Chargeable weight calculator

How chargeable weight is determined

For services that use dimensional-weight rating, the basic decision is chargeable weight = greater of actual weight or dimensional weight. Actual weight reflects mass on the scale; dimensional weight reflects how much capacity a package consumes. The carrier then applies its own rounding, minimums, service rules and rate card to the resulting billable quantity.

The calculator above is useful for identical packages. For mixed shipments, the calculation should not simply compare one grand-total actual weight with one grand-total DIM weight. Where a carrier rates packages individually, the higher figure needs to be determined for each package or cargo line and then summed.

Why the divisor changes the answer

At 5,000 cm³/kg, every 5,000 cubic centimetres represents one kilogram of dimensional weight. At 6,000, the same volume represents less dimensional weight. There is no safe reason to assume that a generic “air freight divisor” or parcel divisor applies to every carrier, lane or contract. Use the exact published or quoted rule whenever the calculation is financially important.

What ShipMeasure does—and does not—reproduce

ShipMeasure calculates the geometry and the actual-vs-DIM comparison. It does not attempt to imitate every carrier's package measurement rounding, half-kilogram or whole-kilogram rounding, minimum charge, oversize surcharge, service restriction or negotiated contract. Those rules can materially change the final invoice even when the underlying dimensional-weight formula is the same.

Use chargeable weight as a decision signal

A persistent gap between scale weight and DIM weight tells you that packaging volume is potentially expensive. That can guide carton redesign, product bundling or service comparison. If scale weight already exceeds DIM weight, shrinking the carton may still improve cube utilisation, but it will not reduce the simple DIM-based billable weight until the freight rule itself changes.