ShipMargin
OversizeVerified formula

Oversize Package Calculator

Screen dimensions for common oversize and nonstandard warning conditions.

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

Check package length, girth, volume, and USPS-oriented threshold warnings. 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 package whose longest side plus girth exceeds 108 in receives an oversize warning.

Assumptions

  • • The longest side is treated as length.

Limitations

  • • Warnings are not a postage quote or mailability determination.

Frequently asked questions

Is the Oversize Package Calculator 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.