
Area Conversions 
Area is commonly
described as the extent of a twodimensional surface enclosed within a specified boundary. Calculating area is
fairly straight forward for welldefined regions, like regular polygons and symmetrical circles and ellipses.
Finding the area for irregular regions requires the application of calculus. In fact, it is with the assistance of
calculus that even a common formula like for the area of an ellipse is derived.
Below is a table of commonly used area conversion factors.
Standard units = Square centimeter (cm^{2}) for metric Square
inch (ft^{2}) for SAE
1 in^{2} = 
1 
6.944 · 10^{3} 
6.452 
6.452 · 10^{4} 
1.273 · 10^{6} 
1 ft^{2} = 
144 
1 
929.0 
9.290 · 10^{2} 
1.833 · 10^{8} 
1 cm^{2} = 
0.1550 
1.076 · 10^{3} 
1 
10^{4} 
1.974 · 10^{5} 
1 m^{2} = 
1550 
10.76 
10^{4} 
1 
1.974 · 10^{9} 
1 cir mil = 
7.854 · 10^{7} 
5.454 · 10^{3} 
5.067 · 10^{6} 
5.067 · 10^{10} 
1 



