Convert BTU·in/(h·ft²·°F) to BTU/(h·ft·°F)
1 BTU inch per hour square foot degree Fahrenheit (BTU·in/(h·ft²·°F)) = 0.08333333333 BTU per hour foot degree Fahrenheit (BTU/(h·ft·°F)). 1 BTU/(h·ft·°F) = 12 BTU·in/(h·ft²·°F). Example: 15 BTU·in/(h·ft²·°F) = 15 × 0.08333333333 = 1.25 BTU/(h·ft·°F).
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1 BTU·in/(h·ft²·°F) = 0.08333333333 BTU/(h·ft·°F)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU inch per hour square foot degree Fahrenheit to BTU per hour foot degree Fahrenheit converter to paste a column from Excel.
How to Convert BTU·in/(h·ft²·°F) to BTU/(h·ft·°F)
- 1 BTU·in/(h·ft²·°F) = 0.08333333333 BTU/(h·ft·°F)
- 1 BTU/(h·ft·°F) = 12 BTU·in/(h·ft²·°F)
- Example: convert 15 BTU·in/(h·ft²·°F) to BTU/(h·ft·°F): 15 BTU·in/(h·ft²·°F) = 15 × 0.08333333333 BTU/(h·ft·°F) = 1.25 BTU/(h·ft·°F)
Formula
BTU/(h·ft·°F) = BTU·in/(h·ft²·°F) × 0.08333333333333
or BTU/(h·ft·°F) = BTU·in/(h·ft²·°F) ÷ 12
Derivation from SI units:
- 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_IT/(h·ft·°F) = 1055.05585262 J ÷ (3600 s × 0.3048 m × 5/9 K) = 1.730734666 W/(m·K) (exact)
- 1 BTU·in/(h·ft²·°F) = 0.1442278888643 W/(m·K) ÷ 1.730734666371 W/(m·K) per BTU/(h·ft·°F) = 0.08333333333333 BTU/(h·ft·°F)
Both units are defined exactly, so the factor is exact. BTU·in/(h·ft²·°F) definition: BTU inch per hour square foot degree Fahrenheit; BTU/(h·ft·°F) definition: BTU per hour foot degree Fahrenheit.
Worked examples
- A reading of 0.22 BTU·in/(h·ft²·°F) converts to 0.01833333333 BTU/(h·ft·°F).
0.22 BTU·in/(h·ft²·°F) × 0.08333333333 = 0.01833333333 BTU/(h·ft·°F) - A value of 0.3 BTU·in/(h·ft²·°F) is 0.025 BTU/(h·ft·°F).
0.3 BTU·in/(h·ft²·°F) × 0.08333333333 = 0.025 BTU/(h·ft·°F)
BTU·in/(h·ft²·°F) to BTU/(h·ft·°F) conversion table
| BTU·in/(h·ft²·°F) | BTU/(h·ft·°F) |
|---|---|
| 0.15 BTU·in/(h·ft²·°F) | 0.0125 BTU/(h·ft·°F) |
| 0.16 BTU·in/(h·ft²·°F) | 0.01333333333 BTU/(h·ft·°F) |
| 0.2 BTU·in/(h·ft²·°F) | 0.01666666667 BTU/(h·ft·°F) |
| 0.22 BTU·in/(h·ft²·°F) | 0.01833333333 BTU/(h·ft·°F) |
| 0.25 BTU·in/(h·ft²·°F) | 0.02083333333 BTU/(h·ft·°F) |
| 0.27 BTU·in/(h·ft²·°F) | 0.0225 BTU/(h·ft·°F) |
| 0.3 BTU·in/(h·ft²·°F) | 0.025 BTU/(h·ft·°F) |
| 0.5 BTU·in/(h·ft²·°F) | 0.04166666667 BTU/(h·ft·°F) |
| 1 BTU·in/(h·ft²·°F) | 0.08333333333 BTU/(h·ft·°F) |
| 5 BTU·in/(h·ft²·°F) | 0.4166666667 BTU/(h·ft·°F) |
Where it's used
BTU·in/(h·ft²·°F) are used for US insulation k-values (ASTM C177, C518), while BTU per hour foot degree Fahrenheit appear in US heat transfer textbooks and ASHRAE data. Both measure thermal conductivity (k, λ), so the conversion is a fixed factor.
BTU·in/(h·ft²·°F) to other thermal conductivity units
| Conversion | 1 BTU·in/(h·ft²·°F) equals |
|---|---|
| BTU inch per hour square foot degree Fahrenheit to BTU per hour foot degree Fahrenheit | 0.08333333333 BTU/(h·ft·°F) |
| BTU inch per hour square foot degree Fahrenheit to watt per metre kelvin | 0.1442278889 W/(m·K) |
| BTU inch per hour square foot degree Fahrenheit to milliwatt per metre kelvin | 144.2278889 mW/(m·K) |
| BTU inch per hour square foot degree Fahrenheit to kilocalorie per hour metre degree Celsius | 0.124013662 kcal/(h·m·°C) |
| BTU inch per hour square foot degree Fahrenheit to watt per centimetre kelvin | 0.001442278889 W/(cm·K) |
| BTU inch per hour square foot degree Fahrenheit to calorie per second centimetre degree Celsius | 0.0003447129275 cal/(s·cm·°C) |
Frequently asked questions
How many BTU per hour foot degree Fahrenheit are in 1 BTU inch per hour square foot degree Fahrenheit?
1 BTU·in/(h·ft²·°F) = 0.08333333333 BTU/(h·ft·°F).
How do I convert BTU inch per hour square foot degree Fahrenheit to BTU per hour foot degree Fahrenheit?
Multiply the value in BTU·in/(h·ft²·°F) by 0.08333333333, or divide it by 12. For example, 15 BTU·in/(h·ft²·°F) × 0.08333333333 = 1.25 BTU/(h·ft·°F).
Is the BTU·in/(h·ft²·°F) 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
- 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)]".
- 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 BTU·in/(h·ft²·°F) to BTU/(h·ft·°F). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-conductivity/btu-inch-per-hour-square-foot-fahrenheit-to-btu-per-hour-foot-fahrenheit/
IEEE
Scientific Converters, "Convert BTU·in/(h·ft²·°F) to BTU/(h·ft·°F)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-conductivity/btu-inch-per-hour-square-foot-fahrenheit-to-btu-per-hour-foot-fahrenheit/