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Kitchen island sizes in the US and the UK compared
As checked on 20 October 2026, a kitchen island with seats on one side is about 40½ inches (103 cm) deep. Each seat needs 24 inches (61 cm) of length. No rule sets one island size, so the depths below are sums of standard parts: the base cabinet, the worktop edge and the knee space.
| Island size | US | UK |
|---|---|---|
| Depth, work island with no seats | About 27 in (69 cm): a 24 in cabinet and a 1½ in edge each side | 620–720 mm worktops (DIY Kitchens sizes) |
| Depth, seats on one side at a 36 in counter | About 40½ in (103 cm) | About 900 mm (35 in): a 600 mm worktop and a 300 mm bar |
| Depth, cabinets back to back | About 51 in (130 cm) | No figure in our sources |
| Length for each seat | 24 in (61 cm) | 500–600 mm (20–24 in) |
| Length for two seats | 48 in (122 cm) | 1,000–1,200 mm (39–47 in) |
| Hob on the island | The hob plus 27 in (69 cm) beside it, and 9 in (23 cm) of top behind | No figure in our sources |
| Sink on the island | The sink plus 42 in (107 cm) beside it | No figure in our sources |
| Floor around the island | 42 in (107 cm) to cabinets, 36 in (91 cm) to a wall | 120 cm (47 in) to other units |
Source: KraftMaid cabinet sizes and island guide; Caesarstone overhang guide; US National Kitchen & Bath Association (NKBA) Planning Guidelines 6, 9, 11 and 17; DIY Kitchens advice pages; IKEA ENHET installation guide. Depths and lengths are our sums of these figures. Checked October 2026.
Depth is the short side, front to back. Length is the long side, where the stools go. Read the table from the top: pick the depth for how you will use the island, then add length for seats, a hob or a sink. The free floor around it is in our guide to the space around a kitchen island. Every other kitchen measurement is in our kitchen dimensions guides.
An island with seats is about 40½ inches deep
An island with seats on one side is about 40½ inches (103 cm) deep. It is three parts added together:
- Base cabinet: 24 in (61 cm) deep, the standard box depth before doors, says KraftMaid, a US cabinet maker.
- Edge on the work side: 1½ in (38 mm), the standard quartz overhang, says Caesarstone.
- Knee space for seats: 15 in (38 cm) at a 36 inch (91 cm) counter, from guideline 9 of the US National Kitchen & Bath Association (NKBA).
Change the parts and the depth changes. With no seats, the island is about 27 inches (69 cm): one cabinet with a 1½ inch edge each side. At a 42 inch (107 cm) bar, NKBA asks for only 12 inches (30 cm) of knee space, so that part of the top can be shallower. Cabinets back to back, with storage on both sides, make about 51 inches (130 cm).
In the UK, DIY Kitchens uses a 600 mm worktop and a 300 mm (12 in) breakfast bar overhang. Together that is about 900 mm (35 in). It sells island worktops 900 and 940 mm deep. Both the overhang and the cabinet depths are explained in our guides to countertop overhang and standard kitchen cabinet sizes.
Each seat adds 24 inches to the island length
An island needs 24 inches (61 cm) of length for every seat, says NKBA guideline 9. That is the width of the knee space for one person. So the number of seats sets the shortest island:
- Two seats: 48 in (122 cm).
- Three seats: 72 in (183 cm).
- Four seats: 96 in (244 cm).
In the UK, DIY Kitchens allows 500 to 600 mm (20–24 in) for each seat. So two stools need an island 1,000 to 1,200 mm (39–47 in) long.
Seats also need the right height. A standard counter is 36 inches (91 cm) high, a 34½ inch cabinet with a 1½ inch top. Our guide to counter height vs bar height compares counter and bar seats.
A long island needs a long worktop. DIY Kitchens sells laminate tops up to 4,000 mm long and solid wood up to 3,000 mm, so a longer island may need a joint.
A hob or sink on the island makes it longer
A hob or sink on the island needs worktop on each side, so it makes the island longer. NKBA sets this free worktop, called the landing area, in two guidelines.
- Hob: 12 in (30 cm) on one side and 15 in (38 cm) on the other, so 27 in (69 cm) plus the hob. Guideline 17 also asks for at least 9 in (23 cm) of worktop behind it, at the same height.
- Sink: 24 in (61 cm) on one side and 18 in (46 cm) on the other, so 42 in (107 cm) plus the sink, from guideline 11.
Add the seat length on top of this. Keep stools away from the hob side, because the worktop behind the hob is there to keep pans away from people.
An island with only a top and storage stays the most flexible. It can be shorter, and it needs no water or power run under the floor.
The room around the island sets its largest size
The room sets the largest island you can have, because the floor around it comes first. KraftMaid asks for at least 42 inches (107 cm) between the island and the cabinets, and 36 inches (91 cm) to any wall. NKBA asks for 48 inches (122 cm) where two people cook, and 44 inches (112 cm) behind stools that people walk past. IKEA recommends 120 cm (47 in) between its islands and the other kitchen units.
Here is our example of a 12 by 12 foot room (366 by 366 cm) with cabinets on one wall:
- The room is 144 in wide. Take away the 25½ in wall worktop, a 42 in aisle and a 36 in walkway behind the stools. That leaves 40½ in: just enough for one island with seats, and people can only edge past the stools.
- 144 in of length, minus a 36 in walkway at each end, leaves 72 in: room for three seats.
- In a 10 by 10 foot room, the same sum leaves 16½ in. That is less than one base cabinet, so no island fits.
Check your own room with the kitchen island size calculator. If no island fits, compare a peninsula in our guide to choosing a kitchen layout.
How to size a kitchen island in six steps
Start with what the island is for, then check that the room can take it.
- Decide what the island holds: storage only, seats, a hob or a sink.
- Set the depth: about 27 in (69 cm) with no seats, 40½ in (103 cm) with seats on one side, or 900 mm in the UK.
- Add 24 in (61 cm) of length for each seat, or 500 to 600 mm in the UK.
- Add the landing areas: 27 in (69 cm) plus the hob, or 42 in (107 cm) plus the sink.
- Measure the room and take away the cabinets and the floor you need on each side: 42 in (107 cm) to cabinets, 36 in (91 cm) to a wall.
- Check that the island from steps 2 to 4 fits inside what is left. If not, drop a seat or move the hob or sink.
Then tape the outline on the floor and walk around it, with the dishwasher and oven doors open.
Check your islandEnter your room and island, and see the space left on each side.
Open the island size calculator →Common problems with kitchen island size, and how to fix them
Most island size problems come from three things. The island is too shallow for knees, too short for its seats, or too big for the floor around it.
| What you see | Why it happens | What to do |
|---|---|---|
| Knees hit the cabinets | The island is too shallow for the seats | Plan 15 in (38 cm) of knee space at a 36 in counter |
| Stools bump into each other | Less than 24 in (61 cm) of length for each seat | Drop a seat, or lengthen the island |
| No room to put pans down by the hob | The hob sits too near the end of the island | Keep 12 in (30 cm) on one side and 15 in (38 cm) on the other |
| The aisle feels tight when you cook | The island takes the floor the aisle needs | Keep 42 in (107 cm) to the cabinets, 48 in (122 cm) for two cooks |
| The island top has a joint in it | It is longer than the longest worktop piece | Check the maximum length of your worktop before you plan |
| No island fits at all | Cabinets and aisles use the whole width | Try a peninsula or a table |
Source: NKBA Kitchen Planning Guidelines 6, 9 and 17; KraftMaid island guide; DIY Kitchens advice pages. Checked October 2026.
When you order the top, include every overhang in its size. Our guide to measuring kitchen countertops shows how, and the countertop area calculator adds up the total.
New guides in this series appear in all our kitchen planning guides.
Quick questions
- What are the standard dimensions of a kitchen island?
Not one size: no rule sets it. With 24 inch (61 cm) base cabinets and seats on one side, an island is about 40½ inches (103 cm) deep. Allow 24 inches (61 cm) of length for each seat.
- Can a kitchen island be 24 inches wide?
Not with seats. A 24 inch (61 cm) base cabinet with a 1½ inch edge each side makes a work island about 27 inches deep. Seats at a 36 inch counter need 15 more inches (38 cm) of knee space.
- Is a 6 or 7 foot island too small?
No. A 6 foot (72 inch, 183 cm) island seats three people at 24 inches (61 cm) each. A 7 foot (84 inch, 213 cm) one seats three with 12 inches to spare. Both still need 42 inches (107 cm) of floor to the cabinets.
- Is a 10 ft island too big?
Not if the room is long enough. A 10 foot (120 inch) island seats five. With a 36 inch (91 cm) walkway at each end, it needs a room at least 16 feet (4.9 m) long.
- Can I fit an island in a 12x12 kitchen?
Only just, with cabinets on one wall. A 25½ inch worktop, a 42 inch aisle and a 36 inch walkway leave 40½ inches of the 144. That fits a seated island about 72 inches long.
- Can you fit an island in a 10x10 kitchen?
No, not with these gaps. A 25½ inch worktop, a 42 inch aisle and a 36 inch walkway leave 16½ inches of the 120, less than one base cabinet. A peninsula may fit instead.
How we check
We take every clearance from published planning guidelines and manufacturer guides, and record the page and the date we checked it. Our examples are drawn to scale from the dimensions they state. They are planning examples, not approvals for installation: services, fixings and local rules need your designer or installer. Our editorial policy.
Sources7 published guidelines and guides behind this page
Numbered in order of first use.
- Kitchen Planning Guidelines: guideline 6 (work aisle at least 42 in for one cook, 48 in for multiple cooks), 7 (walkway at least 36 in), 8 (44 in behind seats to walk past), 9 (24 in wide knee space per diner; 18 in deep at 30 in, 15 in at 36 in, 12 in at 42 in counters), 11 (sink landing areas 24 in and 18 in) and 17 (cooking surface landing areas 12 in and 15 in; on an island or peninsula the countertop extends at least 9 in behind the cooking surface), National Kitchen & Bath Association (NKBA). Checked 20 October 2026.
- What are standard kitchen cabinet sizes? Standard base cabinet depth 24 in; base cabinet 34-1/2 in high, 36 in with a 1-1/2 in countertop, KraftMaid. Checked 20 October 2026.
- How to design a kitchen island: a minimum of 42 in of aisle space between the island and perimeter cabinets, and 36 in between the island and any wall, KraftMaid. Checked 20 October 2026.
- Quartz countertop overhang: how far can you go? The standard quartz countertop overhang is 1½ in, Caesarstone. Checked 20 October 2026.
- Breakfast bar inspiration: 300 mm breakfast bar overhang; about 20 mm on the other sides; 500–600 mm per seat, 1,000–1,200 mm for two seats; no set island depth; island worktops: solid wood up to 3,000 mm long, 620, 720, 900 or 960 mm deep; laminate up to 4,000 mm long, island tops 670 and 900 mm (Quadra) or 640, 680 and 940 mm (square edged), DIY Kitchens. Checked 20 October 2026.
- How much worktop overhang should I have? Standard laminate worktops 600 mm deep over 560 mm deep base units with 20 mm doors, DIY Kitchens. Checked 20 October 2026.
- ENHET installation guide, printed page 14, building a kitchen island: leave 120 cm between the island and the other kitchen units, IKEA. Checked 20 October 2026.
The cabinet depth, overhang, seat and landing figures come from maker guides and the NKBA planning guidelines, checked on 20 October 2026. The island depths, lengths and room examples are our own sums of those figures, and inch-to-centimetre conversions are ours, rounded. They are planning references, not a check of your room, your worktop or local building rules.