How the Weight Is Established and Checked
When a move is priced by the pound, one number decides the invoice. The rules set exactly how that number is produced, who may stand at the scale, and the point at which a shipper can demand the whole thing be done again.
The rule in short
An interstate household goods shipment charged by weight must be weighed either as an origin weigh or a back weigh, with the vehicle fully equipped, nobody aboard, and the fuel tanks handled consistently. The shipper may observe every weighing and, after being told the billing weight and total charges but before unloading begins on an origin weigh, may demand a reweigh. The reweigh weight then governs the freight bill, and weight tickets must accompany the invoice.
On a move priced by weight, the charge comes from a scale, not from an opinion. The carrier weighs the loaded and unloaded vehicle, produces a signed ticket for each weighing, and bills on the difference.
The shipper has two rights that most people never use. The first is to stand at the scale and watch. The second is to demand that the whole thing be repeated once the billing weight has been disclosed, at which point the second figure replaces the first as the basis of the freight bill. Both rights belong to the shipper on an interstate household goods move, and both are worth more before the truck is unloaded than after.
The two ways a shipment gets weighed
The first method is the origin weigh. The empty vehicle is weighed before loading to give the tare, then the same vehicle is weighed again with the shipment aboard to give the gross. The difference is the shipment weight. The second method is the back weigh, which reverses the order: the loaded vehicle is weighed first, then weighed again after unloading.
Three conditions apply to both weighings. All pads, dollies, hand trucks, ramps and other equipment that will be used on the move must already be loaded or installed. The driver and every other person must be off the vehicle. The fuel tanks must be full at each weighing, or, on an origin weigh where the tare is taken first, no fuel may be added between the two. A tractor-trailer may be split and the trailer weighed separately, provided the scale platform is long enough to hold the whole trailer at once.
Small shipments and figures that were never weighed
A shipment of 3,000 pounds or less may be weighed on a certified platform or warehouse scale before loading or after unloading, rather than by weighing the vehicle. That is the practical route for a studio apartment or a partial load, and it is often more accurate than trying to isolate a small consignment on a truck scale.
Constructive weight is a different animal. It is a figure derived from the space a shipment occupies rather than from a scale, and it appears in carrier tariffs mainly where the load shares a trailer or where an actual weighing is impossible. A constructive figure is not a substitute for the tickets on a shipment that was in fact weighed, and a shipper billed on one should ask in writing which tariff provision produced it.
Volume is the other source of confusion. Some carriers quote by cubic feet and convert to a weight-based rate later. Where that happens on a non-binding estimate, the carrier must give the shipper a written explanation of the formula used for the conversion. A quote in cubic feet with no stated conversion is a quote that cannot be checked against anything, and it tends to become a much larger number once the load is on a truck several states away.
The right to demand a reweigh exists after the carrier informs the shipper of the billing weight and total charges, and before it actually begins to unload a shipment weighed at origin. Once the crew starts carrying cartons into the house the opportunity is gone, because the truck can no longer be weighed loaded. That is why the notice of weight and charges matters: it is the signal that the clock has started.
Watching the scale, and waiving the right to
The carrier must give the shipper, or whoever is responsible for paying the freight charges, the right to observe all weighings. It must say where and when each weighing will take place and allow a reasonable opportunity to be there. A shipper who simply does not turn up is presumed to have waived the right for that weighing. Waiving the right to observe a reweigh is different: it has to be done in writing, and it may be sent by fax, email, overnight courier or certified mail.
Waiving observation costs nothing else. It does not affect any other right under the rules, including the right to demand the reweigh itself, to receive the tickets, or to bring a claim later. Many shippers skip the scale trip simply because it happens at an inconvenient hour on a highway weighbridge.
There is a practical reason to go anyway on an origin weigh. The tare weighing is the one nobody can reconstruct afterwards. If the truck already held another customer's goods, or if equipment that should have been aboard was left on the dock, the error is baked into every later figure and no document will reveal it. Watching costs an hour. Proving the same point from a signed ticket weeks later is usually impossible.
Which route produces which figure
| Route | How the number is produced | What governs the bill |
|---|---|---|
| Origin weigh | Tare before loading, gross after loading | The difference, unless a reweigh is demanded |
| Back weigh | Gross on arrival, tare after unloading | The difference; no reweigh right applies |
| Light shipment on a platform scale | The shipment weighed directly, off the vehicle | That weighing, for loads of 3,000 pounds or less |
| Reweigh after demand | The whole weighing repeated | The reweigh figure, replacing the original |
| Binding estimate | Weight is recorded but does not price the move | The estimate itself, for the goods and services listed |
What to do when the number looks wrong
Ask for the tickets first. Each weighing produces its own signed ticket, and the six required items on it are enough to expose most problems: a scale in the wrong state, a date that does not match the move, a vehicle identification that is not the truck that came, or a gross weight recorded while somebody was still sitting in the cab. Copies must be furnished with any freight bill that depends on weight.
If the tickets look right and the number still looks high, the reweigh is the remedy, and it must be demanded before unloading starts. If the shipment has already been unloaded, the argument shifts to the documents: the inventory, the estimate and the terms written into the bill of lading that governs the move. Whether the weight matters at all depends on which pricing route was chosen, which is the subject of binding and non-binding estimates.
A dispute purely about the figure, rather than about possession of the goods, is what the carrier's arbitration program exists for. A carrier that refuses to release the shipment until a disputed weight-based charge is paid has moved into different territory, covered under a shipment held until more is paid. Scales themselves are regulated separately by state weights and measures officials, who license and seal commercial devices against a national technical standard.
Points to carry away
- Weight is taken either as tare-then-gross at origin or gross-then-tare at destination.
- The driver and any other person must be off the vehicle at both weighings.
- A shipment of 3,000 pounds or less may instead be weighed on a platform or warehouse scale.
- The shipper has the right to observe every weighing and to be told where and when it happens.
- A demanded reweigh replaces the original figure as the basis of the freight bill.
Questions readers ask
What information has to appear on a weight ticket?
Each weighing produces a separate ticket signed by the weigh master, and it must carry the complete name and location of the scale, the date of the weighing, whether the figure is tare, gross or net, the carrier identification of the vehicle, the shipper's last name as it appears on the bill of lading, and the shipment registration or bill of lading number. Where both weighings happen on the same scale, one ticket may record both. True copies must be included with any freight bill that depends on weight.
Can a shipper find out the weight before the truck arrives?
On a collect-on-delivery shipment the shipper may specifically request notice of the actual weight or volume and the charges, and the carrier must comply if given an address or telephone number. The notice has to reach the shipper at least one full twenty-four hour day before delivery is tendered, excluding weekends and federal holidays. The carrier may skip that notice where the shipment is back weighed, where pickup and delivery fall on two consecutive weekdays with the shipper's agreement, or where the shipper waives it on a non-binding estimate.
Does skipping the weighing mean the charges are void?
No, but it removes the carrier's proof. The freight bill on a weight-based shipment must include true copies of the weight tickets used to determine the shipment weight, so a carrier billing by weight without tickets is charging on a figure it cannot document. Raising that in writing before paying is more effective than raising it afterwards. Where the shipment moved on a binding estimate the weight is not the basis of the charge at all, and the argument moves to the inventory instead.
Sources
- 49 CFR 375.509 — How the weight is determinedSets the origin weigh and back weigh methods and the conditions for both weighings.
- 49 CFR 375.511 — Alternative method for light shipmentsPermits a platform or warehouse scale for shipments of 3,000 pounds or less.
- 49 CFR 375.513 — Opportunity to observe the weighingGives the shipper the right to watch every weighing and to be told where and when.
- 49 CFR 375.517 — Demanding a reweighAllows a reweigh before unloading and makes the reweigh figure the billing weight.
- 49 CFR 375.519 — Weight ticketsLists the six items each ticket must show and requires copies with the freight bill.
- 49 CFR 375.521 — Notice of actual weight before deliverySets the twenty-four hour notice rule on collect-on-delivery shipments and its exceptions.
- NIST Office of Weights and Measures handbooksPublishes Handbook 44, the technical standard states adopt for commercial weighing devices.
National Attorney Hub is a publication, not a law firm. This article states general rules and cites its sources; it is not advice about any particular case, and the law differs by state and changes over time.
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