The Complete Guide to UK Bed Sizes: Single to Super King With Measurements

UK bed sizes are fixed and consistent, and they are not the same as European or American sizes. A British single is 90cm x 190cm, a double is 135cm x 190cm, a king is 150cm x 200cm and a super king is 180cm x 200cm. The two sizes people most often get wrong are the small double at 120cm x 190cm, frequently called a three quarter bed, and the king, which is both wider and 10cm longer than a double.

The size that fits your room is rarely the largest one that will physically go in it. Beds need clearance to be made, to be walked around and to allow wardrobe doors and drawers to open. We work to a minimum of 60cm on any side that is used for access, and 75cm where a wardrobe or chest opens onto it. Apply those figures first and the correct bed size usually chooses itself.

Key findings at a glance

• The six standard UK sizes are small single, single, small double, double, king and super king, and the National Bed Federation lists these as the recognised British sizes.
• Length increases only once across the range: 190cm for small single through to double, then 200cm for king and super king.
• A double at 135cm gives each of two sleepers 67.5cm, which is narrower than a standard UK single.
• European and UK sizes are close but not interchangeable, so bedding and mattresses bought abroad frequently do not fit British frames.
• A bed frame is typically 5cm to 15cm larger than its mattress in each direction, and that is the measurement that has to fit the room.
• We recommend 60cm of clearance on access sides and 75cm where wardrobe doors or drawers open onto the space.
• The Nationally Described Space Standard sets minimum bedroom floor areas for new homes, which is a useful reference for how much room a double bedroom actually has.

The six standard sizes and what they are called

The small single, sometimes called a cot bed size or a narrow single, measures 75cm x 190cm (2ft 6in x 6ft 3in). It exists for box rooms and for children moving out of a cot, and it is genuinely useful in the smallest British bedrooms where a standard single leaves no floor.

The single at 90cm x 190cm (3ft x 6ft 3in) is the everyday British single and the size around which bunk beds, guest rooms and most children’s furniture is designed. Almost all standard single bedding fits it without thought.

The small double at 120cm x 190cm (4ft x 6ft 3in) is the size that causes the most confusion, partly because it goes by several names including three quarter and four foot. It is a sensible compromise for a single adult who wants more room, or for a couple in a genuinely small bedroom, but bedding for it is harder to find than for the sizes either side.

The double at 135cm x 190cm (4ft 6in x 6ft 3in) is the default British couple’s bed. Its dimensions explain a common complaint: shared between two people it gives each sleeper 67.5cm, which is less width than a single bed provides one person.

The king at 150cm x 200cm (5ft x 6ft 6in) adds 15cm of width and, importantly, 10cm of length. That extra length matters for anyone over about six feet, and it is the reason a king is often the right answer even where the width is not needed.

The super king at 180cm x 200cm (6ft x 6ft 6in) gives each of two sleepers 90cm, the same width as a full single bed. It is a large object in a British bedroom and needs the floor area to match, but for sleep quality in a shared bed nothing else in the standard range compares. The fabric, leather and timber options across our modern beds UK range all follow these same six sizes.

Why the frame, not the mattress, decides the fit

Bed sizes describe the mattress. The frame is always larger, and by a variable amount depending on its construction. A slim metal frame might add 5cm in each direction. An upholstered bed with a padded surround can add 15cm or more, and a bed with a substantial wooden footboard adds length at one end.

Headboards add nothing to the floor plan but a great deal to the wall requirement, and a tall upholstered headboard needs clearance from a window sill, a radiator or a sloping ceiling. Storage beds add a further consideration: a side opening drawer needs clear floor beside the bed equal to its own depth, typically 50cm to 60cm, and an ottoman lift needs the ceiling height to raise the base.

This is why we always advise measuring the external frame dimension from the product specification rather than assuming mattress size plus a little. Two king beds can differ by 20cm in overall width, which is the difference between a bedroom that works and one where a door will not open. Our king size fabric beds UK listings quote external dimensions for exactly this reason.

Caption: standard UK bed sizes with the minimum room dimensions we recommend once access and bedmaking clearance are included.

How British bedrooms constrain the choice

The minimum room dimensions above assume the bed can be placed with its head against a wall and accessed from both sides. In practice many British bedrooms cannot offer that. Chimney breasts remove the centre of the most obvious wall, box rooms over stairwells have a bulkhead in one corner, and bay windows consume the wall that looks most promising.

The Nationally Described Space Standard sets minimum floor areas for bedrooms in new homes, distinguishing single and double occupancy, and it is a useful reference point for understanding what a modern double bedroom is designed to hold. Older housing was not built to it, and box rooms in Victorian and interwar terraces are routinely smaller than that benchmark.

Where both sides cannot be kept clear, a bed pushed against one wall works but changes the household’s routine: making the bed becomes a two stage job and the person sleeping inside has to climb across. We would rather see a smaller bed with proper access than a larger one wedged in, because the larger bed makes the whole room harder to use.

Wardrobe doors are the other common collision. A hinged wardrobe door needs its own leaf depth of clear floor, which is frequently the same strip the bed is occupying. Sliding doors remove that problem entirely and are often what makes a king possible in a room that would otherwise take a double.

Bedding, mattresses and the European size trap

UK bedding is cut to UK mattress sizes, and this is where imported furniture causes trouble. European standard sizes are close to British ones without matching them, so a mattress bought for a continental frame may leave a gap at the foot or overhang the sides of a UK bed. Fitted sheets are the first thing to reveal the mismatch.

Mattress depth is a separate variable that no size name covers. Depths in the British market range widely, and deep mattresses need deeper fitted sheets and change the effective height of the bed. On a divan or a high frame, a deep mattress can put the sleeping surface uncomfortably high for a shorter person to get into.

When replacing a mattress in an existing frame, measure the internal frame opening rather than relying on the size the bed was sold as, particularly with older or imported beds. Our modern mattresses UK range follows the standard British sizes, but any frame of uncertain origin deserves a tape measure before ordering.

What this means for UK homes

Start with clearance, not with the bed. Draw the room, mark 60cm on every access side and 75cm where wardrobes or drawers open, and see what rectangle is left. The bed that fits that rectangle, measured as a frame rather than a mattress, is your answer.

Prioritise length over width if anyone in the household is tall. The jump from 190cm to 200cm happens at king size, and for a taller sleeper that extra 10cm does more for comfort than any amount of additional width.

Think about what has to fit alongside. A bed that leaves no room for a bedside surface forces phones, glasses and lamps onto the floor. Slim modern bedside cabinets UK at 35cm to 40cm wide can preserve that function in a room where a full sized pair will not go.

Finally, check the delivery route before ordering, particularly for super king frames and for beds with one piece side rails. A bed base that cannot turn on a half landing is a problem no amount of room measurement will solve.

Methodology

This 2026 guide was compiled by our editorial team from the standard UK bed and mattress sizes recognised by the National Bed Federation, the bedroom floor area benchmarks in the Nationally Described Space Standard, and our assessment as a UK furniture retailer of bed frame dimensions and the clearances required for access and bedmaking. The minimum room dimensions given are our recommendations based on those clearances rather than regulatory requirements or measured survey results. The guide contains no proprietary sales data, no customer data and no survey fieldwork.

Citing this report

Journalists, publications and websites are welcome to cite this guide with credit to Furniture in Fashion and a link back to the source page. It sets out the standard British bed sizes and our sizing recommendations as at 2026. We are glad to clarify any of the measurements for anyone working on related coverage. The full range is at Furniture in Fashion.

Frequently asked questions

What are the standard UK bed sizes?

Small single 75cm x 190cm, single 90cm x 190cm, small double 120cm x 190cm, double 135cm x 190cm, king 150cm x 200cm and super king 180cm x 200cm.

Is a UK king size bed the same as a European king?

No. Continental sizes are close to British ones but not identical, which is why imported mattresses and bedding often fit poorly on UK frames. Always check the stated dimensions in centimetres.

How much space do you need around a bed?

We recommend at least 60cm on any side used for access, and 75cm where a wardrobe door or a chest of drawers opens onto that space.

What is a small double bed?

A small double, also called a three quarter or four foot bed, measures 120cm x 190cm. It suits a single adult wanting more room, or a couple in a small bedroom, though bedding choice is narrower.

Should I choose a king for the width or the length?

Often the length. King and super king are 200cm long against 190cm for every smaller size, and for anyone over about six feet that is the more valuable difference.