5 Gallon Bucket Dimensions: Top and Bottom Don't Match

The number on a "5-gallon" pail is a volume. The number a buyer measures with a tape is a diameter. Those are two different things, and the gap between them is where the freight quote and the liner order both go wrong.

A standard 5-gallon pail is about 11.9 inches across the top, 10.3 inches across the bottom, and 14.5 inches tall — three dimensions for a container everyone calls by a single number. Get the top and bottom diameters mixed up and you over-quote the pallet by an inch of wasted width on every unit; quote the imperial gallon and you promise a buyer 20% more liquid than the pail can hold.

This is the whole spec, in tables, plus what "5 gallons" actually means and how to put the numbers on a listing so the buyer, the liner supplier and the freight calculator all read from the same figure.

Every standard pail size, in one table

Round plastic pails scale predictably. The two columns that trip people up are the first two: the top is always wider than the bottom, and they are not interchangeable.

Source: U.S. Plastic Corp — Standard 5 gallon bucket, cross-checked against U.S. Plastic Corp — Round plastic buckets & pails (2026). Sizes vary a little by moulder and revision — treat these as the reference band, not a tolerance.

The full set of standard container references — including steel drums, jerry cans and IBC totes — sits in the standard bucket and pail dimensions reference.

The heavy-duty 5-gallon pail

The 90-mil pail is the version that ships full, stacks loaded and takes a UN rating. It is a hair wider at the base and slightly taller than the standard pail.

Source: The Cary Company — 5 gallon white plastic pail, 90 mil (2026).

Why the top and bottom diameters are different

A pail is not a cylinder. It is a truncated cone — wider at the rim, narrower at the base — and the taper is deliberate. It is what lets empty pails nest inside one another for shipping, and what lets filled pails stack in a stable column.

The practical consequence: the taper stacks up to a bit over an inch of diameter difference on a 5-gallon pail, which is exactly the kind of number that turns a tight container load into an over-width pallet or a liner that won't seat.

Two numbers, two jobs:

• Top outside diameter decides the lid, the rim, the liner's outer fit, and whether the pails pack two-across on a pallet.
• Bottom outside diameter decides nesting depth, the base footprint on a shelf, and how many units stand side by side once nested.

If your spec block lists one "diameter," a buyer cannot tell which end you measured. State both, and label them.

Nesting is a freight number, not a footnote

Because the taper lets them nest, empty 5-gallon pails ship roughly 240 to a pallet — a figure that matters far more than any single pail dimension when you are quoting an export cube. Filled pails cannot nest, so the same pallet holds far fewer. The two loadings need two different numbers on the quotation.

What "5 gallons" actually means

Here is the part most spec sheets leave out: "gallon" is not one unit.

• The US liquid gallon is 231 cubic inches, or 3.785 L. Five of those is 18.9 L.
• The imperial gallon is 4.546 L. Five of those is 22.7 L.

Same two words, one fifth more volume. A US buyer and a UK buyer asking for "a 5-gallon pail" are describing cans that differ by almost 4 litres. The imperial gallon is defined in the UK Weights and Measures Act 1985; the US gallon's 231-cubic-inch definition is carried in NIST Handbook 44, the US weights-and-measures rulebook.

The nail sentence: a "5-gallon bucket" holds 18.9 litres in the US and 22.7 litres in the UK — the same name buys 20% more volume.

Nominal capacity is not fill line

The 18.9 L on the label is the practical fill, not the brim. A pail is designed with headspace above the fill line so the lid seats, product can expand, and the pail survives a stack without pressurising. That is the same nominal-versus-actual trap that catches a "2×4," an "8×8×16 block" and a "10×13 poly mailer" — the name is a category, the measurement is the truth. The wider pattern is unpacked in nominal vs actual dimensions.

So when a buyer asks "is it really 5 gallons?", the honest answer is: 18.9 L of practical fill in a pail built with headspace, and here are the three dimensions that prove it.

How to measure a pail the way buyers mean it

A measurement that cannot be repeated by the buyer is not a spec. Measure a round pail like this:

1. Top outside diameter — across the outside of the rim at its widest, lid off.
2. Bottom outside diameter — across the outside of the base, at the very bottom.
3. Height — base to rim, lid off; then measure again with the lid on, because a snap-on lid adds roughly 0.5–1 in to overall height.
4. State the units twice — inches and millimetres. A single set of units is a translation error waiting to happen for an overseas buyer.
5. Write which end each diameter is — "top OD" and "bottom OD," never a bare "diameter."

The capability that keeps this honest is unglamorous: measure the real pail and lock the measured dimensions onto the product photo where the buyer actually looks, then export the same figures at the platform's spec size. Snap-to-edge measurement pins the line to the real rim and base; a number typed over a picture, or a plausible-looking dimension an image generator invented, is a guess wearing a label. Marking the two diameters directly on the pail photo is what stops the "which end is 11.9?" email before it is written. If you build these for industrial containers, the industrial spec diagram maker is the matching workflow.

The UN-rated pail: what the code tells you

A pail that ships regulated goods carries a UN code, and it is a spec sheet in miniature. A common 5-gallon plastic pail reads something like 1H2/Y27/S.

Decoded, using the marking rules in 49 CFR 178.503:

The letters matter. X covers Packing Group I, II and III; Y covers II and III only; Z covers III only. Sell a Y-rated pail for a Packing Group I good and the document is wrong even if the pail is undamaged. The size ceilings live in 49 CFR 178.509: plastic drums (1H1, 1H2) top out at 450 L and 400 kg net mass, while a jerrican (3H1, 3H2) is capped at 60 L and 120 kg. Steel counterparts follow 49 CFR 178.504 at the same 450 L / 400 kg ceiling. A 5-gallon pail sits well inside all of these, but the marking is what your buyer's compliance file will ask for. The full decode is in how to read a UN packaging code.

One thing the UN code is not: a dimension. It will not tell a buyer how wide the pail is, and it does not replace the tape. Publish both.

Is it a bucket or a pail?

In everyday English, bucket and pail mean the same thing, and most dictionaries treat them as synonyms. In packaging and shipping, the trade term is pail — the straight-sided, open-head container with a bail handle that the UN code calls a drum. Industry usage often reserves "pail" for containers up to about 5 gallons and "bucket" for the loose, consumer-facing sense.

The distinction is worth one line, not an argument. What a buyer can act on is the geometry, not the noun: top OD, bottom OD, height, and which gallon you mean. Get the noun "wrong" and nobody returns a container; get the bottom diameter wrong and the liner order comes back.

The spec block to put on the listing

Copy this into the listing, the quotation and the photo annotation, and use the same figures in all three places:

The failure mode is never the missing row — it is the contradiction: the photo says 11.9, the spec table says 12, and the title rounds to "12-inch." Three numbers for one pail reads as three pails, and a mismatch between them is itself a "not as described" claim.

Pre-send checklist

• Top OD and bottom OD both stated, each labelled which end it is
• Height given lid-off, with the lid-on height noted separately
• Capacity written as US gallons and litres, with the gallon system named
• Units given in both inches and millimetres
• UN code transcribed in full if the pail is rated (and the Y/X/Z scope checked)
• Pallet count split into nested-empty vs filled
• Every figure identical across image annotation, spec table and title
• At least one product image carries the measured dimensions, locked to the real edges

FAQ

What are the dimensions of a 5-gallon bucket?

A standard 5-gallon (18.9 L) plastic pail is about 11.9 in (303 mm) top outside diameter, 10.3 in (262 mm) bottom outside diameter, and 14.5 in (368 mm) tall without a lid. The top is wider than the bottom because the pail is tapered so empties can nest.

How tall is a 5-gallon bucket with the lid on?

Without a lid a standard pail is about 14.5 in (368 mm), and a heavy-duty 90-mil pail runs about 14.6 in (371 mm). A snap-on lid adds roughly 0.5–1 in to the stacked height, so measure lid-on whenever the buyer is fitting the pail into a shelf, a case or a container.

How many 5-gallon buckets fit on a pallet?

Empty 5-gallon pails nest, so about 240 ship per pallet (two stacked cases of roughly 120). Filled pails cannot nest, so a pallet carries far fewer — quote the two loadings separately, because the nested figure is the one that flatters an export cube.

How do I measure a pail for export?

Measure the top outside diameter at the rim with the lid off, the bottom outside diameter at the base, and the height base-to-rim both with and without the lid. Record every figure in inches and millimetres, label which end each diameter belongs to, and repeat the identical numbers on the photo, the spec table and the title.

Is a pail the same as a bucket?

In ordinary usage yes, and dictionaries list them as synonyms. In packaging and shipping the trade term is "pail" — the open-head, bail-handle container the UN marking rules code as a drum. The difference that matters commercially is not the noun but the geometry: top diameter, bottom diameter, height and which gallon you mean.

Sources & References

• U.S. Plastic Corp — Standard 5 gallon bucket (standard pail dimensions)
• U.S. Plastic Corp — Round plastic buckets & pails (1–5 gallon size table)
• The Cary Company — 5 gallon white plastic pail, 90 mil (heavy-duty dimensions and weight)
• eCFR — 49 CFR 178.503, marking of packagings (X/Y/Z packing-group letters, gross mass, S)
• eCFR — 49 CFR 178.509, plastic drums and jerricans (1H1/1H2 max 450 L / 400 kg; 3H1/3H2 max 60 L / 120 kg)
• eCFR — 49 CFR 178.504, steel drums (max 450 L / 400 kg)
• NIST Handbook 44 — Specifications, tolerances and other technical requirements for weighing and measuring devices (US liquid gallon = 231 in³)
• UK Weights and Measures Act 1985 (imperial gallon = 4.54609 L)