A king size bed in the UK measures 150cm wide by 200cm long, which works out at roughly 5ft by 6ft 6in. That makes it 15cm wider and 10cm longer than a standard UK double, and it is the size most people move up to when they want genuine breathing room without committing to a super king.
Those two numbers refer to the mattress, not the bed frame. Once you add a frame, side rails and a headboard, the actual footprint grows. Most king size frames sit somewhere between 158cm and 170cm wide and between 205cm and 220cm long, depending on how substantial the surround is and whether the headboard is padded. That difference matters far more than people expect, and it is usually the reason a bed that looked fine online feels tight once it is built.
It helps to see UK bed sizes side by side, because the jumps between them are smaller than the names suggest.
Read that list and one thing stands out. Moving from a double to a king adds 15cm of width, split between two people, so each person gains around 7.5cm. That sounds modest on paper. In practice it is the difference between two adults sleeping shoulder to shoulder and two adults sleeping with a little air between them. The extra 10cm of length is arguably the bigger win, because anyone over about 6ft tends to notice a standard double ending too soon.
A king size bed suits a bedroom of around 3m x 3.4m or larger. You can fit one into something slightly smaller, but the room starts to work against you.
The figure worth memorising is 60cm to 70cm of clear floor either side of the bed. That is roughly the width you need to walk comfortably, open a bedside drawer and change a duvet cover without shuffling sideways. Below 50cm it becomes a squeeze, and you will feel it every morning.
Also think vertically and behind the bed. A tall padded headboard can push the frame 10cm to 15cm further into the room than the mattress dimensions suggest. If your radiator sits under the window opposite, or the door swings inward, sketch it out on paper before ordering. A quick pencil plan with real measurements will tell you more than any amount of eyeballing.
One habit worth adopting: mark the footprint on your bedroom floor with masking tape, then live with it for a day. Walk the route from door to wardrobe. Open the drawers. You will know almost immediately whether the size is right.
The measurement people forget is the route in. Victorian and Edwardian terraces across the UK have narrow staircases, tight quarter landings and doorways that were never designed for modern bed sizes. Before buying, measure the narrowest point of the journey: the front door, the turn at the top of the stairs, and the bedroom door frame.
The good news is that most king size beds arrive flat packed in manageable sections, so the frame is rarely the problem. Mattresses are the tricky part, particularly deep sprung models that cannot be bent. Rolled mattresses are far easier to carry upstairs in an older property, and that alone can decide which mattress you choose.
If you are browsing our range of modern beds UK sale, check the packaged dimensions listed with each product rather than only the mattress size. It takes a minute and saves a great deal of frustration on delivery day.
UK king size bedding is made to fit 150cm x 200cm mattresses, and a king duvet typically measures 225cm x 220cm. Buy bedding labelled for UK sizes rather than assuming international labels transfer, because they do not. An American king is wider and shorter than a UK king, and a European king differs again. Fitted sheets are where the mismatch shows up first, usually as corners that will not stay put.
Mattress depth is the second thing to check. Deep mattresses of 25cm or more need fitted sheets with a generous skirt, otherwise you will spend every week wrestling the corners back into place.
Once the size is settled, the frame decides how the bed feels in the room. A few honest observations from looking at hundreds of bedrooms:
Upholstered frames soften a room and absorb sound, which suits bedrooms with hard floors or high ceilings. They also make a king feel deliberately generous rather than simply large. Our king size fabric beds UK sale cover most of the neutral tones that work well in British homes, where daylight can be limited for much of the year.
Wooden frames bring warmth and tend to age well. If you already have wooden furniture in the room, matching tones roughly rather than exactly usually looks more relaxed than trying for a perfect match. The king size wooden beds UK selection includes both slim and more substantial profiles, and the slimmer ones are worth considering in a room that is only just large enough.
Leather and faux leather reads as more structured and is straightforward to wipe clean, which is a practical point in a family home.
Ottoman and storage frames earn their keep in houses without loft access or a spare room. A king size ottoman base holds a surprising amount, and because the storage is under the bed rather than in a separate unit, you keep floor space. If you like a low visual profile, look for a side opening mechanism, since it needs less clearance at the foot of the bed.
Sometimes, and it depends less on the room size than on how the room is used. A bedroom that is purely for sleeping can carry a larger bed than a bedroom that also holds a desk, a chair and a full wardrobe run.
If the room is tight but you want the extra width, a few adjustments help. Choose a low frame with a slim headboard so the bed does not dominate at eye level. Skip the divan valance and let the floor show underneath, which visually extends the space. Replace bulky bedside cabinets with wall mounted shelves or narrow modern bedside cabinets UK sale that sit no deeper than the bed itself. Keep the palette calm, and reserve pattern for bedding rather than large furniture.
If none of that works, a small double or a standard double may simply be the better answer. A well proportioned room with a slightly smaller bed usually feels more restful than a cramped room with a large one.
Wider mattresses need proper support underneath. A king size mattress should sit on a base with a centre rail and central legs, or on a slatted frame with slats close enough together to prevent sagging in the middle. Without that, the mattress dips along its centre line over time, which tends to push two sleepers towards each other.
A king also gives you the option of a mattress with zoned tension, which is worth considering if you and your partner have noticeably different weights or sleeping styles. The extra width simply gives each side more room to behave independently.
Larger beds need slightly more considered dressing, because a bare king can look flat. The reliable formula is a fitted sheet, a plump duvet, two large pillows for sleeping, two standard pillows in front, and either one long bolster or two square cushions. Add a folded throw across the lower third to break up the expanse of duvet.
Keep the bedside symmetrical if the bed sits centrally, since symmetry calms a large piece of furniture. If your bed is offset because of a chimney breast or a window, lean into the asymmetry instead: one bedside table and one wall light on the other side often looks more intentional than forcing a pair.
You can browse everything from frames to finishing pieces at Furniture in Fashion, and we offer free delivery to most UK mainland postcodes.
No. A UK king measures 150cm x 200cm, while a US king is wider at approximately 193cm and slightly shorter. Always buy bedding labelled for UK sizes.
Width. Both are 200cm long, but a king is 150cm wide and a super king is 180cm wide. A super king needs a noticeably larger room, ideally with 70cm of clearance either side.
Usually yes, if the bed sits against the longer wall and you keep other furniture slim. You will have around 60cm to 70cm on one side and less on the other, so plan the walking route carefully.
Yes. A king duvet is typically 225cm x 220cm. Using a double duvet on a king mattress leaves too little overhang and tends to pull off during the night.
Many do, but a double gives each person about 67cm of width. If either of you is tall, a light sleeper, or you simply prefer not to touch while sleeping, the king is the more comfortable choice.
Most UK beds are either 190cm or 200cm long. Singles, small doubles and doubles measure…
A king bed in the UK has mattress dimensions of 150cm by 200cm, which is…
A standard size single bed in the UK has a mattress of 90cm by 190cm,…
A queen size bed is approximately 150cm by 200cm, which is 5ft by 6ft 7in…
Double beds are 190cm long in the UK, which is 6ft 3in, and that length…
An American queen size bed measures 152cm by 203cm, or 60in by 80in, while Australia…
This website uses cookies.