How do you go from mm squared to feet squared?

Answer 1

To change millimeters squared to inches squared:

We will let ~ stand for "approximately equal to".

First know that 1 mm ~ 0.0393701 inches. This actually comes from 1 in = 25.4 mm.

Therefore your conversion factor could be

(1 mm)2 ~ (0.0393701 in)2 or

(1 mm)2 ~ 0.00155 in2

But a much easier one is:

1 in2 = 645.16 mm2

This one is exactly equal, so let's use it.

Example:

Convert 322.58 mm2 to square inches.

Answer:

Multiply your known number by the factor to change it to the new units:

(322.58 mm2) (1 in2/645.16 mm2) = 0.5 in2, or half a square inch.