Standard Kitchen Sink Sizes: Dimensions Chart (Inches & mm)

In retail, a sink that measures half an inch off its label is an inconvenience. In wholesale, it is a claim, a container re-plan or a returned pallet. Before a single carton is booked, sink dimensions drive four decisions: the base cabinet specification, the countertop cut-out, the carton and pallet design, and the landed cost calculated from volume and weight.

Yet most size charts in circulation are retail collateral: nominal widths, industry-typical depths, and neither of the two numbers a buyer actually needs — the exact outer dimensions of a specific model, and the tolerance those dimensions land in after firing. Every figure below is the drawn value of a model we currently fire — twenty-one fireclay kitchen sinks across single bowl, double bowl, workstation and inset formats, published in both inches and millimetres.

If you source for a market that works in metric drawings, the millimetre column is the one your cabinet maker quotes against. If you source for North America, the inch column is how the model is labelled and searched. They are two different targets, and the next sections explain why.

The single bowl farmhouse segment clusters around four nominal width classes: 24, 30, 33 and 36 inches. Within each class, the actual outer width varies by model — which is precisely why a class-level chart is not enough for cabinet planning. The table below lists one representative model per size point in our range, with the exact outer dimensions as drawn.

Two things are worth reading from the numbers. The 30-inch class spans more than an inch of real width: our S12156 measures 29.75 inches across, the S12132 measures 32.75 — close enough to the 33-inch class to plan as one. Bowl depth is not uniform either: fired bowls in this group run from 8.74 to 10 inches, which decides how the sink reads against a 36-inch worktop and how much the user bends.

Double bowl fireclay sinks are specified where washing and rinsing need to happen side by side — and the trade-off is baked into the arithmetic: splitting the outer width halves each basin, so a double bowl under about 30 inches leaves basins too narrow for a dinner plate laid flat. That is why ordered volume in this segment concentrates at 32 to 33 inches nominal.

All five double bowl models in our current range are equal 50/50 splits, and four of the five are workstation bodies with an integrated accessory ledge across the top. The S2014E-Series is drawn at two nominal widths — 33 and 36 inches — sharing one bowl architecture across two cabinet classes.

Note the last row: the S332025E gives up three millimetres of body depth against its siblings — invisible on a sales page, decisive in a cabinet with a fixed backsplash clearance.

An apron-front farmhouse sink replaces the countertop's front edge with the sink's own fired face. That single change makes three dimensions matter that a drop-in buyer never thinks about. The apron height — typically 8 to 10 inches industry-wide — dictates how much face frame is removed. The front-to-back body depth (19.75 to 20 inches in our range) dictates the cabinet's internal depth. The weight — the number most charts leave out entirely — dictates the internal support structure.

Fired weights across our farmhouse range run from 35.65 kg (about 79 lb) at the compact 24-inch end to 53.95 kg (about 119 lb) for the largest double bowl workstation. Add water, dishes and a leaning user, and a filled sink can briefly exceed 90 kilograms. That load is carried by a level internal cradle or frame inside the base cabinet — not by the countertop, and not by the caulk line.

Our inset CD-series models, by contrast, sit at 24.75 to 30.95 kg (about 55 to 68 lb) because the body is a slimmer 222 to 225 mm front-to-back.

This is the section most size charts cannot write, because most publishers have never stood next to a kiln. A fireclay sink is cast wet, dried, then fired at 1280°C. At that temperature the body densifies and the whole sink shrinks — every wall, every radius, every dimension. The dimension that survives on the drawing is the fired target: the millimetre figure the mould and process are tuned to hit after shrinkage, not before.

This is also why the inch label and the millimetre column are different kinds of number. The inch figure is the nominal marketing class — 33-inch, 36-inch. The millimetre figure is the engineering target the factory holds itself to: 838 x 510 mm, exactly. A 36-inch-class model measures 35.75 inches at the rim because 908 mm is the fired target. Neither number is wrong; they answer different questions.

What the buyer should plan around is the tolerance. Fired ceramic carries dimensional variation of around two per cent, which is why responsible specifications — ours included — state dimensions as drawn targets with a stated tolerance, and why the worktop is always templated from the delivered sink. A fabricator who cuts stone from a PDF before the sink is on site is gambling a countertop on a percentage.

The practical buying question is not whether a supplier admits shrinkage — every maker of fired ceramic lives with it — but whether they can state the target, the tolerance and the inspection method in one breath. Ask before the order, not after.

Undermount installation changes which dimension leads. A farmhouse or drop-in sink presents its outer width; an undermount sink presents its bowl, and the cut-out is built around the outer dimensions with a reveal — a small overhang of countertop past the rim, or a flush mount where the fabricator prefers the rim level with the stone.

Our S12162 illustrates the format: 30.0 x 18.0 x 10.0 inches (762 x 457 x 254 mm) overall, with the narrower 18-inch front-to-back footprint undermount bodies use to clear drawers and fittings below a standard 24-inch-deep counter run. At 33.3 kg (about 73 lb) it is also the lightest body in the range.

Because the cut-out is cut to the sink, the tolerance conversation from the previous section applies with full force: state the outer dimensions and the requested reveal at order time, and template from the delivered piece.

Cabinet pairing follows one of two rules, and the failure to distinguish them is the most common sizing error in this category. The first is the exact-fill farmhouse base: a dedicated apron-front cabinet whose opening matches the sink's outer width, so the apron and rim fill the frame with only a small reveal. A 33-inch-class sink goes into a 33-inch farmhouse base; a 36-inch-class sink into a 36-inch base.

The second is the retrofit install: dropping an apron sink into a standard sink base by cutting down the face frame. Here the sink must be narrower than the cabinet by roughly three inches to leave the frame stiles intact — a 30-inch-class body into a 33-inch standard base. Charts that state only one rule produce contradicting advice, which is exactly the confusion a class-level table creates.

The reliable habit costs nothing: read the minimum base cabinet requirement off the specific model's specification — published on every product page — and confirm the internal clearance between the cabinet side panels, not across the face frame.

Drain outlets follow the 3.5-inch (about 89 mm) standard opening across the North American kitchen market, and our entire range is tooled to it — the same basket strainer, disposal flange and trap hardware fits every model in the catalogue.

Fireclay farmhouse bodies are cast without faucet deck holes: the apron front leaves no deck, so the faucet mounts through the worktop or the wall. That is the architecture, not an omission — but confirm it on the drawing before ordering, together with whether a soap dispenser or filtered-water opening needs to be cut by the fabricator.

On accessories, the range ships with a bottom grid and basket strainer as standard on every model, and the twelve workstation bodies add the integrated ledge system: a track cast at the top of the bowl that carries rolling racks, cutting boards and drainer trays at worktop height. Accessory racks are dimensioned per model — a 33-inch workstation rack does not fit a 30-inch body — so plan accessory counts per model, not per container.

Secondary sinks follow different economics: shorter shifts, counter space competing with prep area, and usually a top-mount install to keep cabinet costs down. The sizing conversation shifts from width classes to footprint and depth.

Our CD-series covers this segment in three drawn sizes: a 33.86-inch single bowl (860 x 500 x 222 mm), a 39.37-inch single bowl (1000 x 500 x 222 mm), and a 39.37-inch 1.5-bowl with an asymmetric layout (1000 x 500 x 225 mm). All three are inset bodies with a drainer moulded into the fired top surface — part of the casting, not an accessory rack — and at 222 to 225 mm of body depth they sit shallower than any farmhouse body in the range, keeping the trap and under-sink storage clear.

For importers, the segment's value is assortment economics: three SKUs cover the compact-prep, full-prep and wash-and-drain use cases on one tooling family and one carton architecture.

Mounting height is a worktop decision, but sink geometry constrains it. The common North American worktop sits at 36 inches; European runs are similar; a fireclay farmhouse body with a 9.88 to 10-inch fired bowl leaves roughly 26 inches of clear space under the rim — enough for most users to work without stooping, and shallow enough that tall users are not reaching into a well.

Two adjustments matter in planning. First, deeper bowls raise the working surface of the wash: a bottom grid, which ships with every model here, lifts items about half an inch and protects the glaze at the same time. Second, because an apron front clamps the sink to a fixed height relative to the cabinet face, the apron height and the cabinet's face-frame cut have to agree — which is why the apron dimension appears on every drawing we issue, as an installation datum.

For accessibility-oriented projects, the sink is rarely the constraint: a non-porous glazed bowl mounted at a planned height with clear knee space below (in an undermount format) serves better than any nominal size class.

The same nominal size behaves differently in different materials, and the difference is dimensional, not just aesthetic. Stainless steel is formed, not fired: it holds a listed size closely and weighs a fraction of a fired body — but thin walls flex and sound travels. Granite composite is cast from mineral-filled resin: dimensionally stable, quiet, and mid-weight, with less thermal tolerance than ceramic.

Fireclay sits at the heavy, rigid end. A fired body cannot flex, its non-porous glazed surface is fused with the body in the same firing, and its mass gives an apron sink its planted, solid feel — at the cost of the ~2% fired tolerance and the support structure discussed above. The weight comparison below decides cartons, pallets and cabinet framing.

For a distributor, the honest summary: stainless wins on dimensional precision and weight, composite on quiet and colour range, fireclay on surface durability, heat tolerance and the apron-front architecture itself. The sizes are similar; the logistics are not.

What is the most common farmhouse sink size? The 33-inch nominal class carries the most volume in the North American market and is the widest class in our catalogue — nine of twenty-one models are drawn to the 838 x 510 mm fired target, in single, double and workstation formats.

What size cabinet do I need for a 33-inch farmhouse sink? For a dedicated farmhouse base, 33 to 36 inches with the opening matched to the sink's exact outer width. For a retrofit of a standard base, 36 inches — the roughly three-inch gap preserves the face frame stiles. The minimum base cabinet is published on each product page.

Why does my 36-inch sink measure 35.75 inches? Because the label is a nominal class and the fired target is 908 mm, which lands at 35.75 inches at the rim. The millimetre figure is the engineering target; the inch figure is the marketing class.

How accurate are the published sink dimensions? Our drawings state exact millimetre targets — 838 x 510 x 254 mm for the 33-inch class — and fired ceramic carries variation of around two per cent. Order against the drawing, take delivery against the tolerance, and template the worktop from the physical sink.

How deep is a farmhouse sink? Fired bowls in our range run from 8.74 to 10 inches (222 to 254 mm of body depth). Apron-front bodies cluster at 9.88 to 10 inches; the inset CD-series runs shallower at 222 to 225 mm to preserve under-sink storage.

How much does a fireclay farmhouse sink weigh? Between 35.65 kg (about 79 lb) for the 24-inch model and 53.95 kg (about 119 lb) for the largest 33-inch double bowl workstation. Plan the cabinet's internal cradle for the dry weight and the installation sequencing for the filled weight.

What is the standard kitchen sink drain size? A 3.5-inch (about 89 mm) opening is the North American standard, and every model in this catalogue is tooled to it — one strainer and trap specification covers the range.

Do farmhouse sinks come with faucet holes? Fireclay apron-front bodies are cast without a deck, so there are no faucet holes to drill — the faucet mounts through the worktop or the wall. Confirm the drawing before ordering, and plan any dispenser openings with the fabricator.

What sizes do workstation sinks come in? Twelve of our twenty-one models are workstation bodies with the integrated accessory ledge, spanning the 24-inch to 36-inch classes in single and double bowl formats. Accessory racks are dimensioned per model, not shared across sizes.

Can one product cover two cabinet sizes? Yes — several of our series are drawn at two nominal widths sharing one bowl architecture: the S2014E-Series at 33 and 36 inches, and the S2025, S2025K, S2025U, S12183-Series and S12183-TwoTone at 30 and 33 inches. One catalogue line, two cabinet classes.

Should the countertop be templated before the sink arrives? No. Template from the delivered sink — a fabricator cuts to the physical piece with its fired tolerance, never to the nominal class. This habit prevents the most expensive installation failure in the category.

What should I confirm with a supplier before ordering by size? Four things: the dimensioned drawing with the fired target and stated tolerance, the net weight for carton and cabinet planning, the drain and accessory standards, and the certifications listed for your destination market — cUPC, CE, UKCA and WaterMark marking are available across this range, with certificate file numbers on request.