FREE WEB TOOL

Leftover return box estimator

Estimate return shipping boxes for unsold books.

Use tool

How to use it

Estimate return-box count for leftover books after an event from copy count, book thickness, copies per layer and internal box height. It is a simple stacking estimate rather than a full 3D packing calculation.

  1. Enter the remaining copy count as a whole number of 0 or more.
  2. Enter thickness per copy in mm and whole copies per layer.
  3. Enter internal box height in mm and calculate capacity and box count.
Layers
internal height ÷ book thickness, rounded down
Capacity
copies per layer × layers
Boxes
remaining copies ÷ capacity, rounded up
Assumption
same-size books stacked in the same orientation

70 copies, 5 mm thick, 10 per layer and 250 mm high fits in 1 box by the model

250 ÷ 5 gives 50 layers; at 10 copies per layer, theoretical capacity is 500 copies, so 70 copies produces a one-box estimate.

The model only handles vertical stacking. Book footprint, box base dimensions, weight limits, padding and carton strength must be checked separately.

You provide the copies-per-layer value

The tool does not infer how A5 or B5 books fit the box floor. Measure or estimate how many copies fit in one horizontal layer first.

Partial layers are not counted

If the internal height is not an exact multiple of book thickness, the leftover height is ignored rather than treated as another layer.

Zero leftovers means zero boxes

Use an actual whole-number copy count. Fractional books are not meaningful for this estimate.

Weight can become the real limit first

Paper is dense, so a box that fits many books by volume may exceed carrier limits or become unsafe to lift. Check weight separately.

Leave practical handling space

Padding and a small top gap can protect books and make unpacking easier. A mathematically full box is not always the best physical packing choice.

Related references: Paper sizes · DPI, PPI & px · Aspect ratios