Dimensions / Building materials / Kitchen sinks / Double-bowl sink
A double-bowl kitchen sink has two bowls, each with its own drain. The US doubles found run 30 to 35-1/2 in wide, and the stainless and composite 32 to 33 in ones all need a 36 in cabinet (Kraus, Kohler, Ruvati, Blanco); Ruvati’s 30 in doubles and Kohler’s cast-iron 33 in Brookfield take 33 in. "50/50" means two equal bowls, 13-1/2 in each in a 30 in sink and up to 15-1/2 in in a 33 in one; "60/40" is a label, printed as 18 + 12 or 18 + 11 in at 32 in; "70/30" appears only on Ruvati’s RVM5300, 18-1/2 + 10 in. The bowls can differ in depth, 10 and 8 in on Kraus KHU123-32, and low-divide models drop the middle wall to about 6 in.
| Kraus KHT302-33 | Each bowl | Minimum cabinet |
|---|---|---|
| 33 × 22in | 15-1/2 × 18in | 36in |
Sources: Kraus. Checked October 2026.
Kraus’s 32 in KHU123-32 in a 36 in cabinet, a 25-1/2 in counter at 34 in high are filled in; pick another model or change the cabinet, the counter or the rule.
Cabinet minimums are each maker’s printed figure for that model, counter room is installer guidance, and the accessibility rules are the US ones. Sizes in inches.
Kraus KHU123-32 prints a minimum base cabinet of 36 in (914 mm) for this 32 in sink; your cabinet is 36 in.
Ruvati’s 30 in doubles take a 33 in cabinet; Kohler’s 35-1/2 in double still takes 36 in.
Ruvati says most installers want 1-1/2 to 3 in of counter in front of an undermount sink and 3 to 5 in behind, so a sink 20 in front to back needs a counter at least 24-1/2 in (622 mm) deep; yours is 25-1/2 in, 1 in to spare.
Kraus KHU123-32 is 20 in front to back and prints a 21 in front-to-back cabinet minimum.
ADA 2010, 606.3, puts the front of the rim or counter at no more than 34 in (865 mm) above the floor; yours is 34 in. The 2010 Standards set no limit on bowl depth.
UFAS: only one bowl of a double has to be 6-1/2 in deep or less.
Selling double-bowl sinks? Photograph the sink from above, mark overall size, each bowl’s width and depth, the divide height and both drains in SizeMarker, and send the picture with your quote.
Mark a photo| Model | Sink | Bowls, left + right | Minimum cabinet |
|---|---|---|---|
| Ruvati RVH735050/50, undermount | 30 × 19 in | 13-1/2 + 13-1/2 in | 33 in |
| Kraus KHU102-3350/50, undermount | 32-3/4 × 19 in | 14-7/8 + 14-7/8 in | 36 in |
| Kraus KHT302-33This page | 33 × 22 in | 15-1/2 + 15-1/2 in | 36 in |
| Kraus KHU103-3260/40, undermount | 32 × 19 in | 18 + 12 in | 36 in |
| Kraus KHU123-3260/40, bowls 10 and 8 in deep | 32 × 20 in | 18 + 11 in | 36 in |
| Ruvati RVM530070/30, bowls 9 and 7 in deep | 31-1/2 × 17-3/4 in | 18-1/2 + 10 in | 36 in |
| Kohler Strive K-5284Large/medium, 32 in | — | 17-1/2 + 11-5/8 in | 36 in |
| Kohler Strive K-5282Extra-large/medium, 35-1/2 in | — | 20-3/4 + 11-5/8 in | 36 in |
| Kohler Brookfield K-5846-4Equal, cast iron, top-mount, 33 in | — | 14-3/16 + 14-5/16 in | 33 in (838 mm) |
| Blanco PERFORMA Equal DoubleUndermount | 33 × 20 in | 15 + 15 in | 36 in |
Sources: Ruvati · Kraus · Kraus · Kraus · Kraus · Ruvati · Kohler · Kohler · Kohler · Blanco
| Label | Bowls as printed |
|---|---|
| 50/50 or equalRuvati; Kraus; Blanco | Two bowls of the same width: 13-1/2 in in a 30 in sink, 14-1/2 to 15-1/2 in in 32 to 33 in sinks |
| 60/40Kraus; Ruvati | A label, not a ratio: 18 + 12 and 18 + 11 in at 32 in; 16-7/8 + 12-7/8 in on Kraus’s 32-3/4 in KHU103-33 |
| 70/30Ruvati | Printed only on the RVM5300: 18-1/2 + 10 in in a 31-1/2 in sink |
| KohlerKohler | No ratio: large/medium bowls of 17-1/2 + 11-5/8 in |
Sources: Ruvati · Kraus · Blanco · Kraus · Kraus · Ruvati · Ruvati · Kohler
| Item | Figure |
|---|---|
| Two drainsKraus | Rear centre-set drains, one in each bowl, with 3-1/2 in openings |
| Two depthsKraus; Ruvati; Blanco | The bowls can differ: 10 and 8 in (Kraus KHU123-32), 9 and 7 in (Ruvati RVM5300), 9.5 and 8 in (Blanco DIAMOND 1¾) |
| Low divideKraus | A lower middle wall for large pans: about 6 in high in Kraus KHT302-33’s 10 in deep bowls |
| CabinetMakers (our comparison) | Stainless and composite 32 to 33 in doubles here need 36 in; Ruvati’s 30 in doubles and Kohler’s cast-iron 33 in Brookfield 33 in; Kohler’s 35-1/2 in double still 36 in |
| Accessible2010 ADA 606.2; UFAS 4.34.6.5 | Only one bowl has to give knee clearance (ADA) or be 6-1/2 in deep or less (UFAS) |
Sources: Kraus · Kraus · Ruvati · Blanco · Kraus · Kohler · Ruvati · US Department of Justice · US Access Board
| Item | Figure |
|---|---|
| Counter roomRuvati FAQ | Most installers want 1.5 to 3 in in front of an undermount sink and 3 to 5 in behind it |
| Cabinet front to backKraus | 24 in for most Kraus doubles; 21 in for the KHU123-32 |
| Rim height2010 ADA 606.3 | 34 in (865 mm) at most; a home kitchen may use a sink adjustable from 29 to 36 in |
Sources: Ruvati · Kraus · Kraus · US Department of Justice
Usually 36 in: the stainless and composite 32 to 33 in doubles here all print 36 in (Kraus, Kohler, Ruvati, Blanco). Ruvati’s 30 in doubles take 33 in, and Kohler’s cast-iron Brookfield, 33 in wide, takes a 33 in cabinet.
A label for unequal bowls, not an exact ratio: Kraus’s 32 in 60/40 sinks have 18 + 12 or 18 + 11 in bowls, Ruvati’s 18 + 11 in; Kohler just says large/medium.
13-1/2 in in a 30 in sink (Ruvati RVH7350), 14-7/8 in in Kraus’s 32-3/4 in KHU102-33 and 15-1/2 in in its 33 in KHT302-33.
One with a lower wall between the bowls so big pans fit: Kraus’s KHT302-33 has a divider about 6 in high in 10 in deep bowls.
Yes: the 2010 ADA Standards need knee clearance under only one bowl, and UFAS needs only one bowl 6-1/2 in deep or less. None of the doubles found has a bowl under 7 in, though.
Not always: Kraus KHU123-32 is 10 and 8 in deep, Ruvati RVM5300 9 and 7 in.
A buyer of double-bowl sinks asks for the overall size, each bowl’s width and depth and the split, the divide height, both drain positions, the minimum cabinet, the mounting and cut-out, the gauge, and the carton size and weight. Mark those on a photo of your own sink with SizeMarker, like the picture at the top, and share one card in WhatsApp or WeChat.
