Small single, ¾, day bed, bunk and sofa bed sizes

These are the sizes that catch people out when ordering a replacement mattress or sheets.

Checked against UK retailer and maker guides on 21 October 2026.

Name	Size	Notes
Small single (2ft 6in)	75 × 190 cm	15 cm narrower than a single, same length (Which?)
IKEA small single	80 × 200 cm	IKEA day beds and extendable children’s beds
¾ / small double / “queen”	120 × 190 cm	Dunelm calls it a “¾ double” and says it is common in university accommodation
Bunk and loft beds (IKEA)	90 × 200 cm	Some IKEA mattresses are excluded from top bunks because of height limits
Sofa beds (IKEA)	140 × 200 cm	Other makers vary: measure the sofa bed’s mattress
Cot bed	140 × 70 cm	MattressNextDay; see KidsSizes for children’s sleep

¾ bed size

A “three-quarter” bed is the same as a small double: 4ft wide, 120 × 190 cm (MyBedFrames, Dunelm). Dunelm sells small double sheets to fit 120 × 190 cm and a small double duvet of 175 × 200 cm.

Bunk beds

Bunk mattresses are often not a standard UK single. IKEA’s bunk and loft beds take 90 × 200 cm, which is 10 cm longer than a UK single. IKEA also excludes some of its mattresses from loft beds and top bunks because of height restrictions, so check the bed maker’s maximum mattress depth before buying a deeper one.

Day beds and sofa beds

IKEA’s day beds use two 80 × 200 cm mattresses and pull out to a double 160 cm wide. Sofa bed mattresses vary by model; IKEA’s are 140 × 200 cm. Measure the mattress you have in centimetres and order bedding to match.

For children’s bed, duvet and bedtime sizes by age, see KidsSizes.

Questions

What size is a 3/4 bed?

120 × 190 cm, also called a small double (4ft).

What size is a small single mattress?

75 × 190 cm (2ft 6in × 6ft 3in) at most UK shops. IKEA’s “small single” is 80 × 200 cm.

Where these numbers come from

Checked 21 October 2026. Makers round sizes differently, so always check the dimensions on the product you're buying.