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Heat Transfer

kJ/(h·m²·K)toBTU/(hr·ft²·°F)

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

Factor1 kJ/(h·m²·K) = 0.0489195 BTU/(hr·ft²·°F)

Converter

kJ/(h·m²·K)

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

Result
4.89195BTU/(hr·ft²·°F)

Rendered to 6 significant figures.

Formula

Formula
BTU/(hr·ft²·°F) = kJ/(h·m²·K) × 0.0489195

Multiply any value in kilojoules per hour-square metre-kelvin by 0.0489195 to obtain the value in British thermal units per hour-square foot-Fahrenheit.

Worked example

Convert 100 kJ/(h·m²·K) to BTU/(hr·ft²·°F).

  1. 01Start with 100 kJ/(h·m²·K).
  2. 02Multiply by the conversion factor: 100 × 0.0489195 = 4.89195 BTU/(hr·ft²·°F).
Result100 kJ/(h·m²·K) = 4.89195 BTU/(hr·ft²·°F)

Conversion table

kJ/(h·m²·K)BTU/(hr·ft²·°F)
10.048919
20.097839
50.2446
100.48919
200.97839
502.446
1004.8919
2009.7839
50024.46
100048.919

Reference values rounded to 5 significant figures for display.

FAQ

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