Gross Weight vs Net Weight: What Importers Need to Know (With Calculation Examples)

Net weight is the weight of the product itself — without any packaging, containers, or pallets.

Gross weight is the total weight of everything: product + inner packaging + outer carton + pallet + any packing materials.

Tare weight is the weight of the packaging alone (gross weight minus net weight).

The formula is straightforward:

Gross Weight = Net Weight + Tare Weight (packaging)

For example: You order 1,000 stainless steel tumblers from a Chinese factory. Each tumbler weighs 350g (net weight). Packed in individual boxes, then in cartons of 24 units each, with foam inserts:

1. Freight Costs Are Based on Gross Weight (or Volume — Whichever Is Higher)

Shipping companies charge based on the greater of actual gross weight or volumetric weight (also called dimensional weight). This is the "chargeable weight."

Actual gross weight: What the shipment weighs on a scale, including all packaging.

Volumetric weight: Calculated from the dimensions of the cartons. For ocean freight, the formula is typically L × W × H (cm) ÷ 6,000 per carton. For air freight, it's L × W × H (cm) ÷ 5,000.

Bulky, lightweight products (like pillows or plastic toys) often have volumetric weight higher than actual weight — so you pay based on size, not mass. Dense products (metal parts, hardware) are the opposite.

2. Customs Duties Often Use Net Weight

For many product categories, customs duties are calculated based on net weight — the weight of the goods without packaging. This is because duties are meant to tax the product, not the cardboard box around it. However, some tariff codes specify gross weight, so always check the specific HS code requirements for your product.

3. Product Pricing and MOQ Calculations

When a factory quotes you a price per kilogram (common for raw materials, metals, chemicals), confirm whether it's per kg of net weight or gross weight. A 5% difference in weight definition can mean a 5% difference in your total cost.

Mistake 1: Confusing G.W. and N.W. on the quotation. Chinese factory quotations typically list both "G.W." (gross weight) and "N.W." (net weight) per carton. Some importers use the wrong number for freight estimates and get surprised by the actual shipping cost. Always use G.W. for freight calculations.

Mistake 2: Not accounting for pallet weight. If your shipment is palletized, each wooden pallet adds 15-25kg. On a 20-foot container with 10 pallets, that's 150-250kg of pallet weight on top of your product gross weight.

Mistake 3: Trusting product listings without verification. On B2B platforms, the listed product weight is often approximate or outdated. When planning logistics for a large order, always request the exact carton dimensions and gross weight from the factory, and verify with a sample shipment.

Mistake 4: Ignoring CBM (cubic meters) for ocean freight. For ocean shipping, the key metric is often CBM rather than weight. A 20-foot container holds approximately 28-30 CBM or up to 21,500kg (whichever limit is reached first). Calculate both to determine how many units fit in a container.

When communicating with Chinese factories, always specify which weight you're referring to. Use the abbreviations G.W. and N.W. — they're universally understood in Chinese export businesses.