Two weights answer different questions
Actual weight comes from a scale with the shipment packed. Volumetric weight converts outside dimensions into a weight-equivalent using the divisor for the selected service. A light, bulky box can therefore be rated on a larger figure than its scale weight.
The generic Cargoivo tool shows the larger of actual and volumetric weight before service-specific rounding. It is useful for exploring packaging choices, but it does not calculate a shipping price or apply every carrier minimum.
One box, two divisors
For a 50 × 40 × 30 cm box, volume is 60,000 cm³. At divisor 5000 the volumetric result is 12 kg; at divisor 6000 it is 10 kg. With actual weight 7 kg, volume governs both scenarios. With actual weight 14 kg, actual weight governs both.
| Actual | Divisor | Volumetric | Larger weight |
|---|---|---|---|
| 7 kg | 5000 | 12 kg | 12 kg |
| 7 kg | 6000 | 10 kg | 10 kg |
| 14 kg | 5000 | 12 kg | 14 kg |
| 14 kg | 6000 | 10 kg | 14 kg |
Find the break-even height
Keep the 50 × 40 cm footprint and a 7 kg actual weight. At divisor 5000, the break-even height is 7 × 5000 ÷ (50 × 40) = 17.5 cm. Above that height, volumetric weight exceeds 7 kg before rounding. At divisor 6000 the break-even height is 21 cm.
This is a mathematical threshold for the chosen divisor. It does not mean a carrier will bill precisely at that decimal boundary. Rounded package dimensions, chargeable-weight increments and minimum charges can move the practical outcome. Packaging also has to protect the contents; removing essential cushioning to hit a threshold can be a false economy.
Choose the tool that matches the question
Use the generic volumetric calculator to compare divisors without hidden rounding. Use the U.S. dimensional comparison for its explicitly listed parcel presets: it rounds dimensions and pounds as shown and links the current sources. For multiple identical pieces, use the chargeable-weight worksheet.
Do not move a divisor between centimeters/kilograms and inches/pounds. The unit system is part of the formula. A quoted divisor of 139 belongs to the inch/pound scenario shown in the carrier comparison, not the 60,000 cm³ calculation above.
Reproduce the calculation
Use the related Cargoivo calculator with your own shipment dimensions, weight, or quantity.
Open Chargeable Weight Calculator →Cargoivo provides educational planning information, not a freight quote, engineering approval, customs advice, or carrier commitment. Verify current service rules, equipment specifications, and commercial terms before shipping.