Convert btu (it)/hour/square foot to watt/square metre
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
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 to Watt/Square Metre conversion table
| Btu (IT)/Hour/Square Foot | Watt/Square Metre | Watt/Square Metre | Btu (IT)/Hour/Square Foot |
|---|---|---|---|
| 1 | 3.15459 | 1 | 0.316998 |
| 2 | 6.30918 | 2 | 0.633997 |
| 3 | 9.46377 | 3 | 0.950995 |
| 5 | 15.773 | 5 | 1.58499 |
| 10 | 31.5459 | 10 | 3.16998 |
| 20 | 63.0918 | 20 | 6.33997 |
| 25 | 78.8648 | 25 | 7.92496 |
| 50 | 157.73 | 50 | 15.8499 |
| 100 | 315.459 | 100 | 31.6998 |
| 250 | 788.648 | 250 | 79.2496 |
| 500 | 1577.3 | 500 | 158.499 |
| 1000 | 3154.59 | 1000 | 316.998 |
How to convert Btu (IT)/Hour/Square Foot to Watt/Square Metre
1 Btu/(h·ft²) = 3.15459 W/m². To convert any value, multiply it by 3.15459. For example, 25 Btu/(h·ft²) = 78.8648 W/m².
Frequently asked questions
- How many W/m² are there in one Btu/(h·ft²)?
- One Btu/(h·ft²) is equal to 3.15459 W/m².
- How do you convert Btu (IT)/Hour/Square Foot to Watt/Square Metre?
- Multiply the value in Btu (IT)/Hour/Square Foot by 3.15459 to get the result in Watt/Square Metre.
- How much is 25 Btu/(h·ft²) in W/m²?
- 25 Btu/(h·ft²) is equal to 78.8648 W/m².
- How do you convert Watt/Square Metre back to Btu (IT)/Hour/Square Foot?
- Divide by the same factor: multiply the value in Watt/Square Metre by 0.316998 to get Btu (IT)/Hour/Square Foot.