Calculator · sample rates, editable · 2026-11-08
Volumetric weight: length x width x height divided by 6000
You packed a single hoodie into a 40 x 30 x 12 cm box. The scale says 0.9 kg, the freight quote says 2.4 kg, and nothing on the label explains the difference. That difference is volumetric weight, sometimes called dimensional weight, and it exists because a cargo hold is a fixed volume. Carriers bill whichever is larger, the space your parcel takes or the mass it carries. This calculator does the one division that creates the gap, shows how much of your bill is pure empty space, and lets you test a smaller box before you commit to a repack request.
Fill the fields and the result appears here.
How the number is built
Sample, editable. Volumetric weight in kilograms = length (cm) x width (cm) x height (cm) / divisor, with the divisor defaulting to 6000, 5000, or 8000 as selected. Chargeable weight = the larger of volumetric weight and actual weight. A worked example with our defaults: 40 x 30 x 12 = 14,400 cubic centimetres, divided by 6000 = 2.4 kg volumetric, which beats a 0.9 kg scale reading, so 2.4 kg is what you would be billed. These divisors are the common industry convention, not a rate published by any agent or carrier, and they are editable in the tool. Every figure is an estimate for planning, not a checkout price.
What each field is asking for
- Length, width, and height of the packed box in centimetres. Measure the outside faces of the closed box.
- Unit toggle: centimetres or inches. Inch input is converted to centimetres first, because every divisor we ship with assumes centimetres.
- Actual weight in kilograms, optional but recommended. Without it the tool cannot tell you which weight will be chargeable.
- Divisor selector: 6000 for economy lines, 5000 for many express lines, 8000 for one rare bulky-goods line. All three are sample values you can overwrite.
- Rounding rule selector: carriers commonly round each dimension up to the next whole centimetre, or round the final weight up to the next 0.5 kg. Choose the one your line documents.
What you get back
Volumetric weight in kilograms, the cubic volume of the box in cubic centimetres, and a direct comparison line that names the chargeable weight. When an actual weight is supplied the tool also prints the empty-space share: how many kilograms you are paying for that carry no goods. A second line shows what the same goods would cost at the next smaller standard box size, so you can see whether a repack is worth requesting.
The method
Why the arithmetic works this way
If you understand the mechanics you can sanity-check any quote, including ours.
Where the 6000 comes from, and why it is not universal
The number 6000 is a density convention. It says that one cubic metre of freight is assumed to weigh about 167 kg, or that one kilogram occupies 6000 cubic centimetres. Airlines, integrators, and consolidators each use their own figure because their aircraft, containers, and handling differ. A 5000 divisor assumes denser cargo, so it produces a bigger weight from the same box and is normally paired with faster, space-scarce services. An 8000 divisor assumes very light bulky cargo and appears on a few sea or rail products. If you get a quote that seems to disagree with this calculator, check the divisor on the line page before you accuse anyone of anything. It is almost always the divisor or the rounding rule.
When volumetric weight stops mattering
Dense goods ignore this whole page. A parcel of heavy sneakers, books, or tools usually weighs more than its box suggests, so the scale wins and volumetric weight is irrelevant. The rule of thumb at a divisor of 6000 is that anything denser than about 167 kg per cubic metre is scale-billed. A pair of boots in a 33 x 22 x 13 cm box occupies about 9440 cubic centimetres, which is 1.57 kg of volumetric weight. If the pair actually weighs 1.8 kg, you are paying on the scale and no repacking will help. Run both numbers before you ask the warehouse to do work that cannot reduce your bill.
The parts of this calculation we do not control
The single largest source of error is the measurement itself. A box that looks like 40 x 30 x 12 cm to you may scan as 42 x 31 x 12.5 cm at the warehouse, because tape, bulges, and a soft-sided parcel all push outward. That is a 15 percent volume increase, which becomes a 15 percent freight increase. We also cannot see how the warehouse packs. If you paid for corner protection or vacuum bags, the outer box grows. And we do not know whether the line rounds each dimension up before multiplying, which on a 40.2 cm side adds more than you expect. Every one of these is a reason to treat the output as a range, not a promise.
Worked example
Numbers you can check against the form
Run one of these rows through the fields above and the output should match.
| Carton (cm) | Actual | ÷6000 | ÷5000 | Which wins |
|---|---|---|---|---|
| 30 × 20 × 10 | 0.40 kg | 1.00 kg | 1.20 kg | Volumetric, both divisors |
| 40 × 30 × 20 | 1.20 kg | 4.00 kg | 4.80 kg | Volumetric, both divisors |
| 50 × 40 × 30 | 3.00 kg | 10.00 kg | 12.00 kg | Volumetric, both divisors |
| 20 × 15 × 10 | 0.60 kg | 0.50 kg | 0.60 kg | Actual weight |
Common questions
Questions about this calculator
Is volumetric weight the same as the weight on my receipt?
No. The weight on a warehouse receipt is usually the scale reading of the item as received. Volumetric weight is computed later from the outer box that the carrier measures. If the two disagree, the one that decides your freight is the chargeable weight, which is the larger of them for the line you chose.
Can I ask the warehouse to use a smaller box?
Usually yes, and it is often free or costs a small service fee. Say explicitly that you accept tighter packing and reduced protection. Some services also offer vacuum compression for soft goods, which cuts volume on hoodies and coats more than on rigid items.
My box is a soft poly bag. Does volumetric weight apply?
Yes, and bags are often the worst offenders per kilogram of goods, because they conform to whatever shape the contents take. A stuffed bag can become nearly a cube. Measure the bag as it will be taped, not as it looks when you squeeze it flat.
Why does the calculator show 2.4 kg when the line page says the parcel was 3 kg?
Either the measured dimensions were larger than your input, the line uses a divisor you did not select, or the measured weight was rounded up before billing. Check the recorded dimensions on the shipment detail first. If they differ from what you entered, the carrier measurement wins.
Related searches
- volumetric weight
- dimensional weight
- 6000 divisor
- box size
- chargeable weight
- oopbuy shipping calculator
- oopbuy spreadsheet
- oopbuy spreadsheets
Now put a real row through it
The calculator tells you what a parcel costs. The catalogue tells you what goes in it.
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