GetShipMargin
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 use this tool

A decision, not just an output

Check package length, girth, volume, and USPS-oriented threshold warnings. Read the output alongside its interpretation, assumptions, limitations, and source. Marketplace rates and external requirements should always be confirmed at the linked official source.

Formula & example

Transparent method

Length plus girth = longest side + 2 × the sum of the two shorter sides.

Example: 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. The primary result is available without creating an account or entering an email address.

How is the result calculated?

Length plus girth = longest side + 2 × the sum of the two shorter sides.

What should I verify before using it?

Warnings are not a postage quote or mailability determination.

Are my inputs private?

Core inputs are processed in your browser. GetShipMargin Tools records anonymous interaction events, not the business values entered into this form.