU·in/(h·ft²·°F)
- 1 BTU·in/(h·ft²·°F) = 0.08333333333 BTU/(h·ft·°F)
- Example: convert 15 BTU/(h·ft·°F) to BTU·in/(h·ft²·°F): 15 BTU/(h·ft·°F) = 15 × 12 BTU·in/(h·ft²·°F) = 180 BTU·in/(h·ft²·°F)
Formula
BTU·in/(h·ft²·°F) = BTU/(h·ft·°F) × 12
Derivation from SI units:
- 1 BTU_IT/(h·ft·°F) = 1055.05585262 J ÷ (3600 s × 0.3048 m × 5/9 K) = 1.730734666 W/(m·K) (exact)
- 1 BTU_IT·in/(h·ft²·°F) = 1055.05585262 J × 0.0254 m ÷ (3600 s × 0.09290304 m² × 5/9 K) = 0.1442278889 W/(m·K) (exact)
- 1 BTU/(h·ft·°F) = 1.730734666371 W/(m·K) ÷ 0.1442278888643 W/(m·K) per BTU·in/(h·ft²·°F) = 12 BTU·in/(h·ft²·°F)
Both units are defined exactly, so the factor is exact. BTU/(h·ft·°F) definition: BTU per hour foot degree Fahrenheit; BTU·in/(h·ft²·°F) definition: BTU inch per hour square foot degree Fahrenheit.
Worked examples
- A reading of 0.1 BTU/(h·ft·°F) converts to 1.2 BTU·in/(h·ft²·°F).
0.1 BTU/(h·ft·°F) × 12 = 1.2 BTU·in/(h·ft²·°F) - A value of 9.4 BTU/(h·ft·°F) is 112.8 BTU·in/(h·ft²·°F).
9.4 BTU/(h·ft·°F) × 12 = 112.8 BTU·in/(h·ft²·°F)
BTU/(h·ft·°F) to BTU·in/(h·ft²·°F) conversion table
| BTU/(h·ft·°F) | BTU·in/(h·ft²·°F) |
|---|---|
| 0.014 BTU/(h·ft·°F) | 0.168 BTU·in/(h·ft²·°F) |
| 0.02 BTU/(h·ft·°F) | 0.24 BTU·in/(h·ft²·°F) |
| 0.023 BTU/(h·ft·°F) | 0.276 BTU·in/(h·ft²·°F) |
| 0.1 BTU/(h·ft·°F) | 1.2 BTU·in/(h·ft²·°F) |
| 0.35 BTU/(h·ft·°F) | 4.2 BTU·in/(h·ft²·°F) |
| 1 BTU/(h·ft·°F) | 12 BTU·in/(h·ft²·°F) |
| 9.4 BTU/(h·ft·°F) | 112.8 BTU·in/(h·ft²·°F) |
| 26 BTU/(h·ft·°F) | 312 BTU·in/(h·ft²·°F) |
| 118 BTU/(h·ft·°F) | 1416 BTU·in/(h·ft²·°F) |
| 232 BTU/(h·ft·°F) | 2784 BTU·in/(h·ft²·°F) |
Where it's used
BTU/(h·ft·°F) are used for US heat transfer textbooks and ASHRAE data, while BTU inch per hour square foot degree Fahrenheit appear in US insulation k-values (ASTM C177, C518). Both measure thermal conductivity (k, λ), so the conversion is a fixed factor.
BTU/(h·ft·°F) to other thermal conductivity units
| Conversion | 1 BTU/(h·ft·°F) equals |
|---|---|
| BTU per hour foot degree Fahrenheit to BTU inch per hour square foot degree Fahrenheit | 12 BTU·in/(h·ft²·°F) |
| BTU per hour foot degree Fahrenheit to watt per metre kelvin | 1.730734666 W/(m·K) |
| BTU per hour foot degree Fahrenheit to milliwatt per metre kelvin | 1730.734666 mW/(m·K) |
| BTU per hour foot degree Fahrenheit to kilocalorie per hour metre degree Celsius | 1.488163944 kcal/(h·m·°C) |
| BTU per hour foot degree Fahrenheit to watt per centimetre kelvin | 0.01730734666 W/(cm·K) |
| BTU per hour foot degree Fahrenheit to calorie per second centimetre degree Celsius | 0.00413655513 cal/(s·cm·°C) |
Frequently asked questions
How many BTU inch per hour square foot degree Fahrenheit are in 1 BTU per hour foot degree Fahrenheit?
1 BTU/(h·ft·°F) = 12 BTU·in/(h·ft²·°F).
How do I convert BTU per hour foot degree Fahrenheit to BTU inch per hour square foot degree Fahrenheit?
Multiply the value in BTU/(h·ft·°F) by 12. For example, 15 BTU/(h·ft·°F) × 12 = 180 BTU·in/(h·ft²·°F).
Is the BTU/(h·ft·°F) to BTU·in/(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
- 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)]".
- 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 inch per hour square foot degree Fahrenheit [Btu_IT · in/(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 BTU/(h·ft·°F) to BTU·in/(h·ft²·°F). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-conductivity/btu-per-hour-foot-fahrenheit-to-btu-inch-per-hour-square-foot-fahrenheit/
IEEE
Scientific Converters, "Convert BTU/(h·ft·°F) to BTU·in/(h·ft²·°F)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-conductivity/btu-per-hour-foot-fahrenheit-to-btu-inch-per-hour-square-foot-fahrenheit/