ShipMargin
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 read the result

A decision, not just a number

Calculate girth and combined length plus girth from three dimensions. 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

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. 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.