Convert BTU per Hour Square Foot to Watts per Square Meter
1 btu per hour square foot = 3.1545907 watts per square meter. Multiply the number of btu per hour square foot by 3.15459074506.
1 BTU/(h·ft²) = 3.154590745 W/m²
Multiply the number of btu per hour square foot by 3.15459074506.
Results are rounded for display. Double-check values for critical work.
Popular heat flux density conversions
BTU per Hour Square Foot to Watts per Square Meter table
| BTU per Hour Square Foot | Watts per Square Meter |
|---|---|
| 1 BTU/(h·ft²) | 3.1545907 W/m² |
| 2 BTU/(h·ft²) | 6.3091815 W/m² |
| 3 BTU/(h·ft²) | 9.4637722 W/m² |
| 4 BTU/(h·ft²) | 12.618363 W/m² |
| 5 BTU/(h·ft²) | 15.772954 W/m² |
| 10 BTU/(h·ft²) | 31.545907 W/m² |
| 20 BTU/(h·ft²) | 63.091815 W/m² |
| 25 BTU/(h·ft²) | 78.864769 W/m² |
| 50 BTU/(h·ft²) | 157.72954 W/m² |
| 100 BTU/(h·ft²) | 315.45907 W/m² |
| 500 BTU/(h·ft²) | 1,577.2954 W/m² |
| 1000 BTU/(h·ft²) | 3,154.5907 W/m² |
BTU per Hour Square Foot to Watts per Square Meter in your head
Multiply by 16, then divide by 5.
That lands within 1% of the exact value.
10 BTU/(h·ft²) → 32 W/m² in your head, 31.5459 W/m² exactly.
About these units
The btu per hour square foot (BTU/(h·ft²)) is an imperial unit of heat flux density, equal to 3.1545907 watts per square meter.
The watt per square meter (W/m²) is an SI base or derived unit of heat flux density.
Going the other way, 1 watt per square meter = 0.31699833 btu per hour square foot. Heat flux density is power per unit area: the heat escaping through a wall, the output of a radiant panel, or sunlight on a roof, which peaks near 1,000 W/m². Building services engineers switch between W/m² and BTU/(h·ft²) constantly.
Frequently asked
- How many watts per square meter are in a btu per hour square foot?
- 1 btu per hour square foot = 3.1545907 watts per square meter.
- How do you convert btu per hour square foot to watts per square meter?
- Multiply the number of btu per hour square foot by 3.15459074506.
- What is 10 BTU/(h·ft²) in W/m²?
- 10 BTU/(h·ft²) = 31.545907 W/m².