BTU (IT) per Hour Square Foot (BTU (IT)/(h·ft²))
BTU (IT) per hour square foot is an imperial heat flux unit equal to about 3.155 W/m².
This BTU-based flux unit is common in US building heat loss, solar gain, and fire engineering calculations.
BTU (IT) per Hour Square Foot to Watt per Square Meter
Convert btu (it) per hour square foot to watt per square meter instantly. Type in either field — results update live.
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Heat Flux Density BTU (IT) per Hour Square Foot Watt per Square Meter
1 btu (it) per hour square foot = 3.154591186 watts per square meter
Unit
Unit
Conversion table
Selected BTU (IT)/(h·ft²) values converted to W/m² using the exact factor from this tool.
| BTU (IT)/(h·ft²) | W/m² |
|---|---|
| 0.01 | 0.0315459119 |
| 0.1 | 0.3154591186 |
| 1 | 3.154591186 |
| 2 | 6.309182372 |
| 3 | 9.463773558 |
| 5 | 15.77295593 |
| 10 | 31.54591186 |
| 20 | 63.09182372 |
| 50 | 157.7295593 |
| 100 | 315.4591186 |
| 1,000 | 3,154.591186 |
How to convert
Exact conversion factors in both directions, plus a worked example.
1 BTU (IT)/(h·ft²) = 3.154591186 W/m²
1 W/m² = 0.3169982863 BTU (IT)/(h·ft²)
To convert btu (it) per hour square foot to watt per square meter, multiply by 3.154591186.
To convert watt per square meter to btu (it) per hour square foot, multiply by 0.3169982863.
Example: convert 10 BTU (IT)/(h·ft²) to W/m²
10 × 3.154591186 = 31.54591186 W/m²
About these units
Short background on the units used in this conversion.
Watt per Square Meter (W/m²)
The watt per square meter (W/m²) is the SI unit of heat flux density — instantaneous thermal power per unit area.
Watts per square meter describe convection, radiation, and conduction heat flow rates at surfaces in HVAC and electronics cooling.
Frequently asked questions
How many watts per square meter are in one btu (it) per hour square foot?
One btu (it) per hour square foot equals 3.154591186 watts per square meter. Multiply your BTU (IT) per hour square foot value by 3.154591186 to convert to watts per square meter.
What is the conversion formula?
W/m² = BTU (IT)/(h·ft²) × 3.154591186The reverse is
BTU (IT)/(h·ft²) = W/m² × 0.3169982863, using the same exact factors as this converter.Is this BTU (IT) per Hour Square Foot to Watt per Square Meter converter private?
Yes. All calculations run locally in your browser. Nothing you type is sent to a server.
All btu (it) per hour square foot conversions
Jump to any heat flux density conversion starting from btu (it) per hour square foot — including the reverse direction and every other unit in our dataset.
watt per square meter (W/m²) → btu (it) per hour square foot (BTU (IT)/(h·ft²))
btu (it) per hour square foot (BTU (IT)/(h·ft²)) → kilowatt per square meter (kW/m²)btu (it) per hour square foot (BTU (IT)/(h·ft²)) → joule per second square meter (J/(s·m²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → watt per square centimeter (W/cm²)btu (it) per hour square foot (BTU (IT)/(h·ft²)) → watt per square inch (W/in²)btu (it) per hour square foot (BTU (IT)/(h·ft²)) → kilocalorie (it) per hour square meter (kcal (IT)/(h·m²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → calorie (it) per second square centimeter (cal (IT)/(s·cm²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → calorie (it) per minute square centimeter (cal (IT)/(min·cm²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → calorie (it) per hour square centimeter (cal (IT)/(h·cm²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → calorie (thermochemical) per second square centimeter (cal (th)/(s·cm²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → calorie (thermochemical) per minute square centimeter (cal (th)/(min·cm²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → calorie (thermochemical) per hour square centimeter (cal (th)/(h·cm²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → btu (thermochemical) per hour square foot (BTU (th)/(h·ft²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → btu (it) per minute square foot (BTU (IT)/(min·ft²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → btu (thermochemical) per minute square foot (BTU (th)/(min·ft²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → btu (it) per second square foot (BTU (IT)/(s·ft²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → btu (thermochemical) per second square foot (BTU (th)/(s·ft²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → btu (thermochemical) per second square inch (BTU (th)/(s·in²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → kilocalorie (it) per hour square foot (kcal (IT)/(h·ft²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → chu per hour square foot (CHU/(h·ft²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → foot pound per minute square foot (ft·lbf/(min·ft²))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → horsepower per square foot (hp/ft²)btu (it) per hour square foot (BTU (IT)/(h·ft²)) → horsepower (metric) per square foot (hp (metric)/ft²)btu (it) per hour square foot (BTU (IT)/(h·ft²)) → dyne per hour centimeter (dyn/(h·cm))btu (it) per hour square foot (BTU (IT)/(h·ft²)) → erg per hour square millimeter (erg/(h·mm²))