What this calculator answers
How much unused space is left after the product sits in the box?
Formula
Void (cu in) = (box L × W × H) − (product L × W × H). Divide by 1,728 for cubic feet.
Limitations
Ignores irregular shapes. Does not output bag counts.
Related decisions
Void fill guide for material choice. Tighten the carton with box size, then add unit cost in packaging cost.