How to Choose the Right Box Size for Every Shipment

Measure the Product

Measure the item at its longest, widest, and tallest points, including any parts that stick out. That gives you the smallest rectangle the product needs.

Add Room for Protection

Add space on each side for cushioning. Fragile items need more; sturdy items packed snugly need less. The result is the minimum interior box size. Box sizes are listed as interior length x width x height.

Mind Dimensional Weight

Many carriers charge by the greater of actual weight and dimensional weight, which is based on box volume. An oversized box can cost more to ship even when the contents are light. Carriers set their own DIM factors and update them, so check current rates.

Consolidate Your Sizes

Look at your most-shipped products and find a small set of box sizes that cover most of them. Fewer sizes are easier to stock and reorder, whether new or used.

Match Strength to Weight

Size is only half the decision. Check that the board grade suits the weight and stacking the box will see. See our box grades guide for how ratings work.