How do you convert one unit of area to another

For example millimetres^2 into feet^2 or meters^2

Also the same for millimeters^3 into feet^3

if 25.4mm = 1" then (25.4)^2 cm^2 = 1 square inch and (25.4)^3 mm^3 = 1 cubic inch

1000mm = 1 m so 1000000mm^2 = 1 m^2 and 1000000000mm^3 = 1 m^3

1 foot = 0.3048 m = 304.8mm, so 28316846.59mm^3 = 1 cubic foot.

1.54mm = 1inch (1/12ft)
(1.54mm)^2 = (1/12 ft)^2
2.732mm^2 = 6.94 x 10^-3 ft^2
1mm^2 = (6.94 x 10^-3)2.732 = 2.542 x 10^-3ft^2