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Heat Transfer

BTU/(hr·ft²·°F)tokJ/(h·m²·K)

Convert British thermal units per hour-square foot-Fahrenheit (BTU/(hr·ft²·°F)) to kilojoules per hour-square metre-kelvin (kJ/(h·m²·K)).

Factor1 BTU/(hr·ft²·°F) = 20.44175 kJ/(h·m²·K)

Converter

BTU/(hr·ft²·°F)

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

Result
20.4417kJ/(h·m²·K)

Rendered to 6 significant figures.

Formula

Formula
kJ/(h·m²·K) = BTU/(hr·ft²·°F) × 20.44175

Multiply any value in British thermal units per hour-square foot-Fahrenheit by 20.44175 to obtain the value in kilojoules per hour-square metre-kelvin.

Worked example

Convert 1 BTU/(hr·ft²·°F) to kJ/(h·m²·K).

  1. 01Start with 1 BTU/(hr·ft²·°F).
  2. 02Multiply by the conversion factor: 1 × 20.44175 = 20.4417 kJ/(h·m²·K).
Result1 BTU/(hr·ft²·°F) = 20.4417 kJ/(h·m²·K)

Conversion table

BTU/(hr·ft²·°F)kJ/(h·m²·K)
120.442
240.883
5102.21
10204.42
20408.83
501022.1
1002044.2
2004088.3
50010221
100020442

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/(hr·ft²·°F) to kJ/(h·m²·K)?
1 BTU/(hr·ft²·°F) equals 20.44175 kJ/(h·m²·K). To convert, multiply the value in British thermal units per hour-square foot-Fahrenheit by 20.44175.
How do I convert 1 BTU/(hr·ft²·°F) to kJ/(h·m²·K)?
1 BTU/(hr·ft²·°F) = 20.4417 kJ/(h·m²·K). For any value, multiply by 20.44175.
How do I convert kJ/(h·m²·K) back to BTU/(hr·ft²·°F)?
Divide by the same factor — or equivalently, multiply by 0.0489195. So 1 kJ/(h·m²·K) = 0.0489195 BTU/(hr·ft²·°F).
When would I need to convert British thermal unit per hour-square foot-Fahrenheit to kilojoule per hour-square metre-kelvin?
Heat-transfer coefficient conversions between BTU/(hr·ft²·°F) and kJ/(h·m²·K) 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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