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Heat Transfer

BTU/(hr·ft²·°F)tokcal/(hr·m²·°C)

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

Factor1 BTU/(hr·ft²·°F) = 4.882428 kcal/(hr·m²·°C)

Converter

BTU/(hr·ft²·°F)

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

Result
48.8243kcal/(hr·m²·°C)

Rendered to 6 significant figures.

Formula

Formula
kcal/(hr·m²·°C) = BTU/(hr·ft²·°F) × 4.882428

Multiply any value in British thermal units per hour-square foot-Fahrenheit by 4.882428 to obtain the value in kilocalories per hour-square metre-Celsius.

Worked example

Convert 10 BTU/(hr·ft²·°F) to kcal/(hr·m²·°C).

  1. 01Start with 10 BTU/(hr·ft²·°F).
  2. 02Multiply by the conversion factor: 10 × 4.882428 = 48.8243 kcal/(hr·m²·°C).
Result10 BTU/(hr·ft²·°F) = 48.8243 kcal/(hr·m²·°C)

Conversion table

BTU/(hr·ft²·°F)kcal/(hr·m²·°C)
14.8824
29.7649
524.412
1048.824
2097.649
50244.12
100488.24
200976.49
5002441.2
10004882.4

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/(hr·ft²·°F) to kcal/(hr·m²·°C)?
1 BTU/(hr·ft²·°F) equals 4.882428 kcal/(hr·m²·°C). To convert, multiply the value in British thermal units per hour-square foot-Fahrenheit by 4.882428.
How do I convert 1 BTU/(hr·ft²·°F) to kcal/(hr·m²·°C)?
1 BTU/(hr·ft²·°F) = 4.88243 kcal/(hr·m²·°C). For any value, multiply by 4.882428.
How do I convert kcal/(hr·m²·°C) back to BTU/(hr·ft²·°F)?
Divide by the same factor — or equivalently, multiply by 0.2048161. So 1 kcal/(hr·m²·°C) = 0.204816 BTU/(hr·ft²·°F).
When would I need to convert British thermal unit per hour-square foot-Fahrenheit to kilocalorie per hour-square metre-Celsius?
Heat-transfer coefficient conversions between BTU/(hr·ft²·°F) and kcal/(hr·m²·°C) are needed in heat-exchanger sizing, boiler and condenser design, and HVAC calculations. W/(m²·K) is standard in SI engineering, and BTU/(hr·ft²·°F) is common in US heat-exchanger correlations and vendor literature.
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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