Choosing a bed sounds simple until you’re faced with the options: single, small double, double, king, super king… and that’s before anyone mentions centimetres. Buy the wrong size and you’ll either be cramped every night or wrestling an oversized frame through a doorway it was never meant to fit.
This guide walks through every standard UK bed size with exact dimensions, who each size suits, how much bedroom space you need, and how to match your mattress to your frame — so you can buy once and buy right.
UK Bed Sizes at a Glance
| Bed size | Dimensions (ft) | Dimensions (cm) | Best for |
|---|---|---|---|
| Single | 3’0″ × 6’3″ | 90 × 190 cm | Kids, teens, guest rooms, box rooms |
| Small double | 4’0″ × 6’3″ | 120 × 190 cm | Solo sleepers wanting extra width, teens |
| Double | 4’6″ × 6’3″ | 135 × 190 cm | Couples in average-size bedrooms |
| King | 5’0″ × 6’6″ | 150 × 200 cm | Couples wanting proper elbow room |
| Super king | 6’0″ × 6’6″ | 180 × 200 cm | Couples who value space, larger bedrooms |
Note: lengths can vary slightly between manufacturers (some frames add a few centimetres for the headboard and footboard), but mattress sizes are standardised — a 90 × 190 cm mattress will fit any standard UK single frame.
Single Bed (3ft × 6ft3 / 90 × 190 cm)
The single is the UK’s most common bed for children’s bedrooms, teenagers’ rooms and guest rooms. At 90 cm wide it fits comfortably into box rooms and smaller spare bedrooms where every centimetre counts.
Choose a single if: you’re furnishing a child’s room, a guest room, or a bedroom under about 2.4 m wide. Singles also work well as day beds in home offices.
Room space needed: allow at least 60 cm of clear space on one side for getting in and out, plus room for the door to open. A single bed in a 2.2 × 2.6 m room still leaves space for a wardrobe.
Small Double Bed (4ft × 6ft3 / 120 × 190 cm)
The small double — sometimes called a “queen” by some retailers, though that term isn’t standard in the UK — is the underrated middle ground. Thirty centimetres wider than a single, it’s a popular pick for solo sleepers who like to spread out, and for teenagers who’ve outgrown a single but whose rooms can’t take a full double.
Choose a small double if: you sleep alone and want extra width without sacrificing floor space, or you’re furnishing a teenager’s room that needs to last into their late teens.
Watch out for: bedding. Fitted sheets and duvets in 4ft size are less widely stocked than single or double, so check availability before you commit — most large bedding retailers carry them, but choice is narrower.
Double Bed (4ft6 × 6ft3 / 135 × 190 cm)
The double is the UK’s best-selling bed size for couples, and for good reason: at 135 cm wide it gives two adults reasonable room while still fitting into the average British bedroom (roughly 3.4 × 3.6 m for a typical second bedroom).
Choose a double if: you’re a couple with a standard-size bedroom, or a solo sleeper who wants generous space. It’s also the sensible maximum for most box rooms doubling as guest rooms.
The honest trade-off: 135 cm split between two adults is about 67 cm each — roughly the width of a single bed divided in two. If one of you is a restless sleeper, you’ll feel it. Couples who can spare the floor space often wish they’d gone bigger.
King Size Bed (5ft × 6ft6 / 150 × 200 cm)
A king gives each partner 75 cm of width — a noticeable step up from a double — and the extra 10 cm of length (200 cm vs 190 cm) makes a real difference if either of you is over 6ft tall. This is the size where a bedroom starts to feel properly luxurious rather than merely functional.
Choose a king if: you’re a couple and your bedroom is at least 3.4 m wide, allowing roughly 70–90 cm of clear space on each side of the bed for bedside tables and walking room.
Measure first: king frames are heavy and bulky. Measure your doorways, hallways and stairwell turns before ordering — a 150 cm-wide frame doesn’t bend around tight landings. If access is tight, consider a divan base, which typically arrives in two halves.
Super King Size Bed (6ft × 6ft6 / 180 × 200 cm)
The super king is the largest standard UK bed: a full 180 cm wide, the equivalent of two single beds side by side. For couples, it ends every argument about duvet territory. It’s also the go-to for anyone who co-sleeps with young children or large dogs.
Choose a super king if: your bedroom is at least 3.6–4 m wide. You’ll want 70–90 cm clear on both sides plus space at the foot of the bed — a super king in too small a room dominates everything and makes the space feel cramped rather than grand.
Bedding note: super king duvets and fitted sheets are a specialist buy. They’re readily available from bedding specialists, but you’ll pay more than standard double or king bedding, and high-street choice is thinner.
How Much Room Do You Actually Need?
A bed that fits the mattress but not the room is a false economy. Before you order, do this quick check:
- Measure the room. Length and width, in centimetres, wall to wall.
- Add the frame, not just the mattress. Upholstered and wingback frames can add 8–15 cm beyond the mattress on each side; a tall headboard adds depth too. Check the frame’s overall dimensions, not just the sleeping area.
- Allow walking space. Aim for 60–90 cm of clear floor on each side of the bed (where you’ll get in and out) and at the foot. In a tight room, 60 cm is workable; below that, daily life gets annoying fast.
- Check the route in. Measure the narrowest doorway, hallway and any stairwell turns between your front door and the bedroom. Flat-pack frames are forgiving; one-piece upholstered headboards are not.
As a rough rule: a double suits rooms from about 3 × 3 m, a king wants 3.4 m of width or more, and a super king is happiest in rooms 3.6 × 4 m and up.
Matching Your Mattress to Your Bed Frame
The golden rule is simple: buy the mattress in the same nominal size as the frame. A 150 × 200 cm mattress goes on a 5ft (king) frame, a 180 × 200 cm mattress on a 6ft (super king) frame, and so on.
A few practical points:
- EU vs UK sizes differ. European doubles are typically 140 or 160 cm wide — not the same as a UK double (135 cm) or king (150 cm). If you’re buying a mattress separately, confirm it’s UK sizing.
- Depth matters for fitted sheets. Modern mattresses range from around 20 cm to over 30 cm deep. Check your fitted sheets are deep enough, especially with a mattress topper added.
- Replacing one half of the pair? If your old frame is fine but the mattress is past its best, measure the internal frame dimensions before ordering a mattress — nominal sizes are standard, but older or handmade frames can vary.
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Bed Size FAQs
What’s the most popular bed size in the UK?
The double (4ft6) remains the UK’s best-selling bed size, striking the balance between sleeping space and bedroom footprint. That said, king size has been steadily gaining ground as average bedroom sizes in new builds have grown.
Is a king size bed worth it over a double?
If your room can take it, most couples say yes. The jump from 135 cm to 150 cm wide — plus the extra 10 cm of length — is the single biggest comfort upgrade in the size range, and the price difference between double and king frames is usually modest.
What size bed do I need if I’m 6ft tall?
Look at king or super king: both are 200 cm (6ft6) long versus 190 cm (6ft3) for single through double. At 6ft (183 cm) you’re right at the limit of a 190 cm mattress once you account for pillows.
Can I put a bigger mattress on a smaller frame?
No — an oversized mattress will overhang the base, wear unevenly and won’t be properly supported at the edges. Always match nominal sizes.
Final Word
The right bed size is the biggest one your room — and your doorways — can comfortably handle. Measure twice, allow proper walking space, and match your mattress to your frame. Get those three things right and the rest is personal taste.
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