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Heat Transfer

BTU/(hr·ft²)tokcal/(hr·m²)

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

Factor1 BTU/(hr·ft²) = 2.71246 kcal/(hr·m²)

Converter

BTU/(hr·ft²)

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

Result
271.246kcal/(hr·m²)

Rendered to 6 significant figures.

Formula

Formula
kcal/(hr·m²) = BTU/(hr·ft²) × 2.71246

Multiply any value in British thermal units per hour-square foot by 2.71246 to obtain the value in kilocalories per hour-square metre.

Worked example

Convert 100 BTU/(hr·ft²) to kcal/(hr·m²).

  1. 01Start with 100 BTU/(hr·ft²).
  2. 02Multiply by the conversion factor: 100 × 2.71246 = 271.246 kcal/(hr·m²).
Result100 BTU/(hr·ft²) = 271.246 kcal/(hr·m²)

Conversion table

BTU/(hr·ft²)kcal/(hr·m²)
12.7125
25.4249
513.562
1027.125
2054.249
50135.62
100271.25
200542.49
5001356.2
10002712.5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/(hr·ft²) to kcal/(hr·m²)?
1 BTU/(hr·ft²) equals 2.71246 kcal/(hr·m²). To convert, multiply the value in British thermal units per hour-square foot by 2.71246.
How do I convert 1 BTU/(hr·ft²) to kcal/(hr·m²)?
1 BTU/(hr·ft²) = 2.71246 kcal/(hr·m²). For any value, multiply by 2.71246.
How do I convert kcal/(hr·m²) back to BTU/(hr·ft²)?
Divide by the same factor — or equivalently, multiply by 0.3686691. So 1 kcal/(hr·m²) = 0.368669 BTU/(hr·ft²).
When would I need to convert British thermal unit per hour-square foot to kilocalorie per hour-square metre?
Heat-flux conversions between BTU/(hr·ft²) and kcal/(hr·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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