What Is the Size of a Super King Size Bed?

A UK super king size bed measures 180cm wide by 200cm long, equivalent to 6ft by 6ft 6in. That is the mattress dimension. The frame will be larger, typically taking the total footprint to around 190cm by 210cm, and upholstered designs can add more.

It is the largest standard size sold in the UK. Anything wider, such as an emperor bed at 200cm or more, is a specialist size with limited bedding availability.

Super King Dimensions in Context

At 180cm wide, a super king gives each of two sleepers 90cm, the same width as a full single bed. That is the clearest way to understand what you are buying: two singles’ worth of width in one mattress, with the extra length that a king also provides.

Compared with a king at 150cm, a super king adds 30cm of width and no extra length. Compared with a double at 135cm, it adds 45cm of width and 10cm of length. The jump from king to super king is substantial and is felt most by couples where one person moves a lot in the night.

Duvets for a super king are usually 260cm by 220cm, and fitted sheets are made to 180cm by 200cm. Availability is good in the UK but narrower than for double and king, so factor that in if you like a particular bedding range.

Room Size and Access

A super king needs a genuinely large bedroom. As a practical minimum, allow a room of about 3.7m by 3.4m to keep 60cm of clear walking space on both long sides. In anything smaller, one side of the bed ends up against a wall, which makes bed making difficult and access awkward for whoever sleeps on that side.

You also need to think about what else the room contains. A super king leaves little wall length spare in a typical UK master bedroom, so wardrobe placement becomes the constraint. Fitted or sliding designs help, and our modern sliding wardrobes UK sale range avoids the door swing clearance that hinged wardrobes demand.

Access into the room is a real issue at this size. A 180cm mattress will not turn on many UK staircases, particularly in Victorian terraces with a tight quarter turn. Super king divan bases are supplied in two halves as standard. For mattresses, look for rolled or vacuum packed options where possible, which pass through doorways easily and expand once unpacked. Measure your narrowest point before ordering.

Frame Footprint and Design Choices

The gap between mattress size and real footprint widens at super king. A slim metal frame might add only 4cm per side. An upholstered frame with deep padded rails and a substantial headboard can add 12cm per side plus 15cm of headboard depth, which is nearly 30cm of extra width overall.

Storage designs behave differently again. An ottoman base lifts to reveal a full length storage void, which is genuinely useful at super king because the volume is large, but you need clearance in front of the bed for the lid to open. Side opening ottomans need clearance to one side instead. Drawer bases need drawer pull space.

Height is worth considering too. A tall divan base with a deep mattress can put the sleeping surface at 70cm or more, which suits some people and feels high to others. Low profile frames read better in rooms with modest ceiling heights.

We stock super king in every construction, including modern super king size leather beds UK and super king size wooden beds UK sale, with external frame dimensions listed alongside the mattress size on each product.

Support Requirements

A super king mattress is heavy, and support becomes a structural question rather than a detail. Any frame at this size needs a centre support rail running head to foot with at least two central legs, and better designs use three. Slats should be closely spaced, no more than 7cm apart, and sprung slats in two separate banks are preferable to a single long run because they flex independently for each sleeper.

Check the stated maximum load. A cheaply built frame at super king will show its weakness within a year or two, usually as a dip along the centre line. This is the one size where paying attention to frame construction genuinely pays.

Zip and Link Mattresses

At super king, zip and link becomes a sensible option. Two 90cm mattresses zip together to form one 180cm surface. The advantages are practical: each side can have a different firmness, the halves are easy to carry upstairs, and either can be replaced separately.

The compromise is the join. With a good quality pair and a proper zip, the seam is barely noticeable under a mattress topper. With mismatched or worn mattresses it becomes obvious. Buy them as a matched pair from the same range, and add a full width topper across both.

Standard super king mattresses avoid the seam entirely and are the simpler choice if access to the room allows. Both types are available in our mattresses UK sale selection.

Who Should Choose Super King

It suits couples where one or both sleep restlessly, households where children or a dog end up on the bed, and anyone who has found a king still feels close. It suits large master bedrooms in detached houses, converted loft rooms with a generous footprint, and homes where the bedroom is used purely for sleeping rather than doubling as a study.

It does not suit rooms under about 3.5m in either direction, homes with difficult stair access unless you use a two part base and rolled mattress, or bedrooms that need to hold a substantial amount of freestanding storage as well.

One further consideration: a super king dominates a room visually as well as physically. In a room with modest proportions, it can leave the space feeling like a bed with a bit of floor around it. A king with a proper armchair and comfortable circulation is often the better outcome. If you are weighing this up, the full range of sizes and layouts at Furniture in Fashion makes it easy to compare footprints side by side.

Finishing the Room

At super king, proportion matters. Bedside furniture should be substantial enough not to look lost beside a 180cm bed, so wider two drawer units usually read better than narrow single drawer tables. Our modern bedside cabinets UK sale range includes wider options suited to larger beds.

Lighting should be planned for two sleepers with independent switches, either wall mounted to save surface space or table lamps if the bedside units are deep enough. Rugs, if used, should extend well beyond the bed on both sides rather than sitting only at the foot, otherwise they emphasise how much of the floor the bed occupies.

What Changes When You Move Up to 180cm

The obvious change is comfort. The less obvious changes are the ones that catch people out after delivery, because a super king alters how the whole room has to be organised rather than simply taking up more of it.

Bedding is the first. A super king duvet at 260cm by 220cm is a large item to handle, slower to dry and heavier to carry, and it will not fit a washing machine drum designed for a double duvet. Many households solve this with two lighter duvets rather than one, which also settles the long running argument about who pulls the covers across. Pillows follow the same logic: three standard pillows sit across 180cm more convincingly than two, or you can use two king size pillows at 90cm each to match the width exactly.

Lighting and proportion

A bed this wide pushes bedside furniture towards the corners of the room, which often means existing lamps no longer light the reading position. Wall mounted lights fixed above each side of the headboard solve it without needing cabinet space, and they keep the surfaces clear. Scale matters too, because a small lamp that looked right beside a double will look lost against a 180cm bed with a tall upholstered headboard.

The rest of the furniture has to earn its space

In a typical UK master bedroom, a super king leaves one long wall and one short wall genuinely usable. That is enough for storage only if the storage is planned rather than accumulated. Sliding wardrobes are the sensible default because they need no door swing, and a run of them along the longest remaining wall gives more hanging space than several freestanding pieces would.

Under bed storage is worth prioritising as well. An ottoman base at super king size offers a substantial volume, enough to absorb spare bedding, luggage and seasonal clothing, and that is often what makes the difference between a large bed feeling luxurious and the room feeling crowded.

Frequently Asked Questions

What size is a UK super king bed?

The mattress is 180cm by 200cm, or 6ft by 6ft 6in. Frames typically add 5cm to 12cm per side.

Is a super king the largest UK bed size?

It is the largest standard size. Emperor beds at 200cm or wider exist but are specialist, with limited bedding availability.

How much bigger is a super king than a king?

30cm wider. The length is the same at 200cm.

What room size do I need for a super king?

Around 3.7m by 3.4m as a working minimum for access on both sides plus wardrobe clearance.

Will a super king mattress fit up my stairs?

Often not in older UK homes with tight turns. Use a two part divan base or a rolled mattress, and measure the narrowest point first.

Do super king beds need extra support?

Yes. A centre rail with two or more central legs and closely spaced slats are both necessary at this size.

Can I use king size bedding on a super king?

No. Fitted sheets will not stretch 30cm and a king duvet will leave both sleepers short. Buy super king bedding.