A king bed in the UK measures 150cm x 200cm. A super king measures 180cm x 200cm. There is no official “queen” size in the standard British bed sizing system, what many people call a queen corresponds roughly to a double (135cm x 190cm) or the European 160cm x 200cm size used internationally. If you are shopping for a bed in the UK and wondering whether to go king or “queen,” the honest answer is: you are almost certainly choosing between a double, a king, and a super king.
Understanding that distinction is the most important thing this guide can tell you. Everything else, room fit, sleeping comfort, cost, and bedding availability, follows from getting the sizing right first. This guide covers every factor clearly so you can make the right decision for your bedroom without second-guessing it later.
What Is the Difference Between a King and Queen Bed in the UK?
The confusion between king and queen sizing is almost entirely down to the difference between American and British bed naming conventions.
In the US, a queen measures 153cm x 203cm and a king measures 193cm x 203cm, two clearly distinct sizes. In the UK, those labels do not apply in the same way. The standard British sizing runs as follows: single (90cm x 190cm), small double (120cm x 190cm), double (135cm x 190cm), king (150cm x 200cm), and super king (180cm x 200cm).
There is no queen size in the standard UK system. When people in the UK search for a “queen bed,” they are typically looking for something larger than a double but smaller than a super king, which in practice means a UK king at 150cm x 200cm, or the European 160cm x 200cm size found in some international ranges.
For the purpose of this guide, comparisons are made between the UK double (135cm x 190cm), UK king (150cm x 200cm), and UK super king (180cm x 200cm), the three sizes that matter for most buyers making this decision.
How Much Space Does Each Size Actually Take Up?
Room dimensions are the single most practical factor in bed size decisions, and they are where most buyers make avoidable mistakes.
A double bed (135cm x 190cm) fits comfortably in a room of approximately 2.8m x 3.2m, leaving adequate clearance on both sides for bedside tables and movement. It suits the majority of standard UK spare bedrooms and smaller master bedrooms in period properties.
A king bed (150cm x 200cm) adds 15cm of width and 10cm of length compared to a double. It fits well in a room of approximately 3m x 3.5m, the size of a typical UK master bedroom in a semi-detached or terraced house. The additional width is noticeable in daily use, and the size works proportionally in most standard bedrooms without crowding the space.
A super king (180cm x 200cm) needs considerably more space. A room of at least 4m x 4m is required for a super king to feel right, meaning adequate clearance on all walkable sides and enough visual breathing room for the bed not to dominate the space. In a room smaller than this, a super king will feel tight regardless of whether the physical measurements technically allow it.
A reliable rule of thumb: always leave at least 60–70cm of clear walkable space on each accessible side of the bed. If that clearance is not achievable, go down a size, the sleeping benefit of a larger bed does not outweigh the daily frustration of a cramped room.
Verdict: A king fits in most standard UK master bedrooms. A super king requires a genuinely large room. A double is the right call for smaller bedrooms and most spare rooms.
Which is Better for Couples?
For two people sharing a bed, the width per person is the number that actually matters, and the differences between sizes are more meaningful than they first appear.
A double gives each person approximately 67cm of sleeping width. That is workable for couples who sleep close together or in a smaller bedroom, but it leaves little room for movement during the night.
A king gives each person 75cm, a noticeable step up from a double, and enough for most couples to sleep comfortably without disturbing each other. For the majority of couples in standard-sized bedrooms, a king is the most practical upgrade.
A super king gives each person 90cm, which is equivalent to the full width of a single bed. For couples who move around during sleep, run at different temperatures, have different sleep schedules, or regularly share the bed with children or pets, that additional space makes a genuine difference to sleep quality.
The decision, therefore, is straightforward: if the bedroom can carry a super king, it is the best option for shared sleeping comfort. If not, a king is the right compromise. A double works for couples in smaller rooms or where budget is the primary consideration.
Verdict: Super king delivers the most personal sleeping space per person. King is the practical choice for most couples. Double suits smaller rooms and tighter budgets.
Which Is More Affordable, King or Super King?
Larger beds cost more across every element of the purchase, the frame, the mattress, and the bedding, and that cost compounds over the life of the bed.
At the frame level, a king bed frame is less expensive than a super king equivalent at the same quality tier. The additional width of a super king requires more materials, a stronger central support structure, and, in the case of upholstered and storage frames, more fabric and mechanism components. That translates directly into a higher unit cost.
The mattress is where the price difference becomes most significant. A super king mattress costs considerably more than a king mattress of equivalent specification, whether that is memory foam, pocket sprung, or hybrid construction. The gap is proportional to quality: at the budget end it is modest, but at the mid-range and premium end it is substantial.
Bedding costs follow the same pattern and continue throughout the life of the bed. Super king duvet covers, fitted sheets, and pillowcases are less widely stocked than king equivalents and are consistently priced higher. For buyers who replace bedding regularly or prefer variety in fabric and design options, this is a running cost that adds up meaningfully over several years.
Verdict: King is more affordable across frame, mattress, and bedding. The cost difference widens at the premium end and compounds with every bedding replacement.
Which Fits Better in a Standard Bedroom?
In most standard UK master bedrooms, a king is the more practical choice. Super king frames work best in larger rooms where sufficient clearance exists on all sides.
Proportion matters as much as raw clearance. A super king in a room that is technically large enough but not generously sized will visually dominate the space, making the bedroom feel smaller than it is and reducing the sense of comfort that a larger bed is supposed to provide. In period properties, Victorian terraces, Edwardian semis, and converted flats with characteristically smaller bedroom footprints, a king almost always fits better both physically and visually.
For newer builds, detached houses, and larger modern master bedrooms, a super king is a natural fit and makes the most of the available floor space. If a bedroom has fitted wardrobes along one wall, that also reduces the effective width available, meaning the usable floor area is smaller than the room’s total dimensions suggest. Always measure the actual usable space before deciding.
Verdict: King suits most standard and period UK bedrooms. Super king suits larger modern master bedrooms with genuine clearance on all sides.
Which Is Easier to Find Bedding For?
King-size bedding is the most widely available size across every price point and retail channel. Super king bedding is well-represented at specialist retailers but less consistent at everyday price points and in pattern variety.
For buyers who prefer to change bedding seasonally, like a variety in fabric type, linen, cotton, velvet, percale, or shop across a range of budgets depending on the item, king size offers the most flexibility. Super king availability has improved considerably in recent years, but the range remains narrower, particularly for fitted sheets where precise sizing is essential.
This is a practical consideration that plays out over the entire life of the bed. If a super king mattress is also non-standard in depth, common with thicker memory foam and hybrid constructions, finding fitted sheets that fit correctly becomes an additional complication.
Verdict: King offers the widest bedding availability and most consistent choice. Super king is well served by specialist suppliers but requires more effort at everyday price points.
Which Is Better for a Guest Bedroom?
For a guest bedroom, a king is the right size in most cases. It accommodates two adults comfortably, fits in a standard spare room without crowding the space, and keeps the combined cost of frame, mattress, and bedding proportionate to a secondary bedroom.
A super king in a guest room is generally unnecessary, most guests do not require that level of sleeping width, and takes up floor space that could otherwise be used more flexibly when the room doubles as a home office or occasional use space.
A double is a reasonable alternative in a smaller spare room, particularly where the guest bedroom is used occasionally rather than regularly. For a room that needs to serve multiple purposes, a double on a divan base with built-in storage drawers is a particularly practical solution.
Verdict: King is the most balanced choice for a guest bedroom. Double suits smaller spare rooms. Super king is rarely justified in a secondary bedroom.
King vs Double vs Super King: Side-by-Side Summary
| Factor | Double (135x190cm) | King (150x200cm) | Super King (180x200cm) |
| Width per person | 67cm | 75cm | 90cm |
| Minimum room size | 2.8m x 3.2m | 3m x 3.5m | 4m x 4m |
| Cost | Lowest | Mid | Higher |
| Bedding availability | Excellent | Excellent | Good |
| Best for | Smaller rooms, spare bedrooms | Most master bedrooms | Large master bedrooms |
| Guest room suitability | Good | Excellent | Unnecessary |
| Move-friendliness | Easiest | Good | More challenging |
Which Should You Choose?
- Choose a double if: Your bedroom is on the smaller side, you are furnishing a spare or guest room, or budget is the primary consideration. A double with a quality mattress and storage base is a practical, well-proportioned solution for most secondary bedrooms.
- Choose a king if: You have a standard master bedroom of roughly 3m x 3.5m or larger, you share the bed with a partner, or you want a meaningful upgrade from a double without committing to super king dimensions. For most buyers, a king hits the right balance of sleeping comfort, room proportion, and overall cost.
- Choose a super king if: Your bedroom measures at least 4m x 4m with adequate clearance on all sides, sleeping comfort is the top priority, and you and your partner both move around during sleep or regularly share the bed with children or pets. In a room that can carry the size, a super king genuinely delivers, but only then.
The most common mistake buyers make is choosing a size based on what sounds impressive rather than what works for the actual room. Measure first, decide second. The right size for your specific bedroom will always outperform a larger size squeezed into a space it does not suit.
FAQs
1. Is there a queen-size bed in the UK?
No, queen is not a standard UK bed size. The British sizing system runs from single through to super king, with no queen category. What many people mean when they say “queen” in a UK context is broadly equivalent to a king (150cm x 200cm) or, in some European contexts, a 160cm x 200cm size. When shopping for beds in the UK, focus on the actual centimetre dimensions rather than the size name.
2. Can a king-size bed fit in a small bedroom?
A UK king (150cm x 200cm) fits well in a room of approximately 3m x 3.5m, provided furniture is kept relatively minimal. The key is maintaining at least 60–70cm of walkable clearance on both accessible sides of the bed. In rooms narrower than 3m, a double is a more comfortable and proportionate choice.
3. Is a super king worth the extra cost?
For couples in a room that can carry the size, yes. The additional 30cm of width over a king, giving each person 90cm versus 75cm, makes a noticeable difference for people who move during sleep, share the bed with children or pets, or have different sleep temperatures. In a room smaller than 4m x 4m, however, the space cost outweighs the sleep benefit.
4. Do you need a special mattress for a king-size bed?
Yes, a king mattress (150cm x 200cm) is specific to a king frame and cannot be substituted with a double or super king. Always match the mattress dimensions exactly to the frame. A mattress that does not fit the frame precisely creates edge gaps that affect both comfort and long-term mattress performance.
5. What bed size is best for a master bedroom?
It depends on the room’s actual dimensions. In a room of 3m x 3.5m or thereabouts, a king is the most practical and proportionate choice. In a room of 4m x 4m or larger, a super king works well and makes the most of the available space. Always measure the usable floor area, accounting for wardrobes and other fixed furniture, before deciding.