A standard UK king size bed measures 150cm wide by 200cm long, which works out at roughly 5ft by 6ft 6in. That is the mattress size, so the bed frame itself will usually sit somewhere between 155cm and 170cm wide depending on how thick the side rails are and whether the headboard is upholstered or slim panelled.
Those two numbers matter for different reasons. The 150cm width gives each sleeper 75cm of personal space, which is noticeably more generous than a double. The 200cm length is the part people often overlook, because it is 10cm longer than a standard double and makes a real difference for anyone approaching six feet tall.
UK bed sizing follows its own conventions, and it helps to see the king in context rather than in isolation. A single is 90cm by 190cm. A small double, sometimes called a three quarter bed, is 120cm by 190cm. A standard double is 135cm by 190cm. The king steps up to 150cm by 200cm, and a super king takes it further again at 180cm by 200cm.
The jump from a double to a king is only 15cm in width, which sounds modest written down. In practice it is the difference between two adults sleeping shoulder to shoulder and two adults each having room to turn over without disturbing the other. Combined with the extra 10cm of length, it is one of the more worthwhile upgrades in a bedroom.
This is where a lot of UK bedrooms run into trouble. The bed will physically fit into most main bedrooms, but fitting and functioning are two different things. As a working guide, allow at least 60cm of clear floor space along each side you need to walk down, and a similar amount at the foot of the bed if you want to pass across it comfortably.
That means a king positioned centrally against one wall really wants a room around 300cm wide as a minimum. If your room is closer to 270cm, you can still make it work by pushing the bed against one side wall and accepting single sided access, though that only suits certain layouts. Measure the room before you commit, and take note of where the door swings, where radiators sit, and how far wardrobe doors project when open.
It is also worth measuring the route into the room. Stairwells with tight turns, narrow landings, and low ceilings on the first floor cause more delivery problems than the bedroom itself. Most king frames arrive flat packed in sections, which helps considerably, but slatted bases and one piece headboards can still be awkward. If you are shopping across our range of modern king size beds UK sale then check the packaged dimensions against your tightest corner rather than the assembled size.
Two king beds with identical mattress sizes can occupy very different amounts of floor. Upholstered fabric frames tend to have the deepest side rails and the most substantial headboards, sometimes adding 20cm to the overall width and 15cm to the length. They look softer and warmer, and they suit rooms with plenty of space to absorb the extra bulk.
Wooden frames vary widely. A slim Scandinavian style frame in oak may add only 8cm to each dimension, while a chunky rustic design with turned legs and a solid footboard will take up considerably more. Our selection of modern wooden beds UK covers both ends of that range, so it is worth comparing the stated frame width rather than assuming they are all the same.
Metal frames are usually the most economical on space. The tubular construction means the rails sit close to the mattress edge, and open headboards keep the visual weight low, which helps in smaller rooms where a solid headboard can feel dominating.
King bedding is sized to suit the 150cm by 200cm mattress, with a typical king duvet measuring around 225cm by 220cm. That generous drop is intentional, because a duvet that only just covers the mattress will end up being pulled from side to side during the night.
Fitted sheets need to account for mattress depth as well as width and length. Deeper pocket sprung and memory foam mattresses can reach 30cm or more, and a standard depth fitted sheet will keep coming loose at the corners. Check the depth measurement on the sheet packaging rather than assuming king size covers it.
Pillows are the one area where UK sizing stays consistent across bed sizes. Standard UK pillows are 50cm by 75cm, and two of them sit neatly across a king headboard with a little space at each end. If you want the fuller look you often see in photographs, add two square continental pillows behind the standard pair.
A larger bed leaves less room for everything else, so the storage furniture around it has to work harder. Slim bedside cabinets are the obvious starting point, and anything around 40cm to 45cm wide will sit comfortably beside a king without crowding the walkway. Look at our modern bedside cabinets UK sale for narrower options that still offer a drawer and a shelf.
Under bed storage is the other route worth considering. Ottoman king beds lift on gas struts to reveal the full footprint of the base, which is a considerable amount of space for spare bedding and seasonal clothing. Drawer bases give you less volume but are easier to open in a room where the ceiling is low or a light fitting hangs close to the bed.
If wardrobe space is the pressure point, a taller narrower wardrobe often serves a king bedroom better than a wide one. Browsing our modern wardrobes UK sale with your remaining wall width in mind will make the shortlist much shorter and the decision much easier.
Larger mattresses can behave differently to smaller ones. A king mattress needs proper central support in the base, because the wider span will sag over time if the slats only run to the outer rails. Most quality king bases include a central rail with legs, and it is worth confirming this rather than assuming.
Weight is another practical factor. A pocket sprung king mattress can be heavy enough to make routine turning a two person job. If you live alone or would rather not wrestle with it every few months, look for a mattress that only needs rotating head to foot rather than flipping over completely.
Firmness preferences also become more visible on a king. Because there is more space between sleepers, dual tension mattresses become a genuine option, allowing a different feel on each side without either person noticing a ridge down the middle.
A king suits couples who want undisturbed sleep, taller sleepers who find a double too short, and anyone who shares the bed with children in the early morning or a dog at the foot. It also photographs well and gives a main bedroom a settled, considered feel that a smaller bed in a large room never quite achieves.
It is less suitable in rooms under 270cm wide, in loft conversions with sloping ceilings that cut into one side, and in guest rooms that also need to function as a study or dressing area. In those cases a double or small double will usually give you a better overall room.
At Furniture in Fashion we stock beds across every UK size, and we find customers make better decisions once they have measured the room and pictured the walkways rather than working from the mattress dimensions alone. You can browse the full modern bedroom furniture UK sale range to see how frames, cabinets and wardrobes work together at each size, and we offer free delivery to most UK mainland postcodes.
No. A US king is wider at around 193cm and slightly shorter at 203cm. UK king bedding will not fit a US king mattress properly, so check the origin of any bedding bought from overseas sellers.
Around 300cm by 340cm gives comfortable access on both sides and at the foot. You can go smaller with single sided access, but the room will feel tight.
You need a base with central support running from head to foot. Without it the mattress will dip in the middle over time regardless of its quality.
Almost all modern king frames arrive in flat packed sections, including the side rails, headboard and slat packs. Check the packaged carton sizes if your stairs or landing are narrow.
Two standard UK pillows sit across a king with room to spare, or four if you layer square continental pillows behind the sleeping pair.
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