A UK double bed is 54 inches wide by 75 inches long, which converts to 135cm by 190cm. It is often referred to as a 4ft 6in bed, because 54 inches is exactly four and a half feet. That is the standard double size sold across British retailers, and the size all UK double bedding is cut to fit.
The imperial and metric figures do not convert to neat round numbers in either direction, which is why you sometimes see a double described as 53in or 75.5in. The specification to work from is 135cm by 190cm, with 54in by 75in as the practical inch equivalent.
British bed sizing shifted to centimetres decades ago, but inches persist for a few good reasons. Older houses were built to imperial measurements, so alcoves, chimney breasts and box rooms often work out to round numbers in feet rather than centimetres. Many older beds and frames still in use were made to imperial sizes.
Tape measures in most UK households show both, and tradespeople frequently work in feet and inches when discussing rooms. So knowing that a double is 4ft 6in is genuinely useful when you are standing in a bedroom trying to work out whether it will fit.
A single is 36in by 75in, or 90cm by 190cm, and is often called a 3ft bed. A small double is 48in by 75in, or 120cm by 190cm, known as a 4ft bed. A double is 54in by 75in, or 135cm by 190cm, the 4ft 6in size. A king is 60in by 78in, or 150cm by 200cm, the 5ft size. A super king is 72in by 78in, or 180cm by 200cm, the 6ft size.
The length pattern is worth noting: single, small double and double are all 75in long, while king and super king are 78in. So the step from a double to a king adds 6in of width and 3in of length.
Per sleeper, a double gives two people 27in each. A standard single is 36in wide, so each person in a double has 9in less width than they would in a single bed. That single figure explains most of the comfort complaints couples have about double beds.
Mattress depth varies far more than the other two dimensions and is the one people forget. Pocket sprung and hybrid mattresses commonly run from 10in to 13in deep, while slimmer foam mattresses can be closer to 7in or 8in. Depth determines whether your fitted sheets will stay on, since most are cut for a pocket around 12in.
Frame dimensions differ from mattress dimensions too. A slim wooden frame might add 2in per side, while a padded upholstered bed can add 4in or more. Headboards add to the length: a tall floor standing board can push a 75in bed beyond 82in overall. Always plan around the external frame measurements listed in the specification, and you can compare footprints across our modern double beds UK sale range.
Allow 24in of clear floor on any side you walk along, and closer to 30in where a wardrobe door or a drawer front needs to open in front of you. A 54in mattress in a frame finishing around 60in wide therefore wants a room roughly 108in, or 9ft, across for access on both sides.
Plenty of British second bedrooms sit below that. In those rooms, placing the bed against one wall is a reasonable compromise. It makes bedding changes harder and one person has to climb out, but it frees a usable walkway and floor for furniture.
Mark the footprint on the floor before ordering. Tape out 60in by 82in for a typical double frame with a headboard, then walk the room, open the wardrobe and swing the door. Numbers on paper hide the awkwardness that tape on the floor reveals immediately.
A UK double fitted sheet is cut for 54in by 75in plus a depth pocket. A double duvet is around 78in by 78in, deliberately much wider than the mattress so it drapes over both sides. A double flat sheet is usually around 90in by 100in.
Pillows are where the numbers stop lining up. A standard UK pillow is 29in by 19in, so two side by side total 58in, which is 4in wider than a 54in mattress. That slight overhang is normal on a double and is why pillows on a double bed tend to sit slightly angled rather than perfectly flat against a headboard.
If you are buying bedding from overseas listings, always check the inch or centimetre measurements rather than the size name. A US full or double is 54in by 75in, which happens to match, but US queen and king sizes differ considerably from UK equivalents.
Once the size is settled, the interior is the decision that affects your sleep. Pocket sprung mattresses respond individually across the surface, so movement transfers less between two sleepers. Memory foam contours closely and retains warmth. Hybrids combine springs with a foam or latex comfort layer.
Firmness is personal rather than absolute. Side sleepers usually want more give at the shoulder and hip. Back and front sleepers generally prefer a firmer surface that keeps the spine level. Two people of very different weights sharing a double is the hardest case to solve, and it is one of the clearer arguments for sizing up to a king if the room allows.
Buy the base and mattress together where you can. Slat spacing, ventilation and edge support all influence performance and longevity. If storage is short in the room, an ottoman base gives access to the full 54in by 75in footprint beneath the mattress, and pairing it with slim furniture from our modern chest of drawers UK sale range keeps walkways clear. You will find frames, bases and the rest of the bedroom ranges together at Furniture in Fashion UK.
A 75in mattress cannot be folded, so it has to travel the full route in one piece. Measure the stair width, the landing turn and the bedroom doorway, and check the diagonal clearance on any tight corner. Rolled and vacuum packed mattresses avoid the problem entirely, and most frames arrive flat packed.
Headboards are usually the awkward component on upholstered beds, since many arrive as one solid piece. Check its dimensions separately rather than assuming the frame measurements cover it.
Most confusion over bed sizes comes from converting between inches and centimetres and rounding at the wrong point. A UK double is 54in by 75in, which converts to 137cm by 191cm, yet it is almost always sold as 135cm by 190cm. Both describe the same bed, and the difference is rounding rather than an actual variation in the product.
The practical rule is to compare like with like. Check the frame and the mattress in the same unit, taken from the same retailer if possible, and treat differences of a centimetre or two as rounding rather than incompatibility. Differences of five centimetres or more are real, and usually mean you are looking at a size from another market.
Older UK homes and older beds are where inch measurements matter most. Bedrooms in Victorian and interwar houses were built to imperial dimensions, so chimney breasts, alcoves and door widths often work out to neat figures in feet and inches and awkward ones in centimetres. Measuring an alcove in inches sometimes makes it immediately obvious whether a 54in bed will fit, when the metric figure looked marginal.
Second hand frames are the other case. A frame from the 1960s or 1970s may have been built to 4ft 6in internally with no allowance for a modern mattress, so always measure the internal rails rather than trusting the size on the listing. A mattress is an expensive thing to order for a frame it does not fit, so take the internal measurement first and then compare it against the range of modern mattresses UK sale.
A mattress topper adds two to four inches of height, which changes nothing about the width and length but does affect fitted sheets. A standard double fitted sheet with a 10in depth will not stretch over a 12in mattress plus a 3in topper. Check the pocket depth in inches alongside the bed size, because it is the measurement most often left off a product description and the one most likely to cause a sheet to ping off a corner in the night.
A UK double is 54in wide by 75in long, equal to 135cm by 190cm. It is commonly called a 4ft 6in bed.
Yes, in mattress size. A US full or double is also 54in by 75in, though bedding cuts and depth pockets can differ.
About 27in each, which is 9in less per person than a standard 36in single bed.
A double duvet at roughly 78in by 78in. It is intentionally wider than the mattress so it drapes over both sides.
Around 9ft wide for walking space on both sides. Smaller rooms will still take the bed with one side against a wall.
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