Step 1
Empty it and set it on a flat floor
Not on a pallet, not on another box, not on gravel. A box measured on an uneven surface reads out of square when it is not.
Spec guide
How to measure a gaylord box.
Many wrong-size orders start with a tape measure in the wrong place. A few minutes here can save a load of boxes that do not fit the pallet, the rack or the trailer.
- Tools
- A tape and a flat floor
- Time
- A few minutes per box
- Convention
- Outside dimensions
Send your measurements
Got three numbers and a photograph? Put them in a quote request and a partner supplier follows up.
The answer, first
Put the box on a flat floor, empty and square. Measure length across the longer side of the base, width across the shorter side, and height from the floor to the top edge of the side wall. Take all three on the outside of the box, and say so when you send them. That is the whole method — everything below is about the edge cases that make it go wrong.
Inside or outside: the industry’s oldest ambiguity
A converting plant designs a box around what has to fit inside it, so their catalogue quotes inside dimensions. A used box seller is selling a physical object that must sit on a pallet and load onto a trailer, so they usually quote outside dimensions. For a five-wall bulk box, the difference is roughly three quarters of an inch per side, small enough to ignore in conversation and large enough to matter when a box has to drop into a rack bay or a frame.
The practical rule: work in outside dimensions for anything about space — pallets, racks, trailers, doorways — and inside dimensions for anything about product — cube, fill, liner sizing. State which you are using every single time, because the other party will assume the opposite.
| Construction | Wall thickness (each side) | Loss across a dimension | Volume effect |
|---|---|---|---|
| Single wall | ≈ 1/8 in | ≈ 1/4 in | Small |
| Double wall | ≈ 1/4 in | ≈ 1/2 in | Small |
| Triple wall | ≈ 1/2 in | ≈ 1 in | Modest |
| 4-wall bulk | ≈ 5/8 in | ≈ 1¼ in | Modest |
| 5-wall bulk | ≈ 3/4 in | ≈ 1½ in | A few per cent |
The three measurements that matter most
1 · Base footprint, outside
This decides pallet fit and trailer positions, and it is the one number people most often take from a memory rather than a tape. Measure at both ends of the base and in the middle: a box that has been stacked loaded for months will bow, and the middle will read wider than the ends. Quote the largest figure, because that is the one that has to clear the rack.
2 · Height to the top edge of the side wall
Not to the top of the flaps if they are standing, and not to the top of a telescoping cap. Side wall height determines stacking, trailer clearance and how far an operator has to reach. If the box uses a cap, measure the body and the cap overlap separately.
3 · Squareness
Measure both diagonals across the top opening. If they differ by a noticeable amount on a 48 × 40 box, the container has probably been overloaded, stored badly or crushed, and it should be graded down whatever its surface looks like. This is a measurement few people take, and a good predictor of failure.
Measuring an octabin
Round bodies are quoted by diameter across the flats — the widest point across two opposite faces, not the corner-to-corner distance — and by body height excluding the cap. The base tray is a separate measurement, normally matched to a 48 × 40 pallet. If you are replacing existing bins, measure the base tray as well; bodies and bases are not universally interchangeable between manufacturers.
What to send with a request
- Three outside dimensions, in inches, in L × W × H order.
- Whether the box is 4-wall, 5-wall or triple wall — or a photograph of the cut edge if you are unsure.
- A photograph of the whole box from a corner, plus one of the bottom edge.
- What it has to hold and how heavy that is.
With those four things a supplier can usually match you to a footprint faster, rather than trading emails narrowing it down.
Questions
Measuring, answered.
Are gaylord boxes measured inside or outside?
Both conventions exist, which is the root of most sizing confusion. Corrugated manufacturers usually quote inside dimensions because that is what the product has to fit into. Used box suppliers generally quote outside dimensions because that is what determines pallet fit and trailer loading. Always ask which convention a quote uses.
What order do the three dimensions go in?
Length, then width, then height - and length is conventionally the longer of the two base dimensions. A 48 x 40 x 36 box is 48 inches on the long side of the base, 40 inches on the short side, and 36 inches tall. Reversing the first two is harmless on a square footprint and expensive on a rectangular one.
What if the box is not square?
Measure at three points on each dimension and record the largest. A box that is noticeably out of square across its base has usually been stored badly or overloaded, and should be graded down regardless of how it looks otherwise.
Field procedure
Measuring a box properly, step by step.
Written as a procedure because that is how it gets done consistently by different people on different days.
Step 2
Push it square
Hands on opposite corners. If it will not square up, stop — you have learned the most important thing about this box already.
Step 3
Length, three readings
Across the longer base dimension at both ends and the middle, on the outside. Record the largest.
Step 4
Width, three readings
Same method on the shorter base dimension. Bowing shows here more often than on the length.
Step 5
Height to the top of the side wall
From the floor. Not to standing flaps, not including a cap. If there is a cap, measure the overlap separately.
Step 6
Both diagonals across the top opening
Corner to opposite corner, twice. A noticeable difference on a 48 × 40 is a downgrade.
Step 7
Board thickness at a cut edge
Calipers if you have them, a ruler against a cut flap if not. This identifies the construction when the stamp is illegible.
Step 8
Photograph and record
One corner shot, one bottom edge, one of the certificate stamp if legible. Write the readings on the box in marker.
Common errors
Eight ways a measurement goes wrong.
Each of these is a common cause of a wrong-size order.
- 01
Mixing conventions mid-conversation
You quote outside, they quote inside, and nobody says so. On a thick-walled box that can be an inch or more across a dimension, enough to miss a rack bay.
- 02
Measuring a box that is not square
Every reading is then wrong in a different direction. Square it first, or record that it will not square.
- 03
One reading per dimension
A bowed box reads correctly at the ends and wide in the middle. The middle is the number that has to clear the rack.
- 04
Measuring to the flap tips
Standing flaps add several inches of nothing. Height is to the top of the side wall.
- 05
Including the cap
A telescoping cap overlaps the body by several inches. Quoting the capped height makes the box sound taller than it is.
- 06
Measuring a damp box
Damp board swells measurably. The reading changes as it dries and the box is a downgrade anyway.
- 07
Trusting the printed size
Printed dimensions are what the box was ordered as, not necessarily what it is — particularly on remanufactured or re-sleeved containers.
- 08
Corner-to-corner on a round bin
Octabins are measured across the flats. Corner-to-corner overstates the diameter by several inches and will not match any base tray.
Three numbers and a photograph.
That is usually enough for a partner supplier to match you to a footprint and follow up with a quote.