Building materials · Reference
A standard kitchen sink is 30-33 in (762-838 mm) wide and about 22 in (559 mm) front-to-back, with bowls 8-10 in (203-254 mm) deep. A 33 in sink needs a 36 in base cabinet.
Kitchen sinks are specified by width × front-to-back × bowl depth; the base cabinet must be about 3 in (76 mm) wider than the sink.
| Sink type | Common width | Min. base cabinet | Bowl depth |
|---|---|---|---|
| Bar / prep sink | 15-18 in (381-457 mm) | 18-21 in (457-533 mm) | 5.5-8 in (140-203 mm) |
| Single-bowl (compact) | 22-24 in (559-610 mm) | 27 in (686 mm) | 8-10 in (203-254 mm) |
| Single / double (standard) | 30-33 in (762-838 mm) | 33-36 in (838-914 mm) | 8-10 in (203-254 mm) |
| Double-bowl (large) | 36 in (914 mm) | 39 in (991 mm) | 9-10 in (229-254 mm) |
Source: World Coppersmith — Choosing the Right Sink Size for Your Cabinet
| Measurement | Value |
|---|---|
| Overall size (L × W × D) | 30 × 18 × 10-1/2 in (762 × 457 × 267 mm) |
| Bowl size (L × W × D) | 28 × 16 × 10 in (711 × 406 × 254 mm) |
| Minimum base cabinet | 33 in (838 mm) |
| Mount type | Undermount |
Source: Kraus USA — KHU100-30 30 in single-bowl sink (2026)
| Measurement | Value |
|---|---|
| Nominal size (W × front-to-back) | 33 × 22 in (838 × 559 mm) |
| Drop-in cutout | 32-1/2 × 21-1/2 in (826 × 546 mm), 1/2 in (13 mm) radius |
| Minimum base cabinet | 36 in (914 mm) |
| Mount type | Top-mount (drop-in) |
Source: Kohler — Toccata K-3347L-3 spec sheet (2026)
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The most common sizes are a 30-33 in (762-838 mm) wide single bowl and a 33 in (838 mm) double bowl, both about 22 in (559 mm) front to back and 8-10 in (203-254 mm) deep.
A 33 in sink needs at least a 36 in (914 mm) base cabinet, per manufacturers like Kohler. The general rule is a cabinet about 2-3 in wider than the sink to clear the mounting hardware and cabinet walls.
A 30 in base cabinet fits a sink up to about 27-28 in wide. For a 30 in sink you need a 33 in cabinet, and for a 33 in sink a 36 in cabinet.
Standard kitchen sink bowls are 8-10 in (203-254 mm) deep. An 8 in bowl is easier to reach into; a 10 in bowl fits large pots and vases but can be a stretch for shorter users.
A drop-in (top-mount) sink needs a cutout slightly smaller than the sink so its rim rests on the counter (e.g., 32-1/2 × 21-1/2 in for a 33 in sink). An undermount mounts below the counter with the cutout matching the bowl opening.
Every figure on this page is traced to a named source, linked under each table. Standard sizes come from published standards and established industry references; where a size is a typical range or varies by manufacturer, we say so. Sizes vary by region, model and revision — treat these as the standard reference, and confirm the exact spec of the item you are selling.
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