▸ processconvert
Heat Transfer

W/m²tokBTU/(hr·ft²)

Convert watts per square metre (W/m²) to kilo-British thermal units per hour-square foot (kBTU/(hr·ft²)).

Factor1 W/m² = 0.0003169983 kBTU/(hr·ft²)

Converter

W/m²

Accepts numbers or expressions, e.g. 150 + 14.7

Result
3.16998kBTU/(hr·ft²)

Rendered to 6 significant figures.

Formula

Formula
kBTU/(hr·ft²) = W/m² × 0.0003169983

Multiply any value in watts per square metre by 0.0003169983 to obtain the value in kilo-British thermal units per hour-square foot.

Worked example

Convert 10000 W/m² to kBTU/(hr·ft²).

  1. 01Start with 10000 W/m².
  2. 02Multiply by the conversion factor: 10000 × 0.0003169983 = 3.16998 kBTU/(hr·ft²).
Result10000 W/m² = 3.16998 kBTU/(hr·ft²)

Conversion table

W/m²kBTU/(hr·ft²)
10.000317
20.000634
50.001585
100.00317
200.00634
500.01585
1000.0317
2000.0634
5000.1585
10000.317

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from W/m² to kBTU/(hr·ft²)?
1 W/m² equals 0.0003169983 kBTU/(hr·ft²). To convert, multiply the value in watts per square metre by 0.0003169983.
How do I convert 1 W/m² to kBTU/(hr·ft²)?
1 W/m² = 0.000316998 kBTU/(hr·ft²). For any value, multiply by 0.0003169983.
How do I convert kBTU/(hr·ft²) back to W/m²?
Divide by the same factor — or equivalently, multiply by 3154.591. So 1 kBTU/(hr·ft²) = 3154.59 W/m².
When would I need to convert watt per square metre to kilo-British thermal unit per hour-square foot?
Heat-flux conversions between W/m² and kBTU/(hr·ft²) appear in radiative-heat-transfer analysis, furnace and reactor design, electronics cooling, and solar-energy calculations. W/m² is the SI standard; BTU/(hr·ft²) and kcal/(hr·m²) appear in US and legacy European datasheets.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

Related conversions