Box guide
Standard Cardboard Box Sizes
Common US box sizes in inches, what each one holds, and how to choose the right size for your products.
Is there a standard cardboard box size in the US?
Not officially. No agency sets one list that every maker follows. What you see instead is a set of familiar sizes that suppliers, warehouses and shippers have settled on over the years.
Most of them are round inch figures, such as 12 × 9 × 4 in (305 × 229 × 102 mm). That is why buyers on the phone usually say sizes in inches, length first.
We make every box to the inside size you give us, so you can use these sizes as a starting point and still change them. If a box is half an inch too tall for your product, we simply cut it shorter.
Think of the common sizes as a shortlist. They show what other sellers pack, and they help you spot a size that nearly fits before you order something exact.
Which box sizes do US businesses order most?
The table lists inside sizes as length × width × height. These are typical examples, not stock items, because each order is cut to your numbers.
| Inside size (L × W × H) | Millimeters (approx.) | Good for |
|---|---|---|
| 6 × 6 × 6 in | 152 × 152 × 152 | Candles, mugs, small plants |
| 8 × 6 × 4 in | 203 × 152 × 102 | Phone cases, cosmetics, soap bars |
| 9 × 6 × 3 in | 229 × 152 × 76 | Greeting cards, jewelry sets, samples |
| 10 × 8 × 4 in | 254 × 203 × 102 | T-shirts, paperbacks, small gift sets |
| 12 × 9 × 4 in | 305 × 229 × 102 | Folded sweaters, hardcovers, subscription kits |
| 12 × 9 × 2 in | 305 × 229 × 51 | Letter-size paper, prints, flat catalogs |
| 12 × 12 × 6 in | 305 × 305 × 152 | Vinyl records, board games, kitchenware |
| 14 × 10 × 6 in | 356 × 254 × 152 | Shoes, boots for kids, gift baskets |
| 16 × 12 × 8 in | 406 × 305 × 203 | Small appliances, bulk stock, files |
| 18 × 18 × 16 in | 457 × 457 × 406 | Bedding, pillows, light bulky goods |
| 24 × 18 × 18 in | 610 × 457 × 457 | Large orders, seasonal decor, storage |
What size box works for small items and Etsy orders?
Small sellers often ship items under 10 inches on the longest side. Think jewelry, lip balm, stickers, candles and candy.
For these, keep the height low. A flat 8 × 6 × 2 in box usually costs less to ship than a 6 × 6 × 6 in cube holding the same item.
Thin E flute board, about 1/16 in (1.5 mm), keeps small boxes neat and light. You can see the options on our page for small cardboard boxes cut to size.
Adult shoe boxes sit at the top of this group, often near 13 × 8 × 5 in inside. Kids' pairs run closer to 9 × 6 × 4 in.
What sizes fit clothing, books and subscription kits?
Apparel brands usually need two sizes. A shallow box, around 12 × 9 × 3 in, takes a folded tee or leggings. A deeper one, near 14 × 10 × 5 in, takes a hoodie or jeans.
Book sellers should measure the largest title first. A typical hardcover is about 9 × 6 × 1.5 in, so a 10 × 7 × 2 in box leaves a snug margin.
Subscription brands can pick one hero size and fill it differently each month. A 12 × 9 × 4 in box suits most kits, and our printed mailer boxes for monthly kits come in that range.
Paper sizes help too. A letter sheet is 11 × 8.5 in, so a box about 12 × 9 in inside takes it flat with room for a thin sleeve.
What box sizes suit storage, offices and moving?
Offices tend to use a standard file box, near 15 × 12 × 10 in inside, for letter or legal folders. Warehouses lean on 16 × 12 × 12 in and 18 × 12 × 12 in for parts and returns.
Keep dense goods in smaller boxes. A 16 × 12 × 12 in box full of hardcover books can pass 40 lb, which is hard to lift safely.
Light, bulky things such as pillows or lampshades belong in the big boxes. The range on our page for large boxes for bulky goods starts around 18 in on the longest side.
We do not publish load ratings. Once a box feels heavy to carry, step up to double wall BC flute, about 1/4 in (7 mm) thick.
How do you size boxes to fit a pallet?
The common US pallet footprint is 48 × 40 in. If your boxes will ride on pallets, pick sizes that divide into it without overhang.
A 12 × 10 in box footprint gives 16 boxes per layer, in four rows of four. A 24 × 20 in footprint gives 4 per layer, two by two.
Overhang is the thing to avoid. Board that hangs past the pallet edge is easy to crush and can snag in a warehouse.
Ask your receiving team for their stack height limit before a large run. Put the heaviest boxes at the bottom of each stack.
How do you choose the right box size, step by step?
Work through these steps before you request a quote. Our guide to measuring your product for a box adds photos and examples.
- Measure your product at its longest, widest and tallest points, in inches.
- Add padding: 1/4 to 1/2 in (6 to 13 mm) per side for sturdy goods, 1 to 2 in (25 to 50 mm) for fragile ones.
- Decide which face opens, because that side sets the height.
- Write the result as inside length × width × height.
- Check whether shaving an inch off the height keeps the package in a lower shipping size bracket.
- Pick the board and print, then ask for a quote and a free proof.
Why do inside and outside sizes differ?
We quote inside sizes, because that is the space your product needs. The outside is bigger by the board thickness on each side.
E flute adds about 1/8 in (3 mm) to each outside dimension. B flute adds about 1/4 in (6 mm). Double wall BC flute adds about 1/2 in (14 mm).
A box of 12 × 8 × 4 in inside, in double wall, measures roughly 12.5 × 8.5 × 4.5 in outside. Our flute thickness guide for each board helps with this math.
Outside size matters when the box must fit a shelf, a locker, a shipping bracket or a sleeve.
How does box size affect shipping cost?
US carriers price packages by size, weight and dimensional (DIM) weight. DIM weight turns a box's volume into a billable weight, so a large, light box can cost like a heavy one.
That makes extra air expensive. Trimming one inch from each dimension of a 12 × 12 × 12 in box cuts its volume by about a quarter.
Your quote includes free tracked shipping to our customers' addresses, but your own outbound packages still count. See our notes on keeping package shipping costs down for more ideas.
Which sizing mistakes should you avoid?
A few errors cause most boxes that do not fit. Run your numbers past the list below before you send them to us.
- Sending outside sizes when inside sizes are needed
- Swapping width and height on a box that opens at the end
- Measuring the product but forgetting its wrapping or sleeve
- Rounding 11.75 in up to 12 in before checking the fit
- Ordering a box far too large and filling the gap with paper
- Forgetting that double wall adds about 1/2 in outside
How many box sizes should your business keep?
Fewer than most people expect. Every extra size means another proof, another stack to store and a smaller run for each.
Most small shops do well with three: small, medium and large. Busy stores with a wide catalog might run five. Sort your last quarter's orders by product and see which sizes cover most of them.
A product that sells a few times a month can ride in the next size up with a divider. Save custom sizes for your best sellers, then ask for a quote by email and we reply within one business day.
