A UK super king size bed measures 180cm wide by 200cm long, which is approximately 6ft by 6ft 6in. The mattress covers 3.6 square metres, making it the largest standard bed size sold in Britain. A super king frame, once headboard and side rails are included, typically occupies around 190cm to 200cm of width and 210cm to 220cm of length.
Against a king at 150cm by 200cm, a super king is 30cm wider with identical length. Against a double at 135cm by 190cm it is 45cm wider and 10cm longer. Each person sharing a super king gets 90cm of width, which is the same as a full single bed.
That 90cm per person is the number worth holding on to. It means two adults sleeping in a super king each have as much lateral space as they would in their own single bed. Movement transfers barely at all, and there is no negotiation over duvet coverage.
The length stays at 200cm, the same as a king. If you are tall and looking for more length rather than width, a super king does not help; you would need a longer continental or made to measure mattress instead. Super king is a width upgrade only.
Bedding at this size is generous. A super king duvet measures around 260cm by 220cm, and the extra drop on each side is what stops a wide bed looking under dressed. Some people prefer to use two single duvets side by side on a super king, which works well when two sleepers prefer different warmth levels.
This is where super king beds get decided. Take the frame at around 195cm wide, then add walking space. Sixty centimetres on each side is the minimum for comfortable access, and 70cm is better if bedside cabinets sit in that space. That puts the practical room width at 3.2m to 3.4m.
Length is easier. A super king frame at 215cm plus 60cm at the foot needs about 2.8m, and most rooms that are wide enough are also long enough.
Mark it out before you buy. Masking tape at 195cm by 215cm on the bedroom floor shows you the reality faster than any calculation. Walk to the wardrobe, open the door, pull out a drawer. If those actions feel cramped inside the tape outline, the bed is too large for the room.
Large main bedrooms in detached and semi detached houses are the natural home for this size. So are converted lofts with a generous floor plate, provided the ceiling height at the bed position allows sitting up comfortably. Barn conversions and older properties with big rooms suit it too, because the scale of the bed matches the scale of the space.
Practically, a super king earns its keep in specific situations: couples where one person moves a great deal during the night, households where children join the bed in the mornings, homes with a dog that sleeps on the bed, and anyone who has found a king still leaves them feeling constrained.
It also changes how a large room reads. A big bedroom with a king in it can look underfurnished, with too much empty floor around the bed. A super king fills the room properly and gives the space a proper centre.
Standard British bedrooms in newer housing stock are often around 3m wide, and that is not quite enough for a super king with proper access on both sides. Forcing it in means one walkway shrinks to shuffling width or one bedside cabinet has to go.
Rooms with a chimney breast, bay window or awkward door position lose usable width, and a super king has no flexibility to work around obstacles. Sloped ceilings are another constraint: the bed is wide enough that one side may sit under a low slope, which makes sitting up on that side uncomfortable.
Delivery access is a real limit too. A super king mattress is large and heavy, and while rolled and vacuum packed mattresses solve much of the problem, sprung super king mattresses are genuinely difficult to carry up a turning staircase. Measure the narrowest point of the route before ordering.
At this width, frame proportions matter. A super king with a shallow headboard can look oddly wide and flat, because the horizontal is so dominant. A taller headboard, whether upholstered or panelled timber, balances the width and gives the bed a vertical anchor.
Upholstered frames suit super king particularly well, since the fabric softens what is a very large object in the room. Our super king size fabric beds UK sale range includes deep buttoned and plain panel headboards, and the taller designs tend to sit better at this scale.
Timber works too, particularly in rooms with high ceilings where a substantial frame does not overwhelm. The super king size wooden beds UK options include slatted and solid panel designs, and a low timber platform reads calmer in a minimal room than a full upholstered frame would.
A super king takes 3.9 square metres of floor once the frame is counted, and in most bedrooms that means giving up a piece of storage furniture. Ottoman lift bases become the obvious answer, since they turn the volume under the mattress into usable space without adding footprint.
At super king width, ottoman bases are usually side opening rather than foot opening, because lifting a 180cm wide platform from the end requires clearance most rooms do not have. Check which mechanism a frame uses and confirm that the opening side has space to clear.
Bedside furniture needs to stay slim. Cabinets around 40cm wide keep the walkway usable, and wall mounted alternatives free the floor entirely. If wardrobe capacity is short after the bed goes in, look at the 6 doors wardrobe UK sale range for rooms with a long available wall, since going wide rather than deep protects the floor space around the bed.
Weight distribution changes on a very wide mattress. Pocket sprung constructions handle two people of different weights better than a single foam core, because the springs work independently and the dip on one side does not pull the other across.
Zoned support is worth looking for. A mattress with firmer support through the lumbar region and softer response at the shoulders suits side sleepers, and on a super king there is enough width that each sleeper genuinely stays in their own zone.
Consider the depth as well. Deep mattresses raise the surface height, which changes how the headboard reads and how easy the bed is to get into. On a low timber platform frame, a very deep mattress can leave the frame looking like a plinth rather than a bed.
You can compare super king frames, mattresses and storage across the full range at Furniture in Fashion, with free delivery to most UK mainland postcodes and returns available up to 30 days.
A super king measures 180cm by 200cm, which is approximately 6ft wide by 6ft 6in long.
No. Both are 200cm long. The super king is 30cm wider at 180cm against the king’s 150cm, but the length is identical.
Around 3.2m to 3.4m of width allows the frame plus comfortable access on both sides. Length is rarely the limiting factor, with about 2.8m being sufficient.
Yes, and many people prefer it. Two single duvets on a super king let each sleeper choose their own warmth level and remove any tug of war over the cover.
Rolled and vacuum packed mattresses usually will. Traditional sprung super king mattresses are large and rigid, so measure the narrowest point of your staircase and any turn before ordering.
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