A king size bed in the UK is 150cm wide and 200cm long, which converts to 5ft by 6ft 6in. Each sleeper gets 75cm, the same width as a standard single mattress. The external frame usually measures between 158cm and 175cm wide once side rails or padded borders are included.
Those figures put the king 15cm wider and 10cm longer than a double. The length is what many people notice first, since 200cm is the point at which taller sleepers stop reaching the end of the mattress. This guide covers how a king behaves in a real bedroom rather than on a spec sheet.
The metric figures are 150cm by 200cm. In imperial that is 5ft by 6ft 6in. Duvets for a king are commonly 225cm by 220cm, giving a generous drop over both sides. Fitted sheets are made to 150cm by 200cm with a stated depth to match your mattress.
Overseas naming causes confusion here. A US king is around 193cm by 203cm, closer to a UK super king. A US queen at 152cm by 203cm is nearly the same width as a UK king but 3cm longer. If you buy bedding from an international seller, work from centimetres only.
The mattress footprint is 3 square metres. Once the frame is included, the bed occupies closer to 3.5 square metres, and once you add walkways it needs an area of about 7.8 square metres, or a room roughly 285cm by 275cm.
In a main bedroom of 340cm by 300cm, a king leaves comfortable walkways plus room for bedside cabinets and a chest of drawers. In a room of 280cm by 260cm it will fit but with tight access, and something has to give on storage. Marking the footprint with tape for a day or two answers this better than any calculation.
The 15cm of extra width sounds modest but changes how two people sleep. At 75cm each, you are not touching arms when both lying on your backs, and one person turning is far less disruptive. It is the difference between being aware of the other person and not.
The 10cm of extra length is the underrated part. Anyone from about 5ft 10in upward will feel it, particularly with a footboard in place. If you are deciding between a wider double and a longer king and height is a factor, length wins. Our king size wooden beds UK sale range covers a variety of footboard heights, including open ended designs.
A king bed is visually substantial, so frame height determines whether it anchors the room or dominates it. Low frames around 90cm at the headboard keep the wall visible and suit ceilings around 230cm to 240cm. Taller headboards from 110cm upward make the bed a clear focal point and need height above to breathe.
Colour affects the same impression. A frame in a tone close to the wall behind it recedes. A dark frame against a pale wall emphasises the full 150cm width. If your room is on the smaller side for a king, a paler upholstered frame in a low profile will sit more quietly. Browse our king size high gloss beds UK sale range to see how finish changes the effect.
A 150cm mattress needs central support. King bases should include a centre rail with at least one leg, and slats should be spaced around 7cm apart or less. Without that, the middle of the mattress will settle over time and you will feel a ridge or a dip.
Weight is a practical factor. A pocket sprung king mattress can exceed 40kg, which makes rotating it a two person task. Side handles help considerably. If regular rotation is unrealistic, a mattress designed as no turn with a single sleeping side is a sensible choice. Our mattresses UK sale listings state the base type and turning requirement for each model.
The main compromise with a king is storage. A 165cm external frame plus walkways can leave only one wall available, so decide early whether that wall holds a wardrobe or a chest of drawers. Trying to fit both is where rooms end up feeling crowded.
Storage bases recover capacity within the footprint you have already committed. An ottoman king gives an internal space around 145cm by 195cm at 25cm to 30cm deep, enough for suitcases and spare bedding. A drawer divan offers shallower but more accessible compartments. Either can remove the need for a chest, freeing the wall for hanging space. Our 3 door wardrobes UK sale suit rooms where the bed has taken the longer wall.
The longest component on a king frame is usually the 200cm side rail, and the pinch point in most UK homes is the turn at the top of the stairs rather than a doorway. Measure the diagonal clearance there and note the ceiling height above the turn, since low headroom is what stops a long rail pivoting.
Divan bases split into two 75cm halves, which handles almost any stairwell. Upholstered and wooden frames arrive flat and assemble in the room. Leave enough space in the room to build the frame before positioning it, since a fully assembled king is awkward to shift alone. You can shop modern furniture UK for beds and bedroom storage at Furniture in Fashion, and Returns are available up to 30 days.
Choose a king if two adults share the bed regularly and a double has started to feel restrictive, or if either sleeper is over about 5ft 10in. It suits most main bedrooms in UK homes built in the last few decades and many older ones with a clear run of wall.
Skip it if the room is under about 280cm across, if the only available wall is interrupted by a chimney breast or bay, or if you would have to give up the wardrobe you rely on. In those cases a good double with a well chosen mattress serves better than a king that makes the room hard to move around.
How big is a UK king size bed?
150cm wide by 200cm long, or 5ft by 6ft 6in. The external frame is generally 158cm to 175cm wide depending on the design.
How much bigger is a king than a double bed?
15cm wider and 10cm longer. Each sleeper gains 7.5cm of width, and the mattress reaches 200cm, which helps anyone over about 5ft 10in.
What room size fits a king size bed?
Roughly 285cm by 275cm allows for the frame plus a 60cm walkway on each side and at the foot. Measure the clear wall run rather than the overall room width.
Is a UK king size the same as a US king?
No. A US king is around 193cm by 203cm, closer to a UK super king. A US queen at 152cm by 203cm is nearer to a UK king in width.
Can I fit a wardrobe in the same room as a king bed?
Often yes, but usually on the shorter wall. Sliding door wardrobes need no swing clearance, which makes them easier to place in a room where the bed has taken the main wall.
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