120 cm Kitchen Sink Guide: Dimensions and Layouts

A 120 cm kitchen sink gives you 47.2 inches of dedicated wash space, making it one of the largest formats built for residential countertops. You should only buy one if your base cabinet measures at least 120 cm wide and you have ample continuous run length to spare.

Key takeaways

• Requires a base cabinet of at least 120 cm (or 48 inches) to properly clear the mounting hardware and bowl drops.
• Standard front-to-back outer depth is 50 cm, leaving a safe 5 cm border on standard 60 cm countertops.
• The most common layout features two equal basins paired with an integrated drying board.
• The trade-off is lost counter real estate: it claims nearly 4 feet of prep surface in a single run.

What are the exact dimensions of a 120 cm sink?

A 120 cm sink measures 1200 mm across the outer rim. Most designs measure 500 mm deep from front to back, which fits standard 600 mm kitchen countertops with clean clearance for backsplashes.

Internal bowl depths typically range from 180 mm to 220 mm. Sinks shallower than 180 mm splash water back onto the counter, while basins deeper than 220 mm cause lower back strain during long dishwashing sessions.

Standard drain holes on modern 120 cm sinks are 3.5 inches (90 mm) in diameter. This standard diameter ensures complete compatibility with waste kits, basket strainers, and garbage disposals.

Which layout fits your workflow?

A sink of this width comes in three primary layouts. Each one changes how you split your prep and cleaning duties.

The double bowl with a drainboard takes up the standard split: two 340 mm bowls side by side, leaving roughly 450 mm for the grooved metal or composite drain surface. If you do not own an automatic dishwasher, this configuration solves wet counter puddles instantly.

A single 120 cm trough bowl is rarer and acts like a commercial prep station. It lets you soak multiple full-sized sheet pans flat on the bottom without tilting. The catch is water volume: filling a massive single basin wastes dozens of liters if you only need to rinse a coffee mug.

What base cabinet and cutout do you need?

You cannot retrofit a 120 cm sink into a standard 90 cm base cabinet. The underside of the unit requires a full 120 cm open cabinet bay, or a custom modification that carves out adjacent cabinet sidewalls.

For drop-in (top-mount) installations, the worktop cutout is smaller than the outer rim. A typical drop-in model needs a cutout roughly 1180 mm wide by 480 mm deep, providing a 10 mm lip on every side to grip the worktop.

For undermount models, the cutout must match the interior bowl profiles precisely. Undermount installations require solid stone, quartz, or compact laminate. Never install an undermount 120 cm sink in a standard chipboard laminate counter, as any water seepage past the seal will rot the core rapidly.

Stainless steel or granite composite?

Stainless steel remains the benchmark for this size. Look for 304-grade steel with a thickness of at least 1.0 mm (19 to 18 gauge). Cheaper 0.6 mm steel will bow and drum loudly under the impact of running tap water across a frame this wide. Good steel versions feature welded corners and heavy sound-deadening pads glued to the underside of each basin.

Granite composite gives you a quiet, rigid sink that resists scratches and hot pan burns up to 280 degrees Celsius. The downside is raw weight: a 120 cm composite sink can weigh over 20 kg dry. Add water, and the cabinet framing must support upwards of 50 kg without flexing.

Who should buy a 120 cm sink, and who should skip it?

Buy this sink if your kitchen features an unbroken counter run of at least 3.5 meters, or if you regularly cook with stockpots, Dutch ovens, and large roasting pans. It also fits outdoor kitchens and garage wash bays where dirty garden tools and grill grates need wide-open washing room.

Skip this sink if your kitchen is small or U-shaped with tight corners. Committing 1.2 meters of counter solely to water duties creates a major prep bottleneck. If you need counter space more than wash volume, buy an 80 cm sink instead and keep the extra 40 cm for cutting boards, appliances, and food staging.

Photo by taufiq triadi on Unsplash