What Are the Standard UK Mattress Sizes?

Mattresses in the UK are manufactured in a range of standard sizes designed to suit different sleeping arrangements and bedroom layouts. Choosing the right mattress size can make a significant difference to sleep comfort, particularly for couples or sleepers who prefer more room to move during the night.

Understanding the dimensions of standard UK mattress sizes can help you choose a bed that fits comfortably in your bedroom while providing enough sleeping space.

In this guide, our sleep experts explain the most common UK mattress sizes and how they compare.

Standard UK Mattress Size Guide

The UK has six commonly recognised mattress sizes, each designed for different bedroom spaces and sleeping needs.

Mattress Size
Dimensions (cm)
Dimensions (ft & in)

Small Single
75 x 190 cm
2 ft 6 in x 6 ft 3 in

Single
90 x 190 cm
3 ft x 6 ft 3 in

Small Double
120 x 190 cm
4 ft x 6 ft 3 in

Double
135 x 190 cm
4 ft 6 in x 6 ft 3 in

King Size
150 x 200 cm
5 ft x 6 ft 6 in

Super King Size
180 x 200 cm
6 ft x 6 ft 6 in

These mattress sizes are designed to fit most UK bed frames and bases.

Small Single Mattress

A small single mattress measures 75 x 190 cm and is one of the most compact mattress sizes available.

Small single mattresses are commonly used for:

Children's bedrooms
Smaller guest rooms
Beds designed for compact spaces

Because of their narrow width, they are typically suited to single sleepers.

Single Mattress

A single mattress measures 90 x 190 cm and is one of the most common mattress sizes in the UK.

Single mattresses are often used for:

Children and teenagers
Single adult sleepers
Guest bedrooms

They provide more sleeping space than a small single while still fitting comfortably in smaller rooms

Small Double Mattress

A small double mattress measures 120 x 190 cm and is sometimes referred to as a three-quarter mattress.

Small double mattresses are commonly chosen for:

Single sleepers who want more space
Smaller bedrooms where a full double bed may not fit

They can occasionally accommodate two sleepers but provide less space than a standard double mattress.

Double Mattress

A double mattress measures 135 x 190 cm and is one of the most popular mattress sizes for couples in the UK.

Double mattresses are commonly used for:

Couples in standard-sized bedrooms
Single sleepers who prefer extra sleeping space

They provide a comfortable balance between sleeping space and bedroom practicality.

King Size Mattress

A king size mattress measures 150 x 200 cm and offers more width and length than a standard double mattress.

King size mattresses are often chosen by:

Couples who want more personal sleeping space
Taller sleepers who benefit from additional mattress length

The extra space can make a noticeable difference to overall sleep comfort.

Super King Size Mattress

A super king mattress measures 180 x 200 cm, making it the largest standard mattress size available in the UK.

Super king mattresses are ideal for:

Couples who prefer maximum sleeping space
Larger bedrooms that can accommodate bigger beds
Sleepers who move frequently during the night

Because of the generous dimensions, super king mattresses provide a spacious sleeping surface.

How to Choose the Right Mattress Size

The best mattress size for your home will depend on several factors.

These include:

The size of your bedroom
How many people will use the bed
How much personal sleeping space you prefer
The size of your bed frame

Allowing enough space around the bed for movement and furniture is also an important consideration when selecting a mattress size.

Expert Advice from Land of Beds

Choosing the right mattress size can improve both sleep comfort and the overall layout of your bedroom. Larger mattresses provide more sleeping space, while smaller mattresses may be better suited to compact rooms or guest spaces.

Our experts recommend considering both your available bedroom space and your personal comfort preferences before choosing a mattress size.

Selecting a mattress that suits your room and sleeping needs can help create a comfortable and practical sleep environment.

Summary

Standard UK mattress sizes range from compact small single mattresses to spacious super king models designed for larger bedrooms. Each mattress size offers different benefits depending on the available bedroom space and the number of sleepers using the bed.

Understanding these standard mattress sizes can help you make a more informed decision when choosing a bed that suits both your room and your sleep preferences.

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