Round the weight up, not the price
Bands mean a parcel that reads 15.8 lb on a bathroom scale might bill at 16. Weigh the sealed box on something accurate before you buy.
A number that does not exist
How much does USPS charge per pound?
It does not charge per pound, and neither does UPS or FedEx on parcels. Weight puts a box in a band, the destination puts it in a zone, and the price is the cell where those two meet, with the size of the carton able to override the scale entirely. Divide eight real quotes by their own weight and the implied per-pound figure slides from $17.72 down to $0.90 on one route.
Eight live quotesArithmetic shownNewark to Atlanta, 2026-07-28
Bands, not multiplication
The second pound and the fortieth pound are priced by different logic. No single rate connects them.
The curve, with the division shown
Eight parcels, one lane, one day. Each was quoted through our calculator on 2026-07-28 from Newark, NJ 07102 to Atlanta, GA 30303, and the last column is our own arithmetic: the cheapest price returned, divided by the weight on the scale. The boxes grow with the weight, deliberately, because that is what real parcels do.
| Weight | Box | Cheapest rate returned | Price | Price per pound |
|---|---|---|---|---|
| 8 oz | 9 x 6 x 3 in | USPS Ground Advantage | $8.86 | $17.72 |
| 1 lb | 10 x 8 x 4 in | USPS Ground Advantage | $9.91 | $9.91 |
| 2 lb | 12 x 9 x 4 in | USPS Ground Advantage | $8.48 | $4.24 |
| 4 lb | 12 x 10 x 6 in | USPS Ground Advantage | $8.48 | $2.12 |
| 8 lb | 14 x 12 x 8 in | FedEx Ground Economy | $15.64 | $1.96 |
| 16 lb | 16 x 14 x 10 in | UPS Ground Saver | $20.50 | $1.28 |
| 32 lb | 20 x 16 x 12 in | UPS Ground | $32.09 | $1.00 |
| 50 lb | 24 x 18 x 14 in | UPS Ground | $45.01 | $0.90 |
The implied rate falls by a factor of nearly twenty from top to bottom. Any sentence beginning with the words shipping costs about a dollar a pound is describing exactly one row of that table and misdescribing the other seven.
Two of the rows break the curve outright. The 2 lb and 4 lb parcels both quoted $8.48, so the third and fourth pounds were carried for nothing, and the 1 lb parcel cost more than either of them.
Why the model fails
Three separate mechanisms are working against the idea of a per-pound rate, and each one alone would be enough to break it.
- Bands, not increments. Prices are published against weight steps, not against every ounce. A parcel sitting just inside a band pays the same as one at the top of it, which is why the 2 lb and 4 lb rows above are identical.
- Zones. The same box costs different money to different cities, so any per-pound figure is only true for one lane. Change the destination and the arithmetic starts again.
- Volume can outrank the scale. USPS bills parcels over one cubic foot on actual or dimensional weight, whichever is greater, under DMM 223.1.4. A large light carton is charged as though it were heavier than it is, and the scale reading becomes decoration.
There is also a floor under everything. The lightest parcel here weighed half a pound and still cost $8.86, because collecting, scanning and delivering a parcel has a cost that does not shrink with the contents.
Where the per-pound question does belong
The searches that produce freight tables are not wrong, they are answering a different question. Freight is quoted per hundredweight against a freight class and a lane, and that basis genuinely is weight-driven in a way parcel pricing is not. It also starts where parcel service stops: USPS caps a mailpiece at 70 pounds, and UPS publishes a parcel ceiling of 150 lbs with 108 inches of length and 165 inches of length and girth combined.
We sell US domestic parcel labels, not freight. If the shipment is palletised, over those limits, or needs a liftgate at either end, send the details through our freight review form and it gets handled as freight rather than squeezed into a label.
The floor is the story at the light end
Under about two pounds the price barely tracks the scale at all. Shaving ounces off a small parcel rarely pays; shaving inches sometimes does.
Heavy is where the grid gets generous
Fifty pounds cost $45.01 on this lane, about 38 cents less per pound than sixteen pounds did. Consolidating two medium boxes into one heavy one is often the cheaper move.
Per-pound pricing, answered
How much does USPS charge per pound?
There is no per-pound price to quote. Ground Advantage is priced from a grid of weight bands against zones, so the cost of the second pound is nothing like the cost of the fortieth. Our 2026-07-28 quotes from Newark to Atlanta work out at $9.91 a pound at 1 lb and $0.90 a pound at 50 lb.
Why did a heavier parcel cost less than a lighter one?
On the same route on 2026-07-28 a 1 lb parcel in a 10 x 8 x 4 in box quoted $9.91 while a 2 lb parcel in a 12 x 9 x 4 in box quoted $8.48. The two landed in different cells of the grid and the lighter one landed in the dearer cell, which a per-pound model cannot describe at all.
What per-pound figure should I budget with?
None of them travel. A figure taken from a 50 lb carton understates a 1 lb parcel by a factor of eleven on our own numbers, and neither figure survives a change of zone. Quote the box you are sending, to the address you are sending it to.
Is freight priced per pound?
Freight uses a different basis, usually per hundredweight against a class and a lane, which is why searches for a per-pound rate fill up with results that have nothing to do with parcels. We do not sell freight labels, so palletised or oversized shipments go through our freight review form instead.