The best way to ship large boxes is to keep each box as small and light as the contents allow, then compare USPS and UPS ground services for that exact size. USPS is often cheaper for large boxes up to 70 lbs, and UPS takes boxes up to 150 lbs and 165 inches in length plus girth. Anything heavier belongs on a pallet as LTL freight.
Size matters more than weight for big boxes. Both carriers bill large, light packages by dimensional weight, and both add charges once a box passes certain length, girth or weight thresholds. Staying just under those lines saves more than any other tactic.
What Are the Size and Weight Limits for Large Boxes?
Each carrier has a hard maximum. A box over the limit is refused or charged as an over-maximum package, so check these before you pack.
| Carrier / service | Max weight | Max size | Typical delivery |
|---|---|---|---|
| USPS Ground Advantage | 70 lbs | 130 in. length plus girth | 2–5 business days |
| USPS Priority Mail | 70 lbs | 108 in. length plus girth | 1–3 business days |
| UPS Ground | 150 lbs | 108 in. longest side, 165 in. length plus girth | 1–5 business days |
| LTL freight (PalletPath) | Palletized, well beyond parcel limits | Standard pallet footprint | Varies by lane |
To find length plus girth, measure the longest side (length), then add twice the width and twice the height. A 30 × 20 × 20 inch box comes to 30 + 40 + 40 = 110 inches. That’s too big for Priority Mail but fine for Ground Advantage or UPS Ground.
How Does Dimensional Weight Affect Large Boxes?
Dimensional (DIM) weight is a billing weight based on box volume: length × width × height divided by a divisor. The carrier charges whichever is higher, the actual weight or the DIM weight. Big boxes of light items, like pillows, lampshades or bedding, almost always bill by DIM weight.
UPS applies DIM weight to all packages with a divisor of 139. USPS applies it to packages larger than one cubic foot (1,728 cubic inches), and its Ground Advantage page now lists a divisor of 139 as well. Round every measurement up to the next whole inch before you calculate.
| Box size | Actual weight | DIM weight (÷139) | Billed as |
|---|---|---|---|
| 20 × 16 × 12 in. | 15 lbs | 28 lbs | 28 lbs (DIM) |
| 24 × 20 × 18 in. | 35 lbs | 63 lbs | 63 lbs (DIM) |
| 30 × 24 × 20 in. | 50 lbs | 104 lbs | 104 lbs (DIM). Exceeds USPS’s 70 lb max, so UPS or freight |
| 18 × 14 × 12 in. | 30 lbs | 22 lbs | 30 lbs (actual) |
The last row shows the goal. When a box is packed dense enough that its actual weight beats its DIM weight, you’re paying only for what’s inside. Shaving 2 inches off each side of the 24 × 20 × 18 box (to 22 × 18 × 16) drops its DIM weight from 63 to 46 lbs.
What Extra Charges Apply to Large Boxes?
Beyond the base rate, large boxes can trigger size-based charges. The thresholds below are the ones to design around.
- UPS Additional Handling: applies when the longest side is over 48 inches, the second-longest side is over 30 inches, or the actual weight is over 50 lbs. It also applies to boxes not fully encased in corrugated cardboard.
- UPS Large Package: applies when length plus girth exceeds 130 inches or the length exceeds 96 inches. These packages are billed at a minimum billable weight of 90 lbs.
- USPS nonstandard fees: apply to packages longer than 22 inches, longer than 30 inches, or larger than 2 cubic feet. Ground Advantage boxes between 108 and 130 inches in length plus girth also pay an oversized price.
- Residential and fuel surcharges apply to UPS deliveries, while USPS doesn’t add a residential surcharge.
Our detailed guide to shipping large boxes, dimensional weight and surcharges walks through each fee in more depth.
Is USPS or UPS Better for Shipping Large Boxes?
USPS usually wins for large boxes up to 70 lbs going to homes, especially when the box stays under 22 inches long and 2 cubic feet. UPS usually wins for heavy boxes over 70 lbs, for boxes going to businesses, and for boxes that need a firm delivery date.
| Your box | Usually the better fit | Why |
|---|---|---|
| Under 70 lbs, under 2 cu ft, going to a home | USPS Ground Advantage | No residential surcharge, and below USPS’s nonstandard thresholds |
| Under 70 lbs, needs speed | USPS Priority Mail | 1–3 business days, up to 108 in. length plus girth |
| 70–150 lbs | UPS Ground | USPS won’t accept over 70 lbs |
| Over 108 in. length plus girth, under 130 in. | Compare USPS Ground Advantage and UPS Ground | Too big for Priority Mail; both add size charges |
| Over 150 lbs, or many boxes to one address | LTL freight | Beyond parcel limits; one pallet beats many labels |
The only reliable answer for a specific box is a side-by-side quote. In the ParcelPath rate calculator you enter the weight and dimensions once and see USPS and UPS prices together, with discounts of up to 85% off UPS and up to 89% off USPS. ParcelPath is free to use, with no subscription, per-label fee or volume minimum. Our shipping calculator guide explains how each input changes the price.
How Should You Pack a Large Box?
Large boxes take more abuse on conveyors and in trailers, so pack them for drops and stacking.
- Use a new double-wall box for anything heavy. Reused boxes lose much of their crush strength.
- Leave about 2 inches of cushioning on every side, and no more. Extra space adds DIM weight.
- Fill voids completely so contents can’t shift. Shifting is the top cause of damage in big boxes.
- Tape with the H method: tape the center seam and both edge seams on the top and bottom with 2-inch pressure-sensitive tape.
- Label the largest flat side and remove or cover old labels. Our guide to addressing a box for shipping shows the correct layout, and the shipping labels guide covers printing and placement.
- Measure after you pack. Bulging sides add inches, so measure the sealed box and enter those numbers.
Some items need special handling. To ship a screen without its factory carton, follow the steps in how to ship a monitor. For small, flat items that don’t need a box at all, see whether bubble mailers count as packages. A good box cutter makes resizing a box quick and safe.
When Should a Large Box Ship as Freight Instead?
Switch to freight when a single box is over 150 lbs, when it exceeds UPS’s 165-inch length-plus-girth limit, or when you’re sending several heavy boxes to one address. Stacked and shrink-wrapped on a pallet, they move as one LTL shipment instead of many separate parcels, each with its own surcharges.
ParcelPath’s PalletPath service quotes LTL freight through the PalletPath freight quote tool. Our guide to LTL freight and logistics explains freight classes, pallet prep and liftgate service. If you’re comparing parcel, freight and other carriers more broadly, the roundup of shipping services and solutions covers each option.
Frequently Asked Questions
What is the cheapest way to ship a large box?
For a large box under 70 lbs going to a home, USPS Ground Advantage is often cheapest, as long as the box stays under the 22-inch and 2-cubic-foot nonstandard thresholds. Right-size the box to cut dimensional weight, then compare it with UPS Ground. Over 70 lbs, UPS Ground is the parcel option, and over 150 lbs, use LTL freight.
What is the largest box USPS will ship?
USPS Ground Advantage accepts packages up to 130 inches in combined length and girth and up to 70 lbs, although boxes over 108 inches pay an oversized price. Priority Mail and Priority Mail Express top out at 108 inches. To measure, add the longest side to twice the width plus twice the height.
What is the largest box UPS will ship?
UPS accepts packages up to 150 lbs, up to 108 inches on the longest side, and up to 165 inches in length plus girth. Packages over 130 inches in length plus girth, or longer than 96 inches, count as Large Packages and are billed at a minimum of 90 lbs. Bigger or heavier items must go as freight.
How do I avoid dimensional weight charges on large boxes?
Use the smallest box that fits the item plus about 2 inches of cushioning, measure the sealed box and round up to whole inches, and divide length × width × height by 139. If that number is higher than the scale weight, cut the box down or repack into a smaller one until the actual weight is the higher figure.
Sources
- USPS Ground Advantage: weight, size and dimensional weight rules
- UPS: Package Dimensions, Size Limits and Weight Guide
Part of our Packaging guide. Related: Shipping Resources, Are Bubble Mailers Considered Packages.
