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The parallel axes rule also applies to the [[second moment of area]] (area moment of inertia);
:<math>I_z = I_x + Ad^2.\,</math>
where ''I<sub>z</sub>'' is the area moment of inertia through the parallel axis, ''I<sub>x</sub>'' is the area moment of inertia through the center of mass of the [[area]], ''A'' is the surface of the area, and ''d'' is the distance from the new axis ''z'' to the center of gravity of the area.
The parallel axes rule is one of few theorems referred to as '''Steiner's theorem''', after [[Jakob Steiner]].
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