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Trade guide

UK bed and mattress sizes for trade buyers

By the Flair Trade team · Last reviewed 30 October 2026

Short answer: The main UK mattress sizes are single 90 x 190 cm (3ft), small double 120 x 190 cm (4ft), double 135 x 190 cm (4ft 6in), king 150 x 200 cm (5ft) and super king 180 x 200 cm (6ft). Continental (EU) sizes are longer at 200 cm and use different widths, so a continental mattress will not fit a UK bed. Always match the mattress size named on the bed product page.

Key facts

  • UK and continental sizes are not interchangeable.
  • Flair product names state the size, for example "Single" or "Single Continental".
  • Shorty mattresses (75 x 175 cm) suit some kids' beds and bunks.
  • Bunks and high sleepers also have a maximum mattress thickness.

UK size chart

SizeWidth x length (cm)ImperialTypical use
Shorty75 x 1752ft 6in x 5ft 9inKids' beds, some bunks
Small single75 x 1902ft 6in x 6ft 3inSmall rooms, kids
Single90 x 1903ft x 6ft 3inKids, students, twin rooms
Small double120 x 1904ft x 6ft 3inSingle adults, students, small doubles
Double135 x 1904ft 6in x 6ft 3inStandard double room
King150 x 2005ft x 6ft 6inLarger doubles, hotels
Super king180 x 2006ft x 6ft 6inSuperior rooms, master bedrooms

Shorty, single and small and standard double dimensions are as listed in Flair product specifications. King and super king are the standard UK sizes; always check the dimensions on each product page, as frame sizes vary.

Continental (EU) sizes on the Flair range

Flair size nameWidth x length (cm)
Single Continental (EU Single)90 x 200
Small Double Continental (EU Small Double)120 x 200
Double Continental (EU Double)check product page

Some Flair kids' beds and Noomi pieces use continental sizes. Each product page names the mattress size it takes, and the stock feed carries a size column so your listings stay matched.

Why size matters in trade

  • Returns: a wrong-size mattress is one of the most avoidable returns. Sell bed and mattress together where you can.
  • Bunk safety: on bunks and high sleepers, the mattress must also be no thicker than the marked maximum. See BS EN 747.
  • Room planning: in HMOs and student rooms, room size limits the bed. See HMO furnishing.
  • Listings: give width, length and depth in cm, plus the UK size name, so marketplace filters work.

Bedding and protectors

Match protectors, toppers and sheets to the mattress size and depth. See toppers, pillows and bedding.

Frequently asked questions

What size is a UK double mattress?

135 x 190 cm, or 4ft 6in x 6ft 3in.

What size is a UK king size mattress?

150 x 200 cm, or 5ft x 6ft 6in. A UK king is narrower than many European king sizes.

What is a small double?

120 x 190 cm (4ft). It is sometimes called a three-quarter bed.

What is a continental single?

90 x 200 cm. It is the same width as a UK single but 10 cm longer, so it needs a continental-size frame.

What is a shorty mattress?

A shorter single, 75 x 175 cm in the Flair range, used on some kids' beds and bunks.

Will a European mattress fit a UK bed?

Usually not. Continental sizes are 200 cm long and use different widths. Match the mattress size named on the bed product page.

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Flair Trade is a trading name of Flair Furniture Ltd, Old Delivery Office, Oldfield Lane, Heckmondwike, West Yorkshire WF16 0JD. Registered in England and Wales, company no. 7536751. VAT no. GB121713455.