You don't. Cubic inches is a measure of volume and square inches is a measure of area.
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Inches cubed x 16.387 = cm cubed
1 Foot = 12 Inches 1 Sq. Foot = 12 Inches Cubed.
1 milliliters = 0.0610237441 inches cubed
Multiply the cubic inches by 16387.064
2.3 cubic feet = 3,974.4 cubic inches