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Small double beds and mattresses measure 120cm wide by 190cm long, which is roughly 4 feet wide by 6 feet 3 inches long. Also known as a queen size in the UK, this size offers more width than a single without taking up as much space as a full double.
It is ideal for one person who likes extra room or for couples with limited bedroom space.
Best for: solo adults, teenagers, and smaller double bedrooms or guest rooms.
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What size is a single bed and mattress?
Single beds and mattresses measure 90cm wide by 190cm long, which is around 3 feet wide by 6 feet 3 inches long. This is the standard size for one person and is commonly used in children’s rooms, small bedrooms, or for occasional use in guest spaces.
It provides enough space for one adult or child to sleep comfortably without taking up too much room.
Best for: children, teenagers, solo sleepers, or compact bedrooms.
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What size is a small single bed and mattress?
Small single beds and mattresses measure 75cm wide by 190cm long, which is about 2 feet 6 inches wide by 6 feet 3 inches long. This size is narrower than a standard single, making it perfect for rooms where space is limited.
It offers just enough room for one person and is often used for children, bunk beds, or tight guest spaces.
Best for: young children, small bedrooms, box rooms, or bunk beds.
What size is a toddler mattress?
Toddler mattresses in the UK typically measure 70cm wide by 140cm long, which is around 2 feet 3 inches wide by 4 feet 7 inches long. This size is designed to fit toddler beds, which are a step up from a cot and provide a safe, comfortable space for young children as they grow.
Toddler mattresses are low to the ground and easy for little ones to climb in and out of.
Best for: toddlers aged 2 to 4 years transitioning from a cot.
What size is a cot bed mattress?
Cot bed mattresses in the UK usually measure 60cm wide by 120cm long, which is approximately 2 feet wide by 3 feet 11 inches long. This size is designed for use in standard cots or cot beds and provides a snug, supportive sleep space for babies and young infants.
Cot mattresses are firm and safe for newborns, with breathable materials to support healthy sleep.
Best for: babies and infants up to around 2 years old.
What is the standard mattress depth?
Most mattresses in the UK are between 20cm and 30cm deep, which is about 8 to 12 inches. This is the normal depth for everyday comfort and support, and it works well for most people.
Some mattresses are a bit deeper, especially ones with extra layers like memory foam or pillow tops. These can be up to 35cm deep and feel more luxurious. Mattresses for children or guest beds are often thinner, around 15cm to 18cm.
Here’s a quick guide:
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20–25cm – great for regular use and everyday comfort
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25–30cm – offers more support and a softer feel
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Over 30cm – usually high-end mattresses with lots of layers
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Under 20cm – best for kids’ beds, bunk beds, or spare rooms
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Best for: babies and infants up to around 2 years old.
What is the difference between UK and European bed sizes?
The main difference between UK and European bed sizes is the width and length of the mattress. European beds are often slightly longer and sometimes wider than their UK equivalents. This can cause confusion when shopping for a bed frame and mattress, especially if they’re bought from different places.
For example:
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A UK double mattress is 135cm wide by 190cm long
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A European double mattress is 140cm wide by 200cm long
That means the European version is 5cm wider and 10cm longer than the UK one. This size mismatch means a UK mattress won’t fit properly in a European bed frame, and vice versa.
Here’s a quick comparison:
| Size Name | UK Mattress Size (cm) | European Mattress Size (cm) | Notes |
|---|---|---|---|
| Single | 90 x 190 | 90 x 200 | EU single is 10cm longer |
| Double | 135 x 190 | 140 x 200 | EU double is 5cm wider and 10cm longer |
| King | 150 x 200 | 160 x 200 | EU king is 10cm wider |
| Super King | 180 x 200 | 180 x 200 | Same size in both |
Always double-check if your bed frame and mattress follow UK or European sizing before buying. Even small differences in length or width can affect fit and comfort.
