Dimensional weight explained and how to ship for less

Since carriers moved to dimensional pricing, box size matters as much as weight. This guide shows how it works and how to avoid paying to ship air.

Open the tool: Shipping Cost Calculator

1. Measure correctly

Measure the outside of the box at its widest points, including bulges. Round each side up to the next whole inch or centimetre. The longest side is the length.

2. Compare actual and DIM weight

Divide the volume by the divisor and compare with the scale weight. The larger number, rounded up, is billed.

3. Choose better packaging

  • Keep a few box sizes that fit your best-selling products closely.
  • Use mailers and padded envelopes for small, soft items.
  • Combine items into one box when it lowers the total billable weight.