Heat per Unit Area (HPA) unitsUse the following table to convert among various units. To convert from the units in a column to the units in a row, divide by the conversion factor. To convert from the units in a row to the units in a column, multiply by the conversion factor. Four significant figures are shown. Only half the table is provided to avoid roundoff errors. 

J/ft2 
kJ/m2 
BTU/ft2 
kcal/m2 
cal/m2 
J/ft2 
1 




kJ/m2 
92.90 
1 



BTU/ft2 
1055 
11.35 
1 


kcal/m2 
388.9 
4.183 
0.3686 
1 

cal/cm2 
3889 
41.83 
3.686 
10 
1 
Examples: multiply 2000 BTU/ft2 by 11.35 to get 22,700 kJ/m2; divide 20,000 kJ/m2 by 11.35 to get 1762 BTU/ft2.
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