ShipMargin
PackagingVerified formula

Void Space Calculator

Estimate how much of a box is not occupied by the product.

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)

Box inside 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

Measure empty volume and void percentage inside a shipping box. 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 500 in³ product in a 1,000 in³ box has 50% void space.

Assumptions

  • • Product bounding-box volume represents occupied space.

Limitations

  • • Irregular shapes and void-fill compression are not modeled.

Frequently asked questions

Is the Void Space 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.