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BTU⋅in/(h⋅ft2⋅∘F)\text{BTU}{\cdot}\text{in/(h}{\cdot}\text{ft}^{2}{\cdot}^{\circ}\text{F)}

BTU inch per hour square foot Fahrenheit

Thermal conductivityexact by definition

The BTU inch per hour square foot Fahrenheit is 0.1442278891 W/(m·K). It is the North American insulation k-value: heat per hour through one square foot of material one inch thick, per degree of temperature difference. Fibreglass batt is about 0.32, extruded polystyrene 0.20.

Watch out: Do not confuse it with BTU/(h·ft·°F), which is the same quantity per foot rather than per inch and is therefore twelve times larger. Both are in this catalog. Insulation is quoted in the inch form; pipe and metal conductivity in the foot form.

1 BTU⋅in/(h⋅ft2⋅∘F)\text{BTU}{\cdot}\text{in/(h}{\cdot}\text{ft}^{2}{\cdot}^{\circ}\text{F)} 0.14422789 W/(m⋅K)\text{W/(m}{\cdot}\text{K)}
Where the unit came from

The inch in the numerator is what makes it usable in the trade. R-value per inch is simply 1 divided by this number, so a k of 0.20 is R-5 per inch and the whole US insulation market can be discussed without a calculator.

One btu inch per hour square foot fahrenheit in every thermal conductivity unit

144.228milliwatt per meter-kelvin (mW/(m·K))
1BTU inch per hour square foot Fahrenheit (BTU·in/(h·ft²·°F))this unit
0.144228watt per meter-kelvin (W/(m·K))
0.144228watt per meter-Celsius (W/(m·°C))
0.124097kilocalorie per hour meter Celsius (kcal/(h·m·°C))
0.0833333BTU per hour-foot-Fahrenheit (BTU/(h·ft·°F))
0.00144228watt per centimeter-kelvin (W/(cm·K))
0.000344713calorie per second centimeter Celsius (cal/(s·cm·°C))
0.000144228kilowatt per meter-kelvin (kW/(m·K))
Solvers that use thermal conductivity

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