Double wall, and mean it
A single-wall carton at a hundred pounds fails at the bottom flaps, usually on the second conveyor. Use double-wall board, tape the seams in an H pattern on both faces, and strap the box if the contents can shift.
Heavy parcels
What it costs to ship heavy items
Sixty pounds still behaves like an ordinary parcel. One hundred and twenty-five does not, and the change happens across a band of about fifty pounds where the cheapest price roughly doubles. On 2026-07-29 one 20 x 16 x 12 in carton went through our checkout at five weights on a single lane, Berkeley Heights, NJ to Denver, CO, and the rates are printed exactly as they came back.
Six weights, one cartonQuoted 2026-07-29Carrier ceilings cited
The ceiling is closer than it looks
Two of the six weights we ran produced nothing to buy. That is the edge of the parcel network, and it arrives at 150 lb.
One carton, six weights
Holding the box constant and moving only the scale figure isolates what weight alone is worth. The carton was described as a carton of hand tools each time, which is dense enough that its volume never took over the pricing.
| Packed weight | Cheapest price returned | Service | Transit the quote returned |
|---|---|---|---|
| 60 lb | $99.54 | FedEx Ground Economy | 6-7 business days |
| 75 lb | $109.81 | UPS Ground | 5-6 business days |
| 100 lb | $129.56 | UPS Ground | 5-6 business days |
| 125 lb | $213.66 | UPS Ground | 5-6 business days |
| 150 lb | no rates returned | — | — |
| 175 lb | no rates returned | — | — |
Forty pounds of extra cargo between the 60 and 100 lb rows added about thirty dollars. The next twenty-five pounds added more than eighty. Anyone sizing a shipment near that band is better off splitting it into two boxes and pricing both than assuming the ladder keeps climbing gently.
What sits between 100 and 125 lb
UPS publishes the answer on its own charge-avoidance page, read 2026-07-29. A domestic package is treated as a Large Package when its length plus girth passes 130 inches or its length passes 96 inches, and the same page adds a second pair of triggers: “if the package has a cubic size greater than 17,280 cubic inches or a weight greater than 110 lbs.” Large Packages then carry a floor, in UPS's words, of “a minimum billable weight of 90 pounds (40 kgs).”
Our carton measures 20 x 16 x 12 in. Its length plus girth is 76 inches and its cubic size is 3,840 cubic inches, so it is nowhere near the size triggers. The only one it can cross is the weight trigger at 110 lb, and that line falls squarely between the 100 lb quote at $129.56 and the 125 lb quote at $213.66. Two rows either side of a published threshold is not proof of causation, but it is where a shipper should expect the cliff.
The practical read: if the box is going to land between 100 and 130 lb, weigh it properly before you buy. A guess that turns out ten pounds light on a 110 lb parcel is not a rounding error, it is a different pricing regime, and the correction arrives on an invoice weeks later.
The economy tiers quit at 70 lb
At 60 lb five services priced the carton. At 75 lb and above, neither of the two cheap ones came back, and no Postal row appeared at any weight on this lane. That is not our filtering, it is published policy: FedEx sets Ground Economy at packages up to 70 lbs. and 130 inches in length plus girth, and USPS lists Ground Advantage at 70 lbs. Both read 2026-07-29.
| Carrier and service | Price | Carrier counter price | Transit returned |
|---|---|---|---|
| FedEx Ground Economy | $99.54 | $113.08 | 6-7 business days |
| UPS Ground | $100.37 | not returned | 5-6 business days |
| UPS Ground Saver | $102.63 | not returned | 5 days estimated, no window |
| UPS 3 Day Select | $158.00 | not returned | 5-6 business days |
| FedEx Ground | $173.15 | $177.80 | 5-6 business days |
Two things stand out in that board. The three-day tier returned the same 5-6 business day window as UPS Ground, so the extra money bought no time at all on this route. And the whole cheap end of the field vanishes one weight step later, which means a shipper packing to 68 lb rather than 72 lb keeps two options that a heavier box simply does not have.
Shape costs more than weight does
Heavy and large are different problems, and large is the expensive one. Three descriptions went down one lane within an hour of each other, and the lightest of the three priced highest by a wide margin.
| What we described | Box | Scale weight | Cheapest price |
|---|---|---|---|
| Carton of hand tools | 20 x 16 x 12 in | 60 lb | $99.54 FedEx Ground Economy |
| Boxed workbench top | 52 x 14 x 14 in | 60 lb | $100.94 FedEx Ground Economy |
| Large carton of packed household goods | 40 x 30 x 24 in | 45 lb | $256.68 UPS Ground |
The long box is the surprise. Its longest side is 52 inches, past the UPS additional handling trigger described on that carrier's page as “A package with the longest side exceeding 48 inches or second-longest side exceeding 30 inches”, and it still priced barely a dollar and a half above the compact carton at the same weight on this lane.
The third row is where the money went. That box measures 148 inches of length plus girth, past the 130 inch Large Package line, and its volume divided by 139 comes to roughly 207 lb of billable weight against 45 lb on the scale. It weighs three quarters of what the tools weigh and costs two and a half times as much to move. Density is a shipper's friend; empty space is not.
Distance still takes its share
| Destination | Cheapest price | Service | Transit returned |
|---|---|---|---|
| Philadelphia, PA 19103 | $97.11 | UPS Ground | 1 business day |
| Denver, CO 80202 | $129.56 | UPS Ground | 5-6 business days |
The identical hundred-pound box arrives next business day for less money one state away, and takes most of a working week to reach Colorado. Ground pricing on heavy freight-adjacent parcels is zone arithmetic before it is anything else, which is why a national average for heavy shipping is close to useless and a two-ZIP quote is not.
Where the parcel network stops
Both large carriers publish the same three ceilings, and they are worth memorizing before packing anything substantial. UPS puts them in three short lines on its own page: packages can be up to 150 pounds, up to 108 inches in length, and up to 165 inches in length and girth combined. FedEx publishes an identical set for FedEx Ground and Home Delivery. Both read 2026-07-29.
Our 150 lb and 175 lb runs sit at and above that ceiling, and both came back with nothing. Not an expensive price we disliked, an empty result set. That is the honest end of this page: past roughly a hundred and fifty pounds in one piece, there is no parcel label to buy, and the shipment belongs on a pallet.
Freight is priced by a person here rather than by the calculator, because the things that decide a freight rate are a loading dock, a liftgate and a handling unit count rather than a scale reading. Send the dimensions and both addresses through freight review and the answer comes back with the accessorials named. Anything still inside the ceilings above goes faster through the calculator.
Packing that survives a heavy box
Weigh on a real scale
Heavy parcels get re-weighed far more often than light ones, and a correction after delivery arrives as a separate charge. A bathroom scale reading taken by standing on it holding the box is fine at 20 lb and useless at 100.
Split before the threshold
Two 60 lb boxes keep the economy tiers in play and stay well under the 110 lb Large Package line. One 120 lb box loses both. Run the pair against the single before deciding, because the arithmetic often favors the pair.
Where these rules come from
- UPS, How to avoid shipping charge corrections — the 150 pound, 108 inch and 165 inch ceilings, the additional handling triggers, the Large Package triggers and the 90 pound minimum billable weight. Read 2026-07-29.
- FedEx, FedEx Ground — the matching 150 pound, 108 inch and 165 inch limits for FedEx Ground and Home Delivery. Read 2026-07-29.
- FedEx, FedEx Ground Economy — the 70 pound and 130 inch ceiling and the 2 to 7 business day range. Read 2026-07-29.
- USPS, Mail and shipping services — the 70 pound ceiling on Ground Advantage. Read 2026-07-29.
Limits and surcharge thresholds move when the carriers decide they should, usually at the turn of the year. What is printed above is what those pages said on the date shown, and the prices are one lane on one day rather than a rate card.
Common questions
How much does it cost to ship a heavy box?
On 2026-07-29 the same 20 by 16 by 12 in carton priced at $99.54 for 60 lb, $109.81 for 75 lb, $129.56 for 100 lb and $213.66 for 125 lb from New Jersey to Denver. A shorter lane comes in well under that, and the shape of the box can move the figure further than the scale does.
What is the heaviest package UPS and FedEx will take?
Both publish the same ceiling: 150 pounds, 108 inches of length, and 165 inches of length and girth combined. Read from ups.com and fedex.com on 2026-07-29. Our own runs at 150 lb and 175 lb on that day came back with no parcel rates at all.
Why did the price jump between 100 and 125 lb?
UPS publishes a Large Package rule that catches a package with a cubic size greater than 17,280 cubic inches or a weight greater than 110 lbs, and applies a minimum billable weight of 90 pounds to those. The 110 lb line falls between the two weights we quoted, and the cheapest price went from $129.56 to $213.66.
Why do the cheap services disappear above 70 lb?
Their published ceilings sit there. FedEx states that Ground Economy takes packages up to 70 lbs and 130 inches in length plus girth, and USPS lists Ground Advantage at 70 lbs. Above that the field on our lane narrowed to UPS Ground and FedEx Ground.
When does a heavy item stop being a parcel?
At the published weight and size ceilings, or earlier when several heavy pieces travel together. Past that point the shipment goes to a freight review and a person prices it, because no parcel label can be issued for it.