Watts per Square Meter to BTU per Hour per Square Foot Converter
Convert W/m² to BTU/(ft²·h) instantly. 1 W/m² = 0.3169983306 BTU/(ft²·h).
Conversion Formula
BTU/(ft²·h) = W/m² × 0.3169983306
Example
25 W/m² × 0.3169983306 = 7.924958266 BTU/(ft²·h)
Convert the other way: BTU per Hour per Square Foot to Watts per Square Meter →
Watts per Square Meter to BTU per Hour per Square Foot Conversion Table
| Watts per Square Meter (W/m²) | BTU per Hour per Square Foot (BTU/(ft²·h)) |
|---|---|
| 0.1 | 0.03169983306 |
| 0.5 | 0.1584991653 |
| 1 | 0.3169983306 |
| 2 | 0.6339966613 |
| 5 | 1.584991653 |
| 10 | 3.169983306 |
| 20 | 6.339966613 |
| 25 | 7.924958266 |
| 50 | 15.84991653 |
| 100 | 31.69983306 |
| 500 | 158.4991653 |
| 1,000 | 316.9983306 |
About These Units
- Watts per Square Meter (W/m²)
- The SI unit of heat flux and irradiance, one watt passing through each square meter. Solar panel ratings assume 1,000 W/m² of sunlight, and building and climate science calculations use it throughout.
- BTU per Hour per Square Foot (BTU/(ft²·h))
- A US customary unit of heat flux, one British thermal unit per hour through each square foot, about 3.1546 W/m². It is used in American building, furnace, and heat exchanger calculations.
Frequently Asked Questions
How many BTU/(ft²·h) are in 1 W/m²?
1 W/m² equals 0.3169983306 BTU/(ft²·h).
How do I convert Watts per Square Meter to BTU per Hour per Square Foot?
Multiply your Watts per Square Meter value by 0.3169983306. For example, 25 W/m² × 0.3169983306 = 7.924958266 BTU/(ft²·h).
How many W/m² are in 1 BTU/(ft²·h)?
1 BTU/(ft²·h) equals 3.154590745 W/m².