The main UK mattress sizes are single (90 x 190cm), small double (120 x 190cm), double (135 x 190cm), king (150 x 200cm) and super king (180 x 200cm). Sizes are written width first, then length. Children's and European sizes sit around those, from a 70 x 140cm toddler mattress up.
The chart below gives every size in centimetres, feet and inches. These are mattress sizes, and a bed frame is always a little bigger than the mattress it holds. For the frames, see our UK bed sizes guide.
On this page
UK mattress size chart
| Size | Centimetres | Feet and inches | Also called |
|---|---|---|---|
| Toddler or cot bed | 70 x 140cm | 2ft 3in x 4ft 7in | Cot bed size |
| Shorty | 75 x 175cm (some junior beds take 70 x 160cm) | 2ft 6in x 5ft 9in | Short single |
| Small single | 75 x 190cm | 2ft 6in x 6ft 3in | 2ft 6 |
| Single | 90 x 190cm | 3ft x 6ft 3in | 3ft |
| European single | 90 x 200cm | 3ft x 6ft 6in | Continental single |
| Small double | 120 x 190cm | 4ft x 6ft 3in | 4ft, three-quarter |
| European small double | 120 x 200cm | 4ft x 6ft 6in | Continental small double |
| Double | 135 x 190cm | 4ft 6in x 6ft 3in | 4ft 6 |
| European double | 140 x 200cm | 4ft 7in x 6ft 6in | Continental double |
| King | 150 x 200cm | 5ft x 6ft 6in | 5ft |
| Super king | 180 x 200cm | 6ft x 6ft 6in | 6ft |
The width and length have to match your bed. Depth is a separate choice, covered further down.
No queen on the list? Queen isn't a standard UK size. UK retailers who use the name usually mean a small double, 120 x 190cm, and the National Bed Federation's consumer guide gives it as another name for that size. An American queen is a different mattress: 152 x 203cm (60 x 80 inches), slightly bigger than a UK king.
The frame is bigger than the mattress. A mattress size is the space inside the frame. The frame adds legs, a headboard and a foot end around it. As a double, our Nami White and Grey Wooden Bed is 145cm wide and 198cm long: 10cm wider and 8cm longer than its 135 x 190cm mattress.
Storage frames can add more. The Solis Ottoman Wooden Bed is 150.5cm wide and 210cm long as a double. See all ottoman beds, and measure your room against the frame size on the product page.
Toddler, shorty and small single mattresses
- Toddler or cot bed: 70 x 140cm. The size for toddler beds and cot beds. You'll find ours with the kids' mattresses, and the frames are in toddler beds. Our toddler bed size guide covers frame sizes.
- Shorty: 75 x 175cm. The common UK shorty size, 15cm shorter and 15cm narrower than a single. If your bed takes it, see our shorty mattresses. Not every short bed does. Our shorty beds take a 70 x 160cm mattress, and the size is on each product page.
- Small single: 75 x 190cm. The full length of a single but 15cm narrower, for compact frames and some trundles. See small single mattresses.
Our kids' bed size guide explains when to move up a size, and the kids' mattress guide helps you choose one.
Single mattress size
A UK single mattress is 90 x 190cm, or 3ft x 6ft 3in. It's the standard size for one sleeper, and the size most bunk beds and day beds take. The frame is wider than 90cm: the Nami is 98cm wide and 198cm long as a single.
Browse single mattresses and single beds, or read our single bed size guide.
Small double mattress size
A small double mattress is 120 x 190cm, or 4ft x 6ft 3in. You'll also see it called a 4ft or three-quarter mattress. It's 30cm wider than a single and 15cm narrower than a double, so it's roomy for one and snug for two, at 60cm each.
Browse small double mattresses and small double beds, or read our small double bed size guide.
Double mattress size
A UK double mattress is 135 x 190cm, or 4ft 6in x 6ft 3in. Shared by two, that's 67.5cm each, which is less than a single bed each.
Browse double mattresses and double beds, or read our double bed size guide.
King size mattress size
A UK king size mattress is 150 x 200cm, or 5ft x 6ft 6in. It's 15cm wider and 10cm longer than a double, so it's the first of the main UK sizes with extra length for taller sleepers. Two people get 75cm each.
Browse king size mattresses and king size beds, or read our king size bed dimensions guide.
Super king mattress size
A UK super king mattress is 180 x 200cm, or 6ft x 6ft 6in. It's 30cm wider than a king and the same length, so two people get 90cm each, the width of a single.
The frame needs a big room. Our Briarwick Oak Panel Bed Frame is 192cm wide and 213.5cm long as a super king. Browse super king mattresses and super king beds.
European mattress sizes
European sizes, also called continental sizes, are 200cm long where the matching UK size is 190cm. They're common on beds made in Europe. A 200cm frame needs a 200cm mattress, because a UK one leaves a 10cm gap at the end.
- European single: 90 x 200cm. See European single mattresses and European single beds.
- European small double: 120 x 200cm. See European small double mattresses.
- European double: 140 x 200cm. 5cm wider and 10cm longer than a UK double. See European double mattresses.
If the inside of your frame measures 90, 120 or 140cm wide and 200cm long, it's a European size.
Mattress depth: comfort and fit
Depth doesn't change the size you need. A double is 135 x 190cm whether it's 15cm or 28cm deep. It does change how the bed feels and fits.
A deeper mattress has more inside. There's room for a taller spring unit and thicker comfort layers. Our PocketBalance Mattress is 23cm deep with 1000 pocket springs, and the NaturalLoft Mattress is 28cm deep with 1500.
- Height. A deep mattress raises the height you sit and sleep at, and covers more of the headboard.
- Bedding. Choose fitted sheets with a pocket deeper than the mattress.
- Trundles. A pull-out bed needs a slim mattress so it can slide back under. The TrundleEase 10 Mattress is 10cm deep.
- Bunk beds and raised beds. These are the exception, because depth isn't a free choice there. Read our bunk bed mattress guide before you buy, and see our bunk bed mattresses.
Once you know the size, choose the type: pocket sprung, memory foam or hybrid. A mattress protector keeps it fresh, and our guide to how often to change your mattress covers when to replace it.
Common questions
What size is a single mattress?
90 x 190cm, or 3ft x 6ft 3in.
What size is a small double mattress?
120 x 190cm, or 4ft x 6ft 3in. It's also called a 4ft or three-quarter mattress.
What size is a double mattress?
135 x 190cm, or 4ft 6in x 6ft 3in.
What size is a king size mattress?
150 x 200cm, or 5ft x 6ft 6in. That's 15cm wider and 10cm longer than a double.
Is queen a UK mattress size?
Not a standard one. In the UK the name usually means a small double, 120 x 190cm. An American queen is 152 x 203cm.
Is a mattress the same size as the bed?
The mattress matches the space inside the frame. The frame is bigger, so measure your room against the frame size on the product page.
Will a UK mattress fit a European bed?
Not properly. A UK single, small double or double is 190cm long, so it leaves a 10cm gap in a 200cm European frame.
How do I find out which size I need?
Check the bed's product page or instructions. If you can't, measure the inside of the frame, width then length, and match it to the chart.