Net weight is the weight of the product alone. Gross weight is the product plus everything it ships in, such as cartons, crates and pallets. That is the core difference between net weight and gross weight, and it matters whenever you import industrial goods into the US or Canada and compare a supplier’s quotation with a freight bill or a customs form.
In Short
1
Gross weight = net weight + tare weight (the packaging).
2
Carriers bill on gross or chargeable weight, not on the net weight you pay for.
3
The packing list, invoice and bill of lading should show matching weights.
What Are Net Weight, Gross Weight and Tare Weight?
These three weight measurements describe different parts of a shipment and help buyers understand exactly what they are paying for and what appears on shipping documents. Knowing the difference is especially important when checking supplier documentation and arranging freight.
What Is Net Weight?
Net weight (N.W. or net wt) is the amount of product itself, with no packaging: the weight before any carton, pallet or crate is added.
What Is Gross Weight?
Gross weight (G.W. or gross wt) is the net weight plus all packaging: cartons, pallets, crates, skids and fillers. It is the weight that physically ships.
What Is Tare Weight?
Tare weight is the weight of the packaging alone, the gap between the other two. Gross is the full packed weight; tare is only the packaging part of it.
Net, Gross and Tare Weight: Industrial Pump Example
An industrial pump shows how the three fit together. On the supplier’s spec sheet it weighs 180 kg (397 lb). By the time it is bolted to a skid, wrapped in foam and sealed in a wooden crate, the shipment weighs 225 kg (496 lb):
| Term | What It Includes | Abbreviations | Industrial Pump Example |
|---|---|---|---|
| Net weight | The pump only | N.W., net wt | 180 kg (397 lb) |
| Gross weight | Pump, crate, skid and foam | G.W., gross wt | 225 kg (496 lb) |
| Tare weight | Packaging only | Tare | 45 kg (99 lb) |
Spec sheets often list net weight, while shipping documents rely on gross weight. Ask your supplier which one a quoted weight refers to.
Gross Weight vs Net Weight: Key Differences
Net weight decides what you pay the supplier for. Gross weight decides what it takes to move the goods.
| Feature | Net Weight | Gross Weight |
|---|---|---|
| Includes | The product only | Product, cartons, pallets, crates and fillers |
| Also written as | N.W., net wt | G.W., gross wt |
| Usually used for | Product pricing, specifications, weight-based duty calculations | Freight quotes, load planning, handling |
| Shown on | Spec sheet, invoice, packing list | Packing list, invoice, bill of lading, VGM |
| Which one is larger | Equal to or smaller | Equal to or larger |
💡 Buyer Tip
When you compare quotations, ask each supplier for both figures. A supplier who quotes only net weight may be leaving the packaging weight out of your freight estimate.
How to Calculate Gross and Net Weight
You only need a few formulas to calculate gross and net weight.
| Weight | Formula |
|---|---|
| Net weight | Quantity × weight per unit |
| Gross weight | Net weight + packaging weight |
| Gross weight (packed cartons) | Cartons × gross weight per carton (add pallet weight if used) |
| Tare weight | Gross weight – net weight |
| Net weight (from a scale reading) | Gross weight – tare weight |
If you don’t know the unit weight, weigh the packed shipment and subtract the packaging. If you do know it, multiply first and then add the packaging.
Example A: Palletized Metal Parts
Take machined steel parts packed in cartons and stacked on pallets:
| Step | Calculation | Result |
|---|---|---|
| Net weight | 1,200 parts × 3.5 kg | 4,200 kg (9,259 lb) |
| Carton packaging | 240 cartons × 0.8 kg | 192 kg (423 lb) |
| Pallets | 6 pallets × 25 kg | 150 kg (331 lb) |
| Total packaging (tare) | 192 + 150 | 342 kg (754 lb) |
| Gross weight | 4,200 + 342 | 4,542 kg (10,013 lb) |
Each carton holds 5 parts (17.5 kg net) and weighs 18.3 kg gross, so the packed cartons weigh 240 × 18.3 = 4,392 kg. The pallets bring the total to 4,542 kg. This carton-and-pallet pattern is typical of industrial materials sourcing from China.
Example B: Crated Machinery Part
Heavy parts carry far more packaging than cartons do. Take a tractor transmission unit:
| Step | Calculation | Result |
|---|---|---|
| Net weight (unit only) | Per spec sheet | 850 kg (1,874 lb) |
| Wooden skid | Measured | 40 kg (88 lb) |
| Wooden crate | Measured | 120 kg (265 lb) |
| Foam and rust protection | Measured | 10 kg (22 lb) |
| Total packaging (tare) | 40 + 120 + 10 | 170 kg (375 lb) |
| Gross weight | 850 + 170 | 1,020 kg (2,249 lb) |
Check it in reverse: 1,020 kg gross – 170 kg tare = 850 kg net. Here the packaging adds 20% to the weight of the machine. Crated, heavy equipment like this is common in agricultural machinery sourcing.
💡 Buyer Tip
Ask your supplier for a weight breakdown per carton and per pallet or crate, not just one total. Any figure that doesn’t add up is worth questioning before the goods ship.
Which Weight Goes on Which Shipping Document
Each shipping document uses weight for a different purpose.
| Document | Weight Shown | Why It Matters |
|---|---|---|
| Packing list | Net and gross weight, per package and in total | Lets you and the carrier check what was actually packed |
| Commercial invoice | Quantities, and often net and gross weight | Supports the declared value and quantity of the goods |
| Bill of lading | Gross weight of the cargo (net usually optional) | The carrier uses it for handling and load planning |
| Customs entry | Declared weight, as your customs broker files it | Duty on some goods is based on net weight |
| VGM declaration (containers) | Gross mass of the packed container, including tare | Required under SOLAS before the container is loaded |
US and Canadian Customs Requirements
🇺🇸 United States
For US imports, U.S. Customs and Border Protection requires a commercial invoice with the entry. It also notes that when duty depends on net weight, an allowance for packaging (tare) is deducted from the gross weight.
🇨🇦 Canada
For Canada, the Canada Border Services Agency (CBSA) sets its invoice requirements in Memorandum D1-4-1, which ask for both net and gross weight on the commercial invoice or the Canada Customs Invoice (Form CI1). Make sure your supplier’s invoice shows both, and confirm the exact fields with your customs broker.
Check the Documents Against Each Other
The most useful check is whether the figures on your supplier’s packing list add up. Take a shipment of electronic components: each carton has a net weight of 12 kg (26.5 lb) and a gross weight of 14 kg (30.9 lb), so the packaging adds 2 kg (4.4 lb) per carton. For 20 cartons, the packing list should show a total net weight of 240 kg (529.1 lb) and a total gross weight of 280 kg (617.3 lb). The invoice totals should match those figures, and the gross total should match the bill of lading.
If any of them don’t match, ask the supplier to correct the documents before the goods ship, not after they reach the port. Packaging-heavy goods like these are a frequent source of mismatches in electronic equipment sourcing. Mismatched paperwork is also one of the common sourcing challenges buyers face, and it is easiest to catch before dispatch.
💡 Buyer Tip
A procurement partner that reviews supplier documents before dispatch can catch these mismatches while they are still easy to fix.
Tare Weight and Container Gross Weight (VGM)
Tare weight also applies to the container itself. For container shipments, the figure that counts is the verified gross mass (VGM): the weight of the packed container, including the empty container. The three weights stack. Net weight is the goods only, cargo gross weight adds the packaging, and the VGM adds the container’s tare weight on top.
Example: A Container of New Energy Equipment
Take an order of 40 inverter units. Each unit weighs 180 kg (397 lb), so the net weight is 7,200 kg (15,873 lb). Crates, pallets and securing material add 900 kg (1,984 lb), which makes the cargo gross weight 8,100 kg (17,857 lb). Assume the empty 20-foot container has a tare weight of 2,300 kg (5,071 lb). The VGM is then 8,100 + 2,300 = 10,400 kg (22,928 lb). Shipments like this are typical of new energy equipment sourcing from China, where heavy units make container limits matter.
Net weight
7,200 kg
Packaging
900 kg
Container tare
2,300 kg
VGM
10,400 kg
The rule comes from the International Maritime Organization. Under IMO’s SOLAS requirement, the shipper named on the bill of lading must verify the gross mass of a packed container, either by weighing the whole container or by weighing all packages and cargo items and adding the container’s tare mass. A packed container without a verified gross mass should not be loaded onto the ship, and an estimate is not accepted as a verification.
Every container also has a maximum gross weight, marked on its safety approval plate (CSC plate). Its payload is that limit minus the container’s tare weight, so the VGM must stay within it.
💡 Buyer Tip
Confirm early who is named as the shipper and who will provide the VGM. If the figure is missing or looks lower than your cargo gross weight, ask your supplier before loading, because the container can be held at the port.
How Freight Is Billed: Gross vs Chargeable Weight
Carriers generally bill on the gross weight of the packed shipment, not on the net weight you pay the supplier for. Many also compare it with the shipment’s volume and charge on the greater of the two, which is called the chargeable weight. This is most common in air freight and parcel shipping, so a bulky but light shipment can be billed on its size rather than its weight. Ocean LCL shipments are commonly billed per cubic meter or per tonne, whichever is greater. Ask your freight forwarder how a specific shipment will be charged.
Here is how it works for air freight, which commonly divides volume in cm³ by 6,000. Take a crate of insulation boards measuring 120 x 100 x 110 cm:
| Step | Calculation | Result |
|---|---|---|
| Actual gross weight | Weighed | 150 kg (331 lb) |
| Volume | 120 × 100 × 110 cm | 1,320,000 cm³ |
| Volumetric weight | 1,320,000 ÷ 6,000 | 220 kg (485 lb) |
| Chargeable weight | Higher of the two | 220 kg (485 lb) |
The crate is billed on 47% more than it actually weighs. Bulky, light building materials like these are common in construction industry sourcing from China. Express couriers often use a divisor of 5,000, which makes the gap even larger.
Common Weight Mistakes and How to Avoid Them
| Mistake | What It Can Cause | How to Avoid It |
|---|---|---|
| Budgeting freight from net weight | Underestimated freight cost | Ask for gross weight before you request a freight quote |
| Supplier estimates weights instead of weighing | Documents that don’t match the real shipment | Ask for weighed figures per carton and per pallet |
| Packaging changes after documents are issued | Packing list no longer matches the cargo | Request an updated packing list after final packing |
| Packing list, invoice and bill of lading disagree | Questions from customs and possible holds | Cross-check the totals before dispatch |
| Leaving container tare out of the total | An understated VGM, and the container may not be loaded | Include the empty container’s weight in the total |
| Mixing kg and lb | Figures off by more than double | Confirm the unit on every document |
Net Weight vs Gross Weight FAQs
Should gross weight or net weight be higher?
Gross weight should always be higher, or equal at the very least, because it is net weight plus packaging. The two match only when goods ship with no packaging. If a packing list shows a net weight of 4,300 kg and a gross weight of 4,200 kg, one figure is wrong, so ask for a corrected document before shipment.
Should I use net weight or gross weight?
It depends on the purpose. Use net weight for pricing, specifications and product labels. Use gross weight for freight quotes, load planning, the packing list and the bill of lading. Customs documents often need both.
Does net weight include the container or packaging?
No. Net weight excludes the packaging around the goods, such as the drum, bag, carton, pallet or crate. All of that is tare weight, and it is added to net weight to give gross weight. On a product label, net weight shows the contents only.
What is NW and GW on a packing list?
N.W. is net weight and G.W. is gross weight. A packing list normally shows both for each package, followed by a total line. The package figures should add up to the totals, and the units (kg or lb) should be the same throughout.
Why is 1 cbm 167 kg?
Air freight counts 6,000 cubic centimeters as 1 kg, so 1 cubic meter (1,000,000 cm³) becomes about 167 kg. The carrier bills the higher of this volumetric weight and the actual gross weight.
What is gross for net weight?
It is a pricing term where the packaging is charged at the product price, so you pay for gross weight instead of net weight. Check which basis your quotation uses, because it changes the real cost per kilogram of product.
Does gross weight mean something different for a container, trailer or vehicle?
Yes. For a container, the verified gross mass (VGM) includes the empty container. For a truck or trailer, gross weight usually means the vehicle plus its load, and the limit comes from the vehicle’s weight rating and road limits. The cargo gross weight on your packing list is a separate figure: the goods and their packaging only.
Get Your Shipment Weights Checked Before Dispatch
Weight problems are easiest to fix while the goods are still at the supplier. Sourcing Captain supports industrial buyers across materials, equipment and components, and our team runs pre-shipment inspections before dispatch.
If you want support on a supplier or an upcoming order, talk to a China sourcing agent who works with US and Canadian importers․