GetShipMargin
OversizeVerified formula

Package Girth Calculator

Identify the longest side and calculate distance around the two shorter sides.

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

Calculate girth and combined length plus girth from three dimensions. 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

Girth = 2 × (width + height), where length is the package’s longest side.

Example: For 30 × 20 × 10 in, girth is 60 in and combined length plus girth is 90 in.

Assumptions

  • • The longest measured side is treated as length.

Limitations

  • • Carrier-specific oversize treatment must be checked separately.

Frequently asked questions

Is the Package Girth Calculator free?

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

How is the result calculated?

Girth = 2 × (width + height), where length is the package’s longest side.

What should I verify before using it?

Carrier-specific oversize treatment must be checked separately.

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.