Convert joule/square metre to btu (th)/square foot

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Joule/Square Metre

The joule per square metre (J/m²) is the SI unit of radiant exposure or heat density. It represents the total energy incident on or passing through a unit area. Used in solar radiation measurements, laser energy delivery, and thermal analysis to quantify energy flux integrated over time. 


Btu (th)/Square Foot

The thermochemical British thermal unit per square foot (Btu(th)/ft²) uses the thermochemical BTU (1054.35 J) to express heat density. Slightly different from the IT version, it is applied in thermochemical research and precise calorimetric measurements of radiant heat exposure. 


Joule/Square Metre to Btu (th)/Square Foot conversion table
Joule/Square MetreBtu (th)/Square FootBtu (th)/Square FootJoule/Square Metre
18.811E-05111348.9
20.0001762222697.9
30.0002643334046.8
50.0004406556744.7
100.000881110113489
200.0017622820226979
250.0022028525283723
500.004405750567447
1000.00881141001.13489E+06
2500.02202852502.83723E+06
5000.0440575005.67447E+06
10000.08811410001.13489E+07
How to convert Joule/Square Metre to Btu (th)/Square Foot

1 J/m² = 8.811E-05 Btu(th)/ft². To convert any value, multiply it by 8.811E-05. For example, 25 J/m² = 0.00220285 Btu(th)/ft².

Frequently asked questions
How many Btu(th)/ft² are there in one J/m²?
One J/m² is equal to 8.811E-05 Btu(th)/ft².
How do you convert Joule/Square Metre to Btu (th)/Square Foot?
Multiply the value in Joule/Square Metre by 8.811E-05 to get the result in Btu (th)/Square Foot.
How much is 25 J/m² in Btu(th)/ft²?
25 J/m² is equal to 0.00220285 Btu(th)/ft².
How do you convert Btu (th)/Square Foot back to Joule/Square Metre?
Divide by the same factor: multiply the value in Btu (th)/Square Foot by 11348.9 to get Joule/Square Metre.

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