Heat Flux Density Converter
Convert between 9 heat flux density units instantly. Enter a value, pick your units and get the result with the formula, a full conversion table and worked examples.
1,000 BTU/(h·ft²) in all heat flux density units
Updates live as you type. Click a row to set it as the target unit.
| Unit | Symbol | Value |
|---|---|---|
| Milliwatt per sq metre | mW/m² | 3,154,590 |
| Erg per second sq centimetre | erg/(s·cm²) | 3,154,590 |
| Watt per sq metre | W/m² | 3,154.59 |
| Kilocalorie per hour sq metre | kcal/(h·m²) | 2,712.46 |
| BTU per hour sq foot | BTU/(h·ft²) | 1,000 |
| Kilowatt per sq metre | kW/m² | 3.15459 |
| Watt per sq centimetre | W/cm² | 0.315459 |
| BTU per second sq foot | BTU/(s·ft²) | 0.277778 |
| Calorie per second sq centimetre | cal/(s·cm²) | 0.0753461 |
How to Convert Heat Flux Density Units
Heat flux density is the rate of heat transfer per unit area. The SI unit is watt per square metre (W/m²); furnace, boiler and solar radiation calculations use it.
Every unit on this page is stored as a fixed factor relative to one reference unit, the watt per sq metre (W/m²). Converting is a two step multiply and divide:
- Multiply your value by the factor of the source unit to get the value in W/m².
- Divide that result by the factor of the target unit.
BTU per hour sq foot to Watt per sq metre conversion table
| BTU per hour sq foot (BTU/(h·ft²)) | Watt per sq metre (W/m²) |
|---|---|
| 1 BTU/(h·ft²) | 3.15459 W/m² |
| 2 BTU/(h·ft²) | 6.30918 W/m² |
| 3 BTU/(h·ft²) | 9.46377 W/m² |
| 4 BTU/(h·ft²) | 12.6184 W/m² |
| 5 BTU/(h·ft²) | 15.773 W/m² |
| 6 BTU/(h·ft²) | 18.9275 W/m² |
| 7 BTU/(h·ft²) | 22.0821 W/m² |
| 8 BTU/(h·ft²) | 25.2367 W/m² |
| 9 BTU/(h·ft²) | 28.3913 W/m² |
| 10 BTU/(h·ft²) | 31.5459 W/m² |
| 15 BTU/(h·ft²) | 47.3189 W/m² |
| 20 BTU/(h·ft²) | 63.0918 W/m² |
| 25 BTU/(h·ft²) | 78.8648 W/m² |
| 30 BTU/(h·ft²) | 94.6377 W/m² |
| 40 BTU/(h·ft²) | 126.184 W/m² |
| 50 BTU/(h·ft²) | 157.73 W/m² |
| 75 BTU/(h·ft²) | 236.594 W/m² |
| 100 BTU/(h·ft²) | 315.459 W/m² |
| 250 BTU/(h·ft²) | 788.648 W/m² |
| 500 BTU/(h·ft²) | 1,577.3 W/m² |
| 1,000 BTU/(h·ft²) | 3,154.59 W/m² |
Heat Flux Density Units and Conversion Factors
Value of one unit expressed in W/m².
| Unit | Symbol | In W/m² |
|---|---|---|
| Milliwatt per sq metre | mW/m² | 0.001 |
| Erg per second sq centimetre | erg/(s·cm²) | 0.001 |
| Watt per sq metre | W/m² | 1 |
| Kilocalorie per hour sq metre | kcal/(h·m²) | 1.163 |
| BTU per hour sq foot | BTU/(h·ft²) | 3.154590745 |
| Kilowatt per sq metre | kW/m² | 1,000 |
| Watt per sq centimetre | W/cm² | 10,000 |
| BTU per second sq foot | BTU/(s·ft²) | 11,356.52668 |
| Calorie per second sq centimetre | cal/(s·cm²) | 41,868 |
Frequently Asked Questions
What is the SI unit of heat flux density?
The SI unit of heat flux density is the watt per sq metre (W/m²). Heat flux density is the rate of heat transfer per unit area.
How do I convert W/m² to BTU/(h·ft²)?
To convert watt per sq metre (W/m²) to btu per hour sq foot (BTU/(h·ft²)), multiply the value in W/m² by 0.316998. For example, 1 W/m² = 0.316998 BTU/(h·ft²).
How do I convert BTU/(h·ft²) to W/m²?
To convert btu per hour sq foot (BTU/(h·ft²)) to watt per sq metre (W/m²), multiply the value in BTU/(h·ft²) by 3.15459. For example, 1 BTU/(h·ft²) = 3.15459 W/m².
How do I convert kcal/(h·m²) to W/m²?
To convert kilocalorie per hour sq metre (kcal/(h·m²)) to watt per sq metre (W/m²), multiply the value in kcal/(h·m²) by 1.163. For example, 1 kcal/(h·m²) = 1.163 W/m².
Can I see a value in every heat flux density unit at once?
Yes. Enter a value and choose the source unit; the "all units" table below the converter instantly lists the equivalent in all 9 supported units. Click any row to make it the target unit.
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