A picture frame box has to survive the one thing frames are bad at: a flat impact on a rigid, brittle panel. Sizing is where most of that protection is won or lost, because protection that has nowhere to sit does not get fitted.
Step one, measure the frame, not the print
Print sizes such as 5 x 7, 8 x 10, 11 x 14, 16 x 20 and 18 x 24 in are standard, and they tell you almost nothing about the box. What the box needs is the outside of the moulding at its widest, the total depth from the glass face to the highest point on the back, and the filled weight.
| Measurement | Why it matters |
|---|---|
| Outer moulding, long edge | Sets internal length before any protection is added |
| Outer moulding, short edge | Sets internal width before any protection is added |
| Total depth, face to hardware | Sets internal depth, including wire, D rings, a stand or a bumper |
| Filled weight | Decides single wall or double wall, and whether the box needs a stiffener |
| Glazing type | Glass needs more protection and a face barrier; acrylic scratches instead of breaking |
Step two, add the protection into the dimension
Corner protectors are the single most effective thing you can put in a frame box, because a corner drop is how frames break. Whatever you choose, foam corners, moulded pulp or die cut corrugated corners, measure their wall thickness and add it to the internal length and width. Two protectors on opposite corners of an axis means adding that thickness twice. Then decide the face: a thin sheet, a bag or a slip of foam over the glazing keeps board fibre and dust off the surface and stops a broken pane moving if the worst happens.
A frame box does not need much air inside it. Once the protectors are in, the fit should be snug enough that the frame cannot build up speed inside the carton. Loose is worse than tight.
Step three, decide the shape of the box
There are three practical shapes, and they are not interchangeable.
- A telescoping two piece, where a lid slides over a base. Good for a range of depths from one die, and strong at the edges.
- A book wrap or fold-around mailer, which wraps the frame and locks. Efficient for slim frames going to consumers.
- A regular slotted carton with pads. Cheapest, and only suitable with real corner protection inside.
For unglazed canvases the calculation is different, and it is set out on canvas box dimensions, where the profile depth rather than the glazing is the deciding factor.
Ordering, minimum and lead time
The minimum is 100 boxes, priced from about $0.48 per unit at bulk volumes and confirmed on your written quote. The die, the plates, design support, US shipping and a digital proof before anything prints are included, which is why sizing a box to your exact moulding and protector combination is not more expensive than settling for a standard one. Production is quoted per product across three lanes, rush (expedited production plus air freight), standard (air) and cost saver (sea), from about 7 business days, plus 2 to 5 for delivery. Two plants make the work, West Chicago and Guangzhou.
Send the outer moulding dimensions, the depth including hardware, the glazing type and the filled weight with your quote request. If you are choosing between sizes for a mixed range rather than a single frame, what size picture frame box do I need works through that decision directly.
