ShipMargin
WeightVerified formula

Dimensional Weight Calculator

Find the weight a carrier may use when package size exceeds physical weight.

Free · no sign-upRule: generic-dim-v1
Package inputs
Use outside package dimensions. Your result stays on this device unless you choose to save it.
Generic DIM scenario
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 dimensional and billable weight from package size and actual weight. 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 16 × 12 × 8 in box at 4 lb produces a transparent generic DIM scenario using divisor 139.

Assumptions

  • • Rectangular dimensions use the package's outside measurements.
  • • Generic mode is a scenario, not a carrier quote.

Limitations

  • • Contract-specific divisors and rates are not included.
  • • No dollar shipping rate is estimated.

Frequently asked questions

Is the Dimensional Weight 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.