Convert btu/hr·ft² to w/m²
1 btu (it) per hour ft² equals 3.1545907 watts per square meter. Enter a value below to convert instantly.
Multiply the number of btu (it) per hour ft² by 3.15459074506 to get watts per square meter. How this is calculated
Need the other direction? Convert watt per square meter to btu (it) per hour ft² →
Formula
Multiply the number of btu (it) per hour ft² by 3.15459074506 to get watts per square meter.
Step by step
- Start with 1 BTU/(h·ft²).
- Multiply by the conversion factor 3.15459074506.
- 1 × 3.15459074506 = 3.1545907 W/m².
BTU (IT) per Hour ft² to Watts per Square Meter conversion table
| BTU (IT) per Hour ft² (BTU/(h·ft²)) | Watts per Square Meter (W/m²) |
|---|---|
| 1 | 3.1545907 |
| 5 | 15.772954 |
| 10 | 31.545907 |
| 50 | 157.72954 |
| 100 | 315.45907 |
| 500 | 1,577.2954 |
| 1,000 | 3,154.5907 |
Convert BTU (IT) per Hour ft² to other heat flux density units
1 BTU/(h·ft²) expressed in every other heat flux density unit on this site.
- Watt per Square Meter W/m² 3.1545907
- Kilowatt per Square Meter kW/m² 0.0031545907
- Milliwatt per Square Meter mW/m² 3,154.5907
- Watt per Square Centimeter W/cm² 0.00031545907
- Watt per Square Inch W/in² 0.0020352158
- Watt per Square Foot W/ft² 0.29307107
- Kilocalorie (IT) per Hour m² kcal/(h·m²) 2.7124598
- Kilocalorie (IT) per Hour ft² kcal/(h·ft²) 0.25199576
- Calorie (IT) per Second cm² cal/(s·cm²) 0.000075346105
- BTU (IT) per Hour ft² BTU/(h·ft²) 1
- BTU (IT) per Minute ft² BTU/(min·ft²) 0.016666667
- BTU (IT) per Second ft² BTU/(s·ft²) 0.00027777778
- BTU (IT) per Second in² BTU/(s·in²) 0.0000019290123
- Erg per Second cm² erg/(s·cm²) 3,154.5907
- Horsepower per Square Foot hp/ft² 0.00039301478
- Horsepower (metric) per Square Foot PS/ft² 0.00039846576
- Calorie (IT) per Minute cm² cal/(min·cm²) 0.0045207663
- Calorie (IT) per Hour cm² cal/(h·cm²) 0.27124598
- Calorie (th) per Second cm² cal(th)/(s·cm²) 0.000075396528
- Calorie (th) per Minute cm² cal(th)/(min·cm²) 0.0045237917
- Calorie (th) per Hour cm² cal(th)/(h·cm²) 0.2714275
- Dyne per Hour Centimeter dyn/(h·cm) 11,356,527
- Erg per Hour mm² erg/(h·mm²) 113,565.27
- Foot-pound per Minute ft² ft·lbf/(min·ft²) 12.969488
- BTU (th) per Second in² BTU(th)/(s·in²) 0.0000019303033
- BTU (th) per Second ft² BTU(th)/(s·ft²) 0.00027796367
- BTU (th) per Minute ft² BTU(th)/(min·ft²) 0.01667782
- BTU (th) per Hour ft² BTU(th)/(h·ft²) 1.0006692
- CHU per Hour ft² CHU/(h·ft²) 0.55555556
About the btu (it) per hour ft²
The btu (it) per hour ft² (BTU/(h·ft²)) is a Imperial unit of heat flux density.
About the watt per square meter
The watt per square meter (W/m²) is a SI unit of heat flux density.
Where this conversion is used
Converting btu (it) per hour ft² to watts per square meter comes up when solar irradiance, building envelopes, and electronics cooling. Full midday sunlight is close to 1,000 W/m², a useful reference point when sizing panels or estimating solar gain.
Related conversions
Frequently asked questions
How many watts per square meter are in a btu (it) per hour ft²?
One btu (it) per hour ft² equals 3.1545907 watts per square meter.
How do you convert btu (it) per hour ft² to watts per square meter?
Multiply the number of btu (it) per hour ft² by 3.15459074506 to get watts per square meter.
What is 1 watt per square meter in btu (it) per hour ft²?
One watt per square meter equals 0.31699833 btu (it) per hour ft².
When would I convert btu (it) per hour ft² to watts per square meter?
This conversion is common when solar irradiance, building envelopes, and electronics cooling.
Conversion factors are based on internationally agreed unit definitions. See our methodology and sources for details on how these values are verified.