Vesgantti Classic Box Top Single
A practical mattress (hybrid, medium-firm feel, 26cm deep), best judged against your sleeping position, body weight and the current price.
UK Mattress Sizes and Dimensions (Full Guide)
UK mattress sizes follow standard dimensions, but the names can be confusing and they differ from European and US sizes. This guide lists every standard UK mattress size in both centimetres and inches, so you can check what fits your bed and your room.
Quick 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 / 4ft6), King (150 x 200 cm / 5ft) and Super King (180 x 200 cm / 6ft). A double is 135 cm wide; a king is both wider and longer.
Every UK mattress size
- Small Single - 75 x 190 cm (2ft6)
- Single - 90 x 190 cm (3ft)
- Small Double - 120 x 190 cm (4ft)
- Double - 135 x 190 cm (4ft6)
- King - 150 x 200 cm (5ft)
- Super King - 180 x 200 cm (6ft)
European and US sizes differ, so check the exact centimetres if you're buying from an overseas brand or ordering fitted sheets.
How to choose the right size
Match the mattress to both the sleeper and the room. A double (135 cm) suits one adult who likes space, or a couple who don't mind being cosy; a king (150 cm) gives a couple more room; a super king (180 cm) is the most spacious if your bedroom fits it. Leave at least 60 cm around the bed to move comfortably, and measure doorways and stairs for delivery.
Depth and fitted sheets
Mattress depth isn't standardised - it ranges from around 18 cm to 30 cm or more. Deep mattresses need deep-fitted sheets, so check the sheet's 'wall' depth. Depth changes the comfort layers, not the length and width, so a 'double' is always 135 x 190 cm however thick it is.
Our top picks
#1
#2 
Vesgantti Hybrid Memory Foam
A practical mattress (hybrid, medium-firm feel), best judged against your sleeping position, body weight and the current price.
#3
Vesgantti Classic Box Top Small Double
A practical mattress (hybrid, medium-firm feel, 26cm deep), best judged against your sleeping position, body weight and the current price.
Frequently asked questions
What size is a UK double mattress?
A standard UK double is 135 x 190 cm, or 4ft6 x 6ft3. It's wider than a small double (120 cm) but narrower and shorter than a king (150 x 200 cm).
Is a UK king the same as a US king?
No. A UK king is 150 x 200 cm, while a US (Eastern) king is roughly 193 x 203 cm - closer to a UK super king. Always check the centimetres when buying from a US brand.
What's the difference between a double and a small double?
A small double is 120 cm wide; a standard double is 135 cm. The small double suits a single adult wanting more room or a compact guest room; the double suits couples.
Bottom line
Our top pick is the Vesgantti Classic Box Top Single (our score 9.6/10) - A practical mattress (hybrid, medium-firm feel, 26cm deep), best judged against your sleeping position, body weight and the current price..