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Heat Transfer

BTU/(hr·ft²)tokW/m²

Convert British thermal units per hour-square foot (BTU/(hr·ft²)) to kilowatts per square metre (kW/m²).

Factor1 BTU/(hr·ft²) = 0.003154591 kW/m²

Converter

BTU/(hr·ft²)

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

Result
3.15459kW/m²

Rendered to 6 significant figures.

Formula

Formula
kW/m² = BTU/(hr·ft²) × 0.003154591

Multiply any value in British thermal units per hour-square foot by 0.003154591 to obtain the value in kilowatts per square metre.

Worked example

Convert 1000 BTU/(hr·ft²) to kW/m².

  1. 01Start with 1000 BTU/(hr·ft²).
  2. 02Multiply by the conversion factor: 1000 × 0.003154591 = 3.15459 kW/m².
Result1000 BTU/(hr·ft²) = 3.15459 kW/m²

Conversion table

BTU/(hr·ft²)kW/m²
10.0031546
20.0063092
50.015773
100.031546
200.063092
500.15773
1000.31546
2000.63092
5001.5773
10003.1546

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/(hr·ft²) to kW/m²?
1 BTU/(hr·ft²) equals 0.003154591 kW/m². To convert, multiply the value in British thermal units per hour-square foot by 0.003154591.
How do I convert 1 BTU/(hr·ft²) to kW/m²?
1 BTU/(hr·ft²) = 0.00315459 kW/m². For any value, multiply by 0.003154591.
How do I convert kW/m² back to BTU/(hr·ft²)?
Divide by the same factor — or equivalently, multiply by 316.9983. So 1 kW/m² = 316.998 BTU/(hr·ft²).
When would I need to convert British thermal unit per hour-square foot to kilowatt per square metre?
Heat-flux conversions between BTU/(hr·ft²) and kW/m² 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).

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