Work out void fill volume instantly with clear inputs, formula shown and shareable results.
Void volume is carton internal volume less product volume, and it costs twice: once for the void fill material and again in dimensional-weight freight charges. Void above about 40% of the carton usually means the box range needs an extra size rather than more air pillows.
Void volume
Void per carton = carton internal volume - product volume; monthly = void x shipments
Right-sizing almost always wins once dimensional-weight freight is included. Void fill is a remedy for a box range that is too coarse.
Enough to allow 25-50 mm of cushioning around fragile items, and near zero for robust products. A carton more than half empty is a specification failure, not a packing problem.