Moment of Inertia of Primary Member is usually measured using the Millimeter⁴ per Millimeter[mm⁴/mm] for Moment of Inertia per Unit Length. Meter⁴ per Meter[mm⁴/mm], Centimeter⁴ per Micrometer[mm⁴/mm], Centimeter⁴ per Centimeter[mm⁴/mm] are the few other units in which Moment of Inertia of Primary Member can be measured.