ShipMargin
Anonymous first · US rules · source verified

Shipping & DIM Weight Calculator

See what you are really being billed for—and whether a smaller box can protect your margin.

Free · no sign-upRule: generic-dim-v1
Package inputs
Use outside package dimensions. Your result stays on this device unless you choose to save it.
Generic DIM scenario
Live result Deterministic
Shipping intelligence
No AI estimates. Every output comes from the published formula.

Your result will appear here

Enter package data and calculate. No account is required.

No sign-up before results No invented shipping rates Versioned formulas

Make the box earn its space

Three decisions. One cleaner margin.

Browse all 15 tools

Know the billable weight

Compare physical and dimensional weight under a published rule.

Choose a tighter box

Test rotation, padding, void space, and demo box alternatives.

Protect contribution margin

Translate shipping and packaging costs into order economics.

Rules you can inspect, not magic numbers.

A rule must have a source, effective date, version, and verification status before it can power a production calculation.

USPS July 12, 2026 rule verified
UPS and FedEx stay locked until verified
Formula versions appear with results
No live rates means no fake dollar savings