A UK king size bed takes a mattress measuring 150cm x 200cm, or 5ft x 6ft6. That is 15cm wider and 10cm longer than a standard double. The frame itself is usually between 160cm and 180cm wide and 205cm to 220cm long, depending on the headboard and side rails. A king size suits couples who want more room, taller sleepers, and main bedrooms of around 3m x 3m or larger.
Those are the essentials. Below we cover everything else worth knowing before you choose one, from room planning and frame types to mattresses, bedding and getting the bed into your home. If you already have a style in mind, our modern king size leather beds UK range is a good example of how much choice there is at this size, and our full modern bedroom furniture UK sale collection includes frames in every material.
The main reason is space. On a double, each partner has 67.5cm of width. On a king size, that rises to 75cm. The difference sounds modest, but in practice it means fewer elbows in the night and less disturbance when one person turns over or gets up early.
The extra 10cm in length matters just as much. A double at 190cm long can feel short for anyone over about six feet, especially once pillows take up space at the top. At 200cm, a king size gives taller sleepers room to stretch out with feet still on the mattress.
King size beds also suit single sleepers who like to spread out, parents whose children sometimes climb in, and anyone who shares the bed with a dog.
It is important to know that a UK king size is different from a European king size, which is commonly 160cm x 200cm, and from an American king, which is considerably larger. Always buy a UK king size mattress for a UK king size frame so it fits snugly.
A comfortable rule is to allow around 60cm of clear floor on each open side and at the foot of the bed. With a frame around 170cm x 215cm, that suggests a room of at least 2.9m wide and 2.75m long for easy movement, plus extra space for bedside tables.
Many main bedrooms in UK homes meet this, but some new build master bedrooms are tighter than you might expect. Measure carefully and consider these points:
Marking the frame outline on the floor with masking tape is the simplest way to judge how a king size will feel. Walk around it, open every door, and see whether you still have room to move freely.
Leather frames have a tailored, contemporary look and wipe clean easily. They suit busy homes and people who prefer low maintenance surfaces. Panel and stitched headboards are common, and colours range from black and brown to white and grey.
Wooden frames bring warmth and work in both modern and traditional rooms. Oak tones feel natural and calm, walnut is richer and darker, and painted finishes suit coastal or country schemes. Our king size wooden beds UK selection covers a range of tones and silhouettes.
Fabric upholstered frames are soft and comfortable to sit up against. Linen look weaves, chenille and velvet give very different moods, from relaxed to luxurious.
Metal frames are strong, slim and practical. They suit compact rooms because the open design keeps the bed visually light.
High gloss frames are sleek and reflect light, making them a good fit for contemporary bedrooms where clean lines matter.
A king size frame spans 150cm across, so the base must be well supported. Look for a centre rail running the length of the bed with at least one support leg touching the floor. Sprung or curved slats held in caps spread weight evenly and help the mattress keep its shape. Gaps between slats should generally be no more than around 7cm to 8cm, though always check the mattress manufacturer’s guidance.
The mattress has the greatest influence on sleep comfort, so give it as much thought as the frame. Consider your sleeping position, your partner’s preferences and whether either of you tends to sleep hot.
You can explore a selection of modern mattresses UK in standard king size.
Always choose bedding labelled as UK king size. A king duvet usually measures around 225cm x 220cm. Fitted sheets come in different depths, so measure your mattress depth and choose deep fitted sheets if needed. Many people like to size up to a super king duvet on a king bed for extra overhang, which is a matter of personal preference.
A king size bed covers a large area of floor, which makes the space beneath it valuable. There are three main ways to use it.
If you choose drawers, check that there is room to open them fully beside wardrobes and walls. If you choose an ottoman, consider the lift direction and how much space you have at the foot of the bed.
At king size, the headboard covers a wide stretch of wall, so its height and shape have a strong effect on the room. A headboard of around 100cm to 120cm from the floor sits comfortably under most standard UK ceilings. Taller designs make a confident statement but work best on a clear wall without windows or radiators. Panel, channel stitched, buttoned and wingback headboards each create a different mood, from tailored to relaxed, so choose the style that matches the rest of your furniture.
Before ordering, measure your route from the front door to the bedroom. Check the width of doorways, the turn at the top of the stairs, and any low ceilings on landings. Most king size frames arrive flat packed or in sections, so this is usually manageable, but rigid one piece headboards and divan bases need extra thought. Many mattresses are flexible enough to bend around corners, and rolled mattresses are very easy to carry.
A king size bed naturally becomes the focal point. Centre it on the main wall where possible, with bedside tables or cabinets either side. In tighter rooms, slim bedside tables or wall mounted shelves keep walkways clear. Our article on fitting a bedside cabinet in a small UK bedroom has useful ideas for compact layouts.
For precise frame and room dimensions, our dedicated guide to UK king size bed dimensions for frame, mattress and room goes into more detail.
A rug placed so it extends at least 50cm to 60cm beyond each side of the bed helps anchor the space and gives a soft landing underfoot in the morning.
When you are ready to choose, you can browse our full range of beds and bedroom furniture at Furniture in Fashion, with free delivery to most UK mainland postcodes. Returns are available up to 30 days.
A UK king size mattress measures 150cm x 200cm, or 5ft x 6ft6. The frame is larger, typically between 160cm and 180cm wide and 205cm to 220cm long.
No. A European king size is commonly 160cm x 200cm. Always match the mattress to the size the frame was designed for.
A room of around 3m x 3m is a comfortable minimum, allowing walking space on each side. Smaller rooms can work with careful planning.
Yes. A centre rail with support legs is essential to stop the slats bowing and to keep the mattress properly supported.
Yes. Many people prefer the extra overhang of a super king duvet on a king size bed. It is simply a matter of personal taste.
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