Convert watt per square meter to btu (it) per hour square foot instantly. Type in either field — results update live.
Selected W/m² values converted to BTU (IT)/(h·ft²) using the exact factor from this tool.
| W/m² | BTU (IT)/(h·ft²) |
|---|---|
| 0.01 | 0.0031699829 |
| 0.1 | 0.0316998286 |
| 1 | 0.3169982863 |
| 2 | 0.6339965726 |
| 3 | 0.950994859 |
| 5 | 1.5849914316 |
| 10 | 3.1699828632 |
| 20 | 6.3399657264 |
| 50 | 15.849914316 |
| 100 | 31.6998286319 |
| 1,000 | 316.9982863193 |
Exact conversion factors in both directions, plus a worked example.
1 W/m² = 0.3169982863 BTU (IT)/(h·ft²)
1 BTU (IT)/(h·ft²) = 3.154591186 W/m²
To convert watt per square meter to btu (it) per hour square foot, multiply by 0.3169982863.
To convert btu (it) per hour square foot to watt per square meter, multiply by 3.154591186.
Example: convert 10 W/m² to BTU (IT)/(h·ft²)
10 × 0.3169982863 = 3.1699828632 BTU (IT)/(h·ft²)
Short background on the units used in this conversion.
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.
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)/(h·ft²) = W/m² × 0.3169982863W/m² = BTU (IT)/(h·ft²) × 3.154591186, using the same exact factors as this converter.Jump to any heat flux density conversion starting from watt per square meter — including the reverse direction and every other unit in our dataset.