In the UK, a super king bed measures 180cm wide by 200cm long, which is 6ft by 6ft 6in. That makes it 30cm wider and 10cm longer than a standard UK king size, and 45cm wider than a double. It is the largest size stocked as standard by most British retailers, and mattresses, sheets and duvets are widely available for it.
Those numbers refer to the mattress. The bed frame itself will be larger, typically adding 5cm to 15cm on each side depending on whether the design has a slim wooden rail or a deeply upholstered surround. That difference matters more than people expect when planning a room.
British bed sizing is its own system, and it helps to see super king alongside the rest. A single is 90cm by 190cm. A small double, often called a three quarter, is 120cm by 190cm. A standard double is 135cm by 190cm. A king size is 150cm by 200cm. A super king is 180cm by 200cm.
Two things stand out. First, the jump from double to king adds width and length, while the jump from king to super king adds width only. Second, anything above 190cm in length is genuinely useful for taller sleepers, since a 190cm double leaves very little margin for anyone approaching six feet.
Super king is sometimes described as equivalent to two singles pushed together, and the maths is close: two 90cm singles side by side equal 180cm. Some zip and link mattresses use exactly this principle, allowing two separate mattresses with different firmness ratings to be joined under one set of bedding.
A super king needs a room that can absorb its width without swallowing the walkways. As a working guide, allow at least 60cm of clear floor on each side you need to walk down, and 70cm if a wardrobe or chest of drawers opens into that space. Add the frame width to the mattress width, then add the walkways, and compare that figure against your wall to wall measurement.
In practice, a super king with reasonable access on both sides and space at the foot suits rooms from around 3.5m by 3.7m upwards. Below that, the bed will still fit but the room begins to feel like a mattress with a border. Many UK master bedrooms in newer housing measure closer to 3m by 3.4m, which usually points towards a king rather than a super king.
Do not forget the route to the room. A super king mattress is a substantial object, and a tight stairwell or a sharp landing turn can defeat it. Rolled or vacuum packed mattresses solve much of this, and split zip and link mattresses solve the rest. Measure the narrowest point on the way in before ordering.
The clearest case is two adults who both move in their sleep. The additional 30cm over a king gives each person roughly 90cm of personal width, which is the same as a single bed each. Couples who wake each other through the night often report the difference immediately, and it tends to matter more than mattress firmness alone.
Taller sleepers benefit from the 200cm length, though that is shared with king size. Households where children or pets end up on the bed in the morning also gain from the space. And anyone who reads, works or watches television in bed will find the width makes propping up on pillows far less cramped.
The extra width does come with practical trade offs. Bedding is more expensive and slightly harder to find in every design, and a super king duvet in a domestic washing machine is a squeeze. Turning or rotating the mattress needs two people. None of these are dealbreakers, but they are worth knowing in advance.
A super king dominates a room visually, so the frame design carries real weight. Low profile frames with slim rails keep the sight lines open and make the floor look larger, which suits rooms where the bed only just fits. Tall upholstered headboards, by contrast, draw the eye upwards and give a hotel style presence in rooms with height to spare.
Upholstered designs soften the mass of a large bed and are comfortable to lean against. Our modern super king size fabric beds UK sale covers a broad spread of headboard shapes, from plain panels to deep buttoned styles, in fabrics that suit calm neutral schemes.
Wooden frames bring warmth and a lighter visual footprint, particularly in oak and walnut tones. The super king size wooden beds UK range works well in rooms where the flooring or wardrobes already carry a timber finish, since matching or deliberately contrasting the wood tone keeps the scheme coherent.
Storage is the other consideration. A bed this wide covers a large area of floor, and leaving that space empty in a UK home is a missed opportunity. Ottoman lift up bases turn the whole footprint into storage for bedding and off season clothing, which can free up an entire wardrobe.
Super king bedding is a standard UK size, so fitted sheets, duvet covers and mattress protectors are readily available. A super king duvet typically measures 260cm by 220cm. Check the mattress depth before buying fitted sheets, because a deep pocket sprung or hybrid mattress can be 30cm or more and a standard depth sheet will pull off the corners.
Pillow arrangement changes at this width. Two standard pillows leave a visible gap in the middle, so most people use either three standard pillows or two king size pillows across the head of the bed. This is a small detail that noticeably affects how finished the bed looks.
On the mattress itself, the extra width means a heavier unit. Rotating head to foot every few months is the usual advice, and turning is only needed if the mattress is double sided. Two people should handle this. When choosing, remember that a wide mattress needs proper support underneath: a centre rail and legs, or close slat spacing, prevents sagging through the middle over time.
Because the bed takes so much visual space, the rest of the room should stay restrained. Two matching bedside cabinets on either side create symmetry that makes the width feel deliberate rather than accidental. In tighter rooms, wall mounted lights instead of table lamps free up the cabinet surfaces and reduce clutter.
Keep the palette simple. Soft whites, warm greys, stone and muted green all let a large bed sit quietly. Layering two or three textures in the bedding, such as linen, cotton and a wool throw, adds interest without adding colour noise.
Storage at the foot of the bed only works if there is genuine clearance. Where there is not, look upwards instead: tall narrow storage or a slim chest works better than a wide low unit. A pair of modern high gloss bedside cabinets UK reflects light and helps a large room read as brighter, while our wider modern bedroom furniture UK sale selection makes it easier to coordinate wardrobes and drawers with the bed frame finish. We ship with free delivery to most UK mainland postcodes, which takes some of the sting out of ordering large items.
If the room comfortably takes a super king with proper walkways, and two adults share the bed every night, the extra width is usually the better long term choice. Sleep quality tends to improve when neither person is negotiating for space.
If the room is borderline, a king size is the more sensible option. A slightly smaller bed in a room that still functions properly beats a larger bed that blocks a wardrobe door or forces a sideways shuffle to reach the window. Measure first, then decide. Marking the footprint on the floor with masking tape for a couple of days is a simple test that reveals more than any calculation.
Those weighing up options across the range will find our modern beds UK sale section lists mattress and frame dimensions on each product, which makes side by side comparison straightforward before committing.
A UK super king mattress is 6ft wide by 6ft 6in long, which converts to 180cm by 200cm.
They are close but not identical. A US king is around 193cm by 203cm, so it is wider than a UK super king. Bedding is not interchangeable between the two.
Two UK singles at 90cm each total 180cm in width, matching a super king. However, standard singles are 190cm long rather than 200cm, so zip and link mattresses made specifically for the purpose are the better route.
A super king duvet is normally 260cm by 220cm. Using a king size duvet on a super king bed leaves the sides short, which is the usual cause of overnight tug of war.
Yes. A frame this wide should have a central rail with one or more legs, or closely spaced slats with mid support, to keep the mattress properly held through the middle.
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