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Heat Transfer

BTU/(hr·ft²)toMW/m²

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

Factor1 BTU/(hr·ft²) = 3.154591e-6 MW/m²

Converter

BTU/(hr·ft²)

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

Result
3.15459MW/m²

Rendered to 6 significant figures.

Formula

Formula
MW/m² = BTU/(hr·ft²) × 3.154591e-6

Multiply any value in British thermal units per hour-square foot by 3.154591e-6 to obtain the value in megawatts per square metre.

Worked example

Convert 1.00000e+6 BTU/(hr·ft²) to MW/m².

  1. 01Start with 1.00000e+6 BTU/(hr·ft²).
  2. 02Multiply by the conversion factor: 1.00000e+6 × 3.154591e-6 = 3.15459 MW/m².
Result1.00000e+6 BTU/(hr·ft²) = 3.15459 MW/m²

Conversion table

BTU/(hr·ft²)MW/m²
13.1546e-6
26.3092e-6
51.5773e-5
103.1546e-5
206.3092e-5
500.00015773
1000.00031546
2000.00063092
5000.0015773
10000.0031546

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/(hr·ft²) to MW/m²?
1 BTU/(hr·ft²) equals 3.154591e-6 MW/m². To convert, multiply the value in British thermal units per hour-square foot by 3.154591e-6.
How do I convert 1 BTU/(hr·ft²) to MW/m²?
1 BTU/(hr·ft²) = 3.15459e-6 MW/m². For any value, multiply by 3.154591e-6.
How do I convert MW/m² back to BTU/(hr·ft²)?
Divide by the same factor — or equivalently, multiply by 316998.3. So 1 MW/m² = 316998 BTU/(hr·ft²).
When would I need to convert British thermal unit per hour-square foot to megawatt per square metre?
Heat-flux conversions between BTU/(hr·ft²) and MW/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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