UK Bed Size Guide: Which Mattress and Bed Frame Do You Need?
Last updated: July 2026
Choosing the right bed size sounds straightforward until you are standing in a bedroom with a tape measure, trying to work out whether a super king will fit, whether your existing mattress will go on a new frame, and why the measurements from two different shops do not quite match. This guide covers every standard UK bed size with precise measurements in cm and inches, UK vs US vs EU conversions, and practical buying advice.
UK Bed Sizes — Complete Measurements
| Size | Width (cm) | Length (cm) | Width (inches) | Length (inches) | Best for |
|---|---|---|---|---|---|
| Small Single | 75cm | 190cm | 2'6" | 6'3" | Very small rooms, young children |
| Single | 90cm | 190cm | 3'0" | 6'3" | Children, teenagers, spare rooms |
| Small Double | 120cm | 190cm | 4'0" | 6'3" | Compact rooms for one adult |
| Double | 135cm | 190cm | 4'6" | 6'3" | One adult with space, couples in smaller rooms |
| King | 150cm | 200cm | 5'0" | 6'6" | Couples, most UK master bedrooms |
| Super King | 180cm | 200cm | 6'0" | 6'6" | Couples who want maximum space |
Note: measurements are for the sleeping surface. Add approximately 5–10cm to each dimension to account for the frame structure.
Small Single (75 x 190cm)
The small single is the narrowest standard UK size and is rarely stocked in high street shops. It suits very small box rooms, young children who have outgrown a cot, or situations where space is genuinely critical. A small single mattress is 15cm narrower than a standard single — always confirm both frame and mattress are specified as small single rather than just "single" before ordering, as the handles and packaging look identical. Because it is a less common size, the range of mattresses and bedding available is narrower than for standard sizes. If in doubt, a standard single is only 15cm wider and gives you far more choice of bedding and mattresses.
Single (90 x 190cm)
The single is the standard size for children, teenagers, and spare rooms. At 90cm wide and 190cm long, it suits adults up to approximately 6'3" (190cm) in height. For taller adults, consider a king-size frame where the extra 10cm in length matters more than the width. In a box room of around 2.2m width, a single bed leaves just enough clearance to move around. Most UK bedding sets are designed around the single, making linen easy to source and affordable. Single frames are also the most widely available and competitively priced category in the market.
Small Double (120 x 190cm)
The small double (sometimes called a three-quarter bed) is 120cm wide — giving a solo sleeper considerably more room than a single without the footprint of a full double. It is a practical choice for a compact main bedroom where one adult wants more space but a full double would crowd the room. It is not comfortable for two adults sleeping together regularly — at 120cm wide, each person would have only 60cm. Check your room: a small double needs approximately 2.5m of width to leave reasonable clearance on both sides. Small double bedding is slightly harder to find than standard double, so check availability before committing to this size.
Double (135 x 190cm)
The double is the most common adult bed size in the UK. At 135cm wide, it accommodates one adult comfortably and provides enough space for two adults in most rooms. It is the minimum recommended size for couples who want reasonable sleeping comfort — each person gets approximately 67cm, which is narrower than a single. For couples who move around during sleep or have different sleep schedules, a king is a significantly better investment. The double is also 10cm shorter than a king: at 190cm long, taller adults may find their feet reach the footboard. Double bedding is the easiest and most affordable size to find in UK shops and online.
King (150 x 200cm)
The king is the most popular size for couples in UK master bedrooms. At 150cm wide and 200cm long, each person has 75cm of sleeping space — more than a standard single, and 10cm longer than a double which makes a real difference for adults over 6 feet. Most UK master bedrooms measuring 3m x 3.5m or larger will accommodate a king comfortably. A king frame typically measures around 165cm wide and 215cm long including the frame structure — always measure doorways and stairwells before ordering, as mattresses are delivered flat and require clearance to manoeuvre. King-size bedding is widely available and well priced. The transition from double to king is the most common upgrade for couples and rarely regretted.
Super King (180 x 200cm)
The super king is the largest standard UK bed size. At 180cm wide, each person in a couple has 90cm of sleeping space — the equivalent of a standard single each. For couples where both partners move frequently during sleep, have significantly different sleep schedules, or simply want the most comfortable bed possible, the super king delivers. A super king frame is approximately 195cm wide — you need a bedroom of at least 3.5m in width to leave reasonable clearance, and ideally 4m or more for a practical room layout. Super king bedding costs more than smaller sizes and is slightly harder to source. One practical note: super king divan bases are typically supplied as two single bases joined together rather than one solid unit, making delivery and stair navigation considerably easier.
UK vs US vs EU Bed Sizes
If you have bought furniture in Europe, the US, or are looking at international brands, be aware that sizes do not map cleanly onto UK standard — always check centimetres, not the size name, when buying bedding or a mattress from a different market.
| UK Name | UK (cm) | Closest US Name | US (cm) | Closest EU Name | EU (cm) |
|---|---|---|---|---|---|
| Double | 135 x 190 | Full/Double | 137 x 191 | 140 | 140 x 200 |
| King | 150 x 200 | Queen | 152 x 203 | 160 | 160 x 200 |
| Super King | 180 x 200 | King | 193 x 203 | 180 | 180 x 200 |
A European mattress will not fit a UK frame correctly — a European double, for example, is 5cm wider and 10cm longer than a UK double. All products at onlineand.direct are specified to UK standard sizes unless explicitly stated otherwise on the product page.
Which Bed Types Come in Which Sizes?
- Ottoman beds: typically Small Double to Super King (the storage mechanism needs width) — see our Ottoman Bed Buying Guide.
- Divan beds: full range, Small Single to Super King — see our Divan Bed Buying Guide.
- Metal bed frames: commonly Single to Super King — see our Metal Bed Frames Guide.
- Wooden bed frames: commonly Single to Super King — see our Wooden Bed Frames Guide.
Furnishing a small bedroom specifically? See our Small Room Furniture Guide for space-saving bed and storage advice beyond just size.
Matching a Mattress to the Size
Getting the size right is only half of it — depth, firmness and mattress type decide whether the bed is actually comfortable once it is in the room. We cover that in depth on our specialist mattress site, justmattresses.direct: there is a dedicated UK mattress size guide, and you can browse the same UK-made range filtered by size, firmness and type so the price you see is for the size you actually want.
What to Check Before You Order
- Room dimensions: measure the longest wall and the clearance to any doors, wardrobes, or radiators. Allow at least 60cm on each side of the bed for comfortable access.
- Doorways and stairwells: bed frames arrive disassembled, but mattresses do not. A king mattress is 150cm wide — check it can navigate any tight corners or landings.
- Frame and mattress must match size: a king mattress on a double frame will overhang. A double mattress on a king frame will show a visible gap on all sides.
- Headboard compatibility: if buying a headboard separately, confirm it is specified for the same size as your frame. Headboard widths vary by manufacturer — check the actual width measurement, not just the size name.
- Base type and mattress warranty: if your mattress has specific warranty conditions, check whether the manufacturer requires a slatted, mesh, or solid platform base. Some memory foam mattresses void their warranty if used on a solid platform top.
FAQ
What is the most popular bed size in the UK?
Double (135 x 190cm) is the UK's most-bought bed size, offering a balance of space and room-fit for most bedrooms.
Is a UK King the same as a US King?
No. A UK King (150 x 200cm) is closer to a US Queen. A US King (193 x 203cm) is closer to a UK Super King (180 x 200cm) but still slightly wider.
What size room do I need for a Super King bed?
Aim for a room at least 3.6m x 3.6m so you can fit the 180cm-wide frame plus 60-70cm of walking space on both sides and room for other furniture.
What is a Small Double bed used for?
Small Double (120 x 190cm) is a UK-specific size for box rooms or smaller bedrooms — 15cm narrower than a standard Double but still couple-sized.
Do Single and Small Single mattresses fit the same frame?
No — Small Single (75cm) and Single (90cm) are different widths and are not interchangeable; always match the mattress to the frame's exact size.
Can I fit a Super King through a standard doorway?
Most Super King frames and divan bases ship in sections specifically so they pass through standard UK doorways (76-84cm) — check the product's assembly notes before ordering.
Shop Beds and Mattresses at Onlineand.direct
All bed frames and mattresses at onlineand.direct are available in UK standard sizes from small single to super king. Every order includes free delivery to mainland UK, delivered in 3 working days by our specialist 2-man team. We source directly from UK manufacturers — which means the price you see is the manufacturer's price, with no retail showroom markup added on top. Browse all bed frames or shop mattresses.