Small double bed size: standard dimensions, mattress and room space

Wider than a single, narrower than a double: the small double is the in-between bed for people who sleep alone and like room to stretch out. Here is what it actually measures in the UK and in continental Europe, which mattress it takes and how much floor space it needs.

A UK small double bed is 4ft by 6ft 3in, which is 120 x 190 cm, according to the size guide of the National Bed Federation, the trade body for British and Irish bed makers. In continental Europe the same width usually comes with a 200 cm length, so you will also see 120 x 200 cm, particularly from European brands. Those figures describe the mattress and base; the frame always adds a few centimetres.

This guide covers the small double only: how it compares with the sizes either side of it, who it suits, the difference between mattress size and real footprint, and the bedding to look for. Our size guides for singles and doubles are linked further down.

What size is a small double bed?

A small double bed in the UK measures 120 x 190 cm, or 4ft x 6ft 3in. That is the figure in the bed size table published by the National Bed Federation on its consumer site, Bed Advice UK, which also notes that the size is sold as a “three quarter” and sometimes as a “queen”. The federation’s practical advice is not to go by names alone, because one shop’s size label may not match another’s: compare the actual dimensions, in the same units.

On the Continent the width is the same but the standard length is 200 cm. In Italy the size is called una piazza e mezza, literally “one and a half places”, and makers such as Magniflex list it as 120 x 190, 120 x 195 and 120 x 200 cm. As the Wikipedia overview of bed sizes notes, IKEA, whose mattresses are typically 200 cm long, has sold British sizes alongside European ones in the UK since 2015, so a 120 x 200 cm mattress and a 120 x 190 cm frame are not interchangeable even if both are labelled “small double”.

Source: National Bed Federation, Bed Advice UK.

Should you choose 190 or 200 cm long?

Go by the tallest person who will use the bed. The National Bed Federation recommends a bed at least 10 cm longer than that person, and suggests that anyone over 180 cm should consider a 200 cm length. In practice, up to about 180 cm tall the British 120 x 190 cm is enough; above that, a European 120 x 200 cm frame and mattress are worth the extra 10 cm of floor.

How does a small double compare with a single, a double and a French-style bed?

The difference is all in the width, because single, small double and double share the same 190 cm UK length. A small double gives you 30 cm more than a standard single, which is enough to turn over without meeting the edge. A UK double adds another 15 cm. If you are deciding between a wide single and a small double, our guide to single bed sizes covers the 90 and 100 cm options.

In southern Europe the next step up is often the 140 cm French-style double, which we explain in our article on the French-style double bed and its dimensions. Do not mix up the names when shopping abroad: a 140 cm bed is sometimes described in Italy as a “French one and a half”, while a true small double is always 120 cm wide.

Who is a small double bed right for?

It suits one person who wants more space than a single. Manufacturers describe it in exactly those terms: the French brand Bultex calls the 120 x 190 cm an extra-wide one-person bed for adults and older teenagers of any build, and the Spanish maker Pikolin recommends it for guest rooms and teenagers’ bedrooms.

• Single adults who move a lot at night or like to read in bed.
• Teenagers, for whom a 120 cm bed lasts well beyond the growth spurt.
• Guest rooms, where it sleeps one comfortably and two for the odd night.

For two people every night, 120 cm is tight. The National Bed Federation suggests the small double only as an occasional bed for two, and points out that even a standard double gives each sleeper just 2ft 3in. Its test is simple: lie side by side on your backs with your hands behind your heads and elbows out. If your elbows do not touch, you have enough room.

How much floor space does a small double need?

More than 120 cm, always. The mattress size is only the starting point: side rails, upholstered sides and a headboard add width and length, and how much depends entirely on the model. A slim metal frame stays close to the mattress size, while an upholstered bed with a tall headboard can grow noticeably. Read the “overall dimensions” on the product sheet, not the mattress size. We walk through the method in our guide to the overall dimensions of a 90×200 bed frame, and it works the same for a 120 cm bed.

A worked example, not a standard: imagine a bed with overall dimensions of 135 x 215 cm in a room 300 cm wide, pushed against one wall. That leaves 165 cm on the other side. If a 60 cm deep wardrobe stands there, you have 105 cm between bed and wardrobe doors, still to be checked against the swing of the doors and drawers. With a UK double that is 15 cm wider, the gap drops to 90 cm.

A useful reference for seeing how frames change the final size is the catalogue of Arredare Moderno, which has a section of Italian small double beds, including storage models: comparing two or three product sheets of the same size shows how much the frame adds.

What mattress and bedding do you need?

You need a mattress exactly the size of the base. A shorter mattress leaves a gap at the foot, a longer one overhangs, and a 120 x 200 cm European mattress will not sit properly on a 120 x 190 cm British frame. If the bed has storage, check the maximum mattress depth the maker recommends, as it affects how the lid closes and how the headboard looks.

For bedding, buy small double sizes, especially for the fitted sheet. A double fitted sheet is made for a 135 cm mattress and will not stay taut on a 120 cm one. If your mattress is a continental 120 x 200 cm, check that the fitted sheet states a 200 cm length rather than assuming the British 190 cm.

Frequently asked questions

Is a small double the same as a three quarter bed?

Yes. In the UK the two names describe the same 4ft x 6ft 3in size.

Can two adults sleep in a small double?

For the occasional night, yes. As an everyday bed for a couple, a double or king is more comfortable.

Is a small double the same as an Italian “piazza e mezza”?

The width is the same, 120 cm. Italian makers sell it in 190, 195 and 200 cm lengths, so check the length before mixing frames, mattresses and sheets.

Before ordering, measure the wall the bed will stand against, choose the length by the tallest sleeper, read the overall dimensions of the frame and match the bedding to the exact mattress size. For couples, our guide to how big a double bed is covers the next sizes up.

Sources

• National Bed Federation, Bed Advice UK, “Bed sizes: UK bed and mattress size guide” and FAQs (bedadvice.co.uk)
• Magniflex, MagniStretch mattress product page and size guide (magniflex.com), October 2026
• Bultex, “Matelas 120×190” page (bultex.fr)
• Pikolin, “Colchones de 120×190 cm” page (pikolin.com)
• Wikipedia, “Bed size” (on IKEA lengths and UK sizes since 2015)