Net weight is the weight of the product alone. Gross weight is the product plus everything it ships in: the box, padding, tape and, for freight, the pallet and wrap. Carriers bill on gross weight, or on dimensional weight when the box is large for its weight, while net weight matters for product labels and customs paperwork.
The difference between the two is the tare weight, the weight of the packaging. Get all three numbers right and your shipping quotes, labels and customs forms will match what the carrier measures.
Table of Contents
- What is the difference between gross weight and net weight?
- How does tare weight connect net and gross weight?
- Which weight do carriers use to bill a package?
- How do you calculate gross and net weight?
- How do gross and net weight work for pallets and freight?
- Why do customs forms ask for both weights?
- What mistakes cause weight adjustments?
- Frequently Asked Questions
What Is the Difference Between Gross Weight and Net Weight?
Think of a box of coffee mugs. The mugs themselves weigh 25 pounds, which is the net weight. The box adds 1.5 pounds and the bubble wrap adds 0.3 pounds, so the gross weight is 26.8 pounds. The carrier’s scale sees 26.8 pounds, and that’s the starting point for the shipping charge.
| Net weight | Gross weight | |
|---|---|---|
| What it includes | Product only | Product, packaging, padding, pallet and wrap |
| Where it appears | Product labels, invoices, customs forms | Shipping labels, bills of lading, customs forms |
| Who uses it | Buyers, regulators, customs (for some duties) | Carriers, freight carriers, customs (to verify the shipment) |
| Affects shipping charge? | No, not directly | Yes, along with dimensional weight |
Net weight is what a customer is buying. For packaged consumer goods it’s the “Net Wt.” figure printed on the label, which federal labeling rules require. Gross weight is what has to be moved, so it’s the number every carrier cares about.
How Does Tare Weight Connect Net and Gross Weight?
Tare weight is the weight of the empty packaging. The three numbers always fit one formula:
Net weight + tare weight = gross weight, so gross weight − tare weight = net weight.
Tare is easy to underestimate because it’s spread across several materials. A corrugated box, a bubble mailer, void fill, tape and a packing slip each weigh only ounces, but they add up. For lightweight items, the packaging can be the difference between one billed pound and the next. Our guide to how much a bubble mailer weighs lists typical mailer weights by size.
Electronics are a good example of the gap. An iPad might weigh around a pound on its own, but in a retail box with a charger and padding, the gross weight is noticeably higher. Our guide to how much an iPad weighs compares the device and boxed weights.
Which Weight Do Carriers Use to Bill a Package?
UPS and USPS charge by billable weight: the greater of the package’s actual (gross) weight and its dimensional weight. Net weight never enters the calculation. Both carriers also round any fraction of a pound up to the next whole pound, so a 4.2-pound package is billed as 5 pounds.
Dimensional weight converts the box’s size into a weight. Multiply length × width × height in inches, then divide by the carrier’s divisor:
- UPS: a divisor of 139 for packages billed at daily rates, with each dimension measured to the next whole inch.
- USPS: dimensional weight applies only to parcels larger than 1 cubic foot (1,728 cubic inches). For retail Priority Mail, each dimension rounds up to the nearest whole inch and the cubic size is divided by 139.
Here’s how that works for a 12 × 10 × 8 inch box with a gross weight of 4.2 pounds. The box measures 960 cubic inches. At UPS, 960 ÷ 139 = 6.9, so the dimensional weight rounds up to 7 pounds and the billable weight is 7 pounds. At USPS, 960 cubic inches is under 1 cubic foot, so dimensional weight doesn’t apply and the billable weight is the gross weight rounded up: 5 pounds.
Accurate dimensions matter as much as an accurate scale. Our guide to how to read dimensions covers the length × width × height order, and the step-by-step guide to calculating cubic inches shows the math. For UPS specifically, see our breakdown of dimensional weight at UPS.
Gross weight also decides which size and weight limits apply. USPS accepts packages up to 70 pounds and UPS up to 150 pounds. UPS adds an Additional Handling charge to domestic packages with an actual weight over 50 pounds. For oversized boxes, a girth calculator checks length plus girth against carrier maximums.
How Do You Calculate Gross and Net Weight?
For a single package:
- Weigh the empty packaging (box, padding and any inserts) and record the tare weight.
- Pack the product and weigh the sealed box. That’s the gross weight you enter on the label.
- Subtract tare from gross to get the net weight for invoices or customs forms.
- Measure the sealed box at its longest points, rounding up to the next whole inch, so the dimensions match what the carrier will measure.
If you don’t have a shipping scale, our guide to weighing packages at home covers bathroom-scale and luggage-scale methods. Check your scale now and then with something of known weight. A gallon of water weighs about 8.34 pounds.
Once you have the gross weight and dimensions, you can compare live UPS and USPS prices for the package in the ParcelPath rate calculator. ParcelPath is free to use, with up to 85% off UPS and up to 89% off USPS retail rates, and our guide on how to ship for less covers packaging choices that keep billable weight down.
How Do Gross and Net Weight Work for Pallets and Freight?
On a pallet, the tare includes the pallet itself, plus stretch wrap, strapping and corner boards. A standard wooden pallet weighs roughly 30 to 50 pounds before anything goes on it, and our guide to how much a wood pallet weighs breaks that down by type.
Using the mug example: if you stack 20 of those 26.8-pound cartons on a 40-pound pallet and add 2 pounds of wrap, the shipment’s gross weight is 578 pounds (536 + 40 + 2). The net weight is still 500 pounds of mugs. The gross figure goes on the bill of lading, and LTL carriers use it, together with the pallet’s dimensions, to work out density and freight class.
Freight carriers reweigh shipments, and a gross weight that’s lower than declared leads to a billing correction. To price a pallet with its full gross weight, use the PalletPath LTL freight quote.
Why Do Customs Forms Ask for Both Weights?
International shipments usually list both figures. The gross weight lets the carrier and customs check the physical shipment against its paperwork. The net weight describes the goods themselves, which matters because some tariff lines are assessed by the quantity of goods (for example, per kilogram), not by the packaging around them.
Commercial invoices and packing lists typically show net and gross weight per line or per carton. If the two don’t add up, or the gross weight on the paperwork doesn’t match the scale, clearance can slow down while the shipment is checked. Keep the numbers consistent across the label, the invoice and the packing list.
What Mistakes Cause Weight Adjustments?
- Entering net weight on the label. The carrier weighs the sealed package, and a figure that leaves out the packaging leads to an adjustment.
- Forgetting the pallet. On freight, the pallet and wrap are part of the gross weight.
- Measuring the product, not the box. Dimensional weight uses the outside of the sealed package, including any bulges.
- Rounding dimensions down. Carriers measure to the next whole inch, so a 12.2-inch side counts as 13 inches.
- Guessing the packaging weight. Weigh a packed sample of each box size once and keep a tare chart for repeat shipments.
These rules apply to every domestic shipment with UPS or USPS. Get the gross weight and the box size right, and the label price will usually match the final charge.
Frequently Asked Questions
Do carriers charge by gross weight or net weight?
Carriers charge by gross weight, not net weight, or by dimensional weight if that’s higher. UPS and USPS bill the greater of the sealed package’s actual weight and its dimensional weight, rounding any fraction of a pound up. The weight of the product alone never sets the shipping charge.
How do you find net weight from gross weight?
Subtract the tare weight from the gross weight. Weigh the empty box, padding and inserts to get the tare, weigh the sealed package to get the gross weight, then subtract. For example, a 26.8-pound gross package with 1.8 pounds of packaging has a net weight of 25 pounds.
Is gross weight always heavier than net weight?
Yes, gross weight is always at least equal to net weight, because it’s the net weight plus packaging. The gap is small for a product in a light mailer and large for freight, where a wooden pallet alone typically adds about 30 to 50 pounds to the gross weight of the shipment.
What is the difference between gross weight and dimensional weight?
Gross weight is what the sealed package weighs on a scale. Dimensional weight is a calculated figure based on its size: length × width × height divided by the carrier’s divisor, such as 139 at UPS. The carrier bills whichever of the two is greater.
Sources
- USPS Domestic Mail Manual 123: Postage and price computation (dimensional weight)
- UPS: Package dimensions and weight
- USPS: Mail and shipping services (70 lb maximum)
- NMFTA: National Motor Freight Classification
Part of our How to Weigh Packages at Home guide. Related: Weighing Packages for Shipping, How Much Does a Tire Weigh, How Much Does a Gallon of Water Weigh.
