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Heat Transfer

BTU/(hr·ft²)toW/cm²

Convert British thermal units per hour-square foot (BTU/(hr·ft²)) to watts per square centimetre (W/cm²).

Factor1 BTU/(hr·ft²) = 0.0003154591 W/cm²

Converter

BTU/(hr·ft²)

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

Result
3.15459W/cm²

Rendered to 6 significant figures.

Formula

Formula
W/cm² = BTU/(hr·ft²) × 0.0003154591

Multiply any value in British thermal units per hour-square foot by 0.0003154591 to obtain the value in watts per square centimetre.

Worked example

Convert 10000 BTU/(hr·ft²) to W/cm².

  1. 01Start with 10000 BTU/(hr·ft²).
  2. 02Multiply by the conversion factor: 10000 × 0.0003154591 = 3.15459 W/cm².
Result10000 BTU/(hr·ft²) = 3.15459 W/cm²

Conversion table

BTU/(hr·ft²)W/cm²
10.00031546
20.00063092
50.0015773
100.0031546
200.0063092
500.015773
1000.031546
2000.063092
5000.15773
10000.31546

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/(hr·ft²) to W/cm²?
1 BTU/(hr·ft²) equals 0.0003154591 W/cm². To convert, multiply the value in British thermal units per hour-square foot by 0.0003154591.
How do I convert 1 BTU/(hr·ft²) to W/cm²?
1 BTU/(hr·ft²) = 0.000315459 W/cm². For any value, multiply by 0.0003154591.
How do I convert W/cm² back to BTU/(hr·ft²)?
Divide by the same factor — or equivalently, multiply by 3169.983. So 1 W/cm² = 3169.98 BTU/(hr·ft²).
When would I need to convert British thermal unit per hour-square foot to watt per square centimetre?
Heat-flux conversions between BTU/(hr·ft²) and W/cm² 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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