How to convert watts per square meter to BTU per hour square foot
BTU/(h⋅ft²) = W/m² × 0.3169983306Multiply the value in watts per square meter by 0.3169983306. To go the other way, multiply by 3.154590745 (or divide by 0.3169983306).
A watt per square meter is smaller than a BTU per hour square foot: it takes 3.154590745 watts per square meter to make one BTU per hour square foot.
Worked examples
- 1 watt per square meter1 W/m² × 0.3169983306 = 0.3169983306 BTU/(h⋅ft²)
- 5 watts per square meter5 W/m² × 0.3169983306 = 1.584991653 BTU/(h⋅ft²)
- 10 watts per square meter10 W/m² × 0.3169983306 = 3.169983306 BTU/(h⋅ft²)
- 20 watts per square meter20 W/m² × 0.3169983306 = 6.339966613 BTU/(h⋅ft²)
- 100 watts per square meter100 W/m² × 0.3169983306 = 31.69983306 BTU/(h⋅ft²)
Watts per square meter to BTU per hour square foot conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Watts per square meter (W/m²) | BTU per hour square foot (BTU/(h⋅ft²)) |
|---|---|
| 0.1 W/m² | 0.031699833 BTU/(h⋅ft²) |
| 0.25 W/m² | 0.079249583 BTU/(h⋅ft²) |
| 0.5 W/m² | 0.15849917 BTU/(h⋅ft²) |
| 1 W/m² | 0.31699833 BTU/(h⋅ft²) |
| 2 W/m² | 0.63399666 BTU/(h⋅ft²) |
| 3 W/m² | 0.95099499 BTU/(h⋅ft²) |
| 4 W/m² | 1.2679933 BTU/(h⋅ft²) |
| 5 W/m² | 1.5849917 BTU/(h⋅ft²) |
| 6 W/m² | 1.90199 BTU/(h⋅ft²) |
| 7 W/m² | 2.2189883 BTU/(h⋅ft²) |
| 8 W/m² | 2.5359866 BTU/(h⋅ft²) |
| 9 W/m² | 2.852985 BTU/(h⋅ft²) |
| 10 W/m² | 3.1699833 BTU/(h⋅ft²) |
| Watts per square meter (W/m²) | BTU per hour square foot (BTU/(h⋅ft²)) |
|---|---|
| 12 W/m² | 3.80398 BTU/(h⋅ft²) |
| 15 W/m² | 4.754975 BTU/(h⋅ft²) |
| 20 W/m² | 6.3399666 BTU/(h⋅ft²) |
| 25 W/m² | 7.9249583 BTU/(h⋅ft²) |
| 30 W/m² | 9.5099499 BTU/(h⋅ft²) |
| 40 W/m² | 12.679933 BTU/(h⋅ft²) |
| 50 W/m² | 15.849917 BTU/(h⋅ft²) |
| 75 W/m² | 23.774875 BTU/(h⋅ft²) |
| 100 W/m² | 31.699833 BTU/(h⋅ft²) |
| 250 W/m² | 79.249583 BTU/(h⋅ft²) |
| 500 W/m² | 158.49917 BTU/(h⋅ft²) |
| 1,000 W/m² | 316.99833 BTU/(h⋅ft²) |
About the units
Watt per square meter (W/m²)
The watt per square meter (W/m²) is a unit of heat flux density in the International System of Units (SI).
BTU per hour square foot (BTU/(h⋅ft²))
The BTU per hour square foot (BTU/(h⋅ft²)) is a unit of heat flux density in the US customary system. One BTU per hour square foot equals 3.154590745 watts per square meter (W/m²).
Frequently asked questions
How many BTU per hour square foot are in one watt per square meter?
There are 0.3169983306 BTU per hour square foot in one watt per square meter, and this value is exact by definition.
How do I convert watts per square meter to BTU per hour square foot?
Multiply the number of watts per square meter by 0.3169983306. For example, 10 W/m² × 0.3169983306 = 3.169983306 BTU/(h⋅ft²).
How many watts per square meter are in one BTU per hour square foot?
One BTU per hour square foot equals 3.154590745 watts per square meter. That is the reverse factor, 1 ÷ 0.3169983306.
What is 10 watts per square meter in BTU per hour square foot?
10 W/m² = 3.169983306 BTU/(h⋅ft²).
Is this W/m² to BTU/(h⋅ft²) converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.