Convert watt/square metre to btu (it)/hour/square foot
Watt/Square Metre
The watt per square metre (W/m²) is the SI unit of heat flux density and irradiance. It represents the power transmitted per unit area. The solar constant (total solar irradiance) at Earth's orbit is approximately 1361 W/m². Used in heat transfer engineering, solar energy, and thermal radiation analysis.
Btu (IT)/Hour/Square Foot
The British thermal unit (IT) per hour per square foot (Btu/(h·ft²)) equals approximately 3.155 W/m² and is the most common imperial unit of heat flux in North American HVAC and building engineering. It is used for heat loss calculations, U-values, and thermal performance ratings of building envelopes.
Watt/Square Metre to Btu (IT)/Hour/Square Foot conversion table
| Watt/Square Metre | Btu (IT)/Hour/Square Foot | Btu (IT)/Hour/Square Foot | Watt/Square Metre |
|---|---|---|---|
| 1 | 0.316998 | 1 | 3.15459 |
| 2 | 0.633997 | 2 | 6.30918 |
| 3 | 0.950995 | 3 | 9.46377 |
| 5 | 1.58499 | 5 | 15.773 |
| 10 | 3.16998 | 10 | 31.5459 |
| 20 | 6.33997 | 20 | 63.0918 |
| 25 | 7.92496 | 25 | 78.8648 |
| 50 | 15.8499 | 50 | 157.73 |
| 100 | 31.6998 | 100 | 315.459 |
| 250 | 79.2496 | 250 | 788.648 |
| 500 | 158.499 | 500 | 1577.3 |
| 1000 | 316.998 | 1000 | 3154.59 |
How to convert Watt/Square Metre to Btu (IT)/Hour/Square Foot
1 W/m² = 0.316998 Btu/(h·ft²). To convert any value, multiply it by 0.316998. For example, 25 W/m² = 7.92496 Btu/(h·ft²).
Frequently asked questions
- How many Btu/(h·ft²) are there in one W/m²?
- One W/m² is equal to 0.316998 Btu/(h·ft²).
- How do you convert Watt/Square Metre to Btu (IT)/Hour/Square Foot?
- Multiply the value in Watt/Square Metre by 0.316998 to get the result in Btu (IT)/Hour/Square Foot.
- How much is 25 W/m² in Btu/(h·ft²)?
- 25 W/m² is equal to 7.92496 Btu/(h·ft²).
- How do you convert Btu (IT)/Hour/Square Foot back to Watt/Square Metre?
- Divide by the same factor: multiply the value in Btu (IT)/Hour/Square Foot by 3.15459 to get Watt/Square Metre.