ShipMargin
PackagingVerified formula

Smart Box Finder

Compare usable box configurations and minimize empty volume.

Free · no sign-up
Package inputs
Use outside package dimensions. Your result stays on this device unless you choose to save it.

Product dimensions (in)

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.

How to read the result

A decision, not just a number

Find the smallest demo box that fits a product with padding and rotation. Read the result alongside its interpretation, formula version, assumptions, and source. If a carrier rule is not verified, the production result remains disabled.

Worked example

Example calculation

A 7 × 5 × 3 in product with 0.25 in padding fits the 9 × 6 × 4 in demo mailer.

Assumptions

  • • Demo box dimensions are inside dimensions.
  • • Padding applies to every face.

Limitations

  • • Demo boxes are illustrative and do not represent supplier inventory.
  • • No dollar saving is claimed.

Frequently asked questions

Is the Smart Box Finder free?

Yes. Core ShipMargin calculators are free and show results without requiring an account.

Does this calculate a shipping price?

No. Without a verified live rate source, ShipMargin reports deterministic weights, dimensions, fit, or margin metrics—not invented dollar savings.

Can I save the result?

Anonymous results can be copied or shared. Saving calculation history is an optional account feature once Supabase is configured.