Shop All Mattress Sizes

Small Single Mattress Size

A small single mattress measures 75cm wide by 190cm long (2ft 6in × 6ft 3in). It is a compact mattress size that can be useful for children's bedrooms, guest rooms and rooms where floor space is limited. Check that your bed frame is designed for a small single mattress before buying.

Single Mattress Size

A standard UK single mattress measures 90cm wide by 190cm long (3ft × 6ft 3in). A single mattress is designed for one sleeper and is a versatile choice for children's bedrooms, teenagers, guest rooms and adults sleeping alone. It provides more width than a small single while remaining relatively space efficient.

Small Double Mattress Size

A small double mattress measures 120cm wide by 190cm long (4ft × 6ft 3in). Also known as a three-quarter mattress, it provides more sleeping width than a single without taking up as much space as a standard double. It can be useful for one adult who wants extra room or for occasional use by two people.

Double Mattress Size

A standard UK double mattress measures 135cm wide by 190cm long (4ft 6in × 6ft 3in). A double provides more sleeping space than a small double and can accommodate one or two sleepers. It is a popular choice for couples, guest bedrooms and adults who want additional space without moving up to a king size.

King Size Mattress Dimensions

A UK king size mattress measures 150cm wide by 200cm long (5ft × 6ft 6in). It is 15cm wider and 10cm longer than a standard double, providing additional sleeping space for one or two people. The extra length can also be useful for taller sleepers. Make sure your bed frame is designed for a UK king size mattress.

Super King Mattress Dimensions

A UK super king mattress measures 180cm wide by 200cm long (6ft × 6ft 6in). It provides the widest standard UK mattress sleeping surface and is designed for people who want more space to move around or share a bed. A super king requires a suitably sized bed frame and enough bedroom space for the larger footprint.

Small Single vs Single

A single mattress is 15cm wider than a small single, while both are normally 190cm long.

Single vs Small Double

A small double is 30cm wider than a single, while both are normally 190cm long.

Small Double vs Double

A double is 15cm wider than a small double, while both are normally 190cm long.

Double vs King

A king is 15cm wider and 10cm longer than a double.

King vs Super King

A super king is 30cm wider than a king, while both are normally 200cm long.

Which Mattress Size Should I Choose?

The right mattress size depends on who will use it, how much space is available and whether you are replacing an existing mattress or buying a complete bed.

• For one adult: a single, small double or larger mattress can work, depending on the space available and how much room you want to sleep.
• For children or teenagers: a small single or single can be a practical choice, depending on the bed frame and available bedroom space.
• For couples: a double can provide a compact shared sleeping surface, while a king or super king gives you more room to move.
• For guest rooms: consider how much floor space you have and whether the room needs to accommodate other furniture.
• For taller sleepers: a king or super king provides 200cm of mattress length, compared with 190cm for most single, small double and double mattresses.
• For smaller bedrooms: measure the available floor space as well as the mattress, remembering that the bed frame will usually be larger than the mattress itself.

If you already have a bed frame, measure the internal mattress area before ordering and choose a mattress with matching dimensions.

Will a Mattress Fit My Bed?

A mattress should match the intended size of your bed frame. For example, a standard UK double bed requires a standard double mattress measuring approximately 135cm × 190cm, while a king size bed requires a king mattress measuring approximately 150cm × 200cm.

If you are replacing an existing mattress, check the mattress dimensions rather than relying only on the name of the bed. Measure the internal sleeping area of the frame and check the product dimensions before ordering. Bed frames can also have larger external dimensions because of the frame, headboard or footboard.

How Much Bedroom Space Do I Need for a Mattress?

The mattress needs to fit within your bed frame, but you should also leave enough floor space to move around the bed and access doors, drawers and other furniture. A larger mattress therefore needs more than just its own width and length.

Before choosing a mattress size, measure the bedroom and mark out the mattress or bed footprint. If you are buying a complete bed, use the bed frame's external dimensions rather than the mattress dimensions when planning the available space.

Bed & Mattress Sizes FAQs

What is the most common mattress size in the UK?

The most common UK mattress sizes include single, double and king size. A single measures 90cm × 190cm, a double measures 135cm × 190cm and a king measures 150cm × 200cm. The right size depends on the number of sleepers, available bedroom space and the dimensions of your existing bed frame.

What is the difference between a UK and European mattress size?

UK and European mattress dimensions are not always the same, even when the names are similar. European mattresses can have different widths and lengths from standard UK sizes. If you are replacing a mattress on an imported or European bed frame, check the exact internal dimensions before ordering rather than relying on the mattress name alone.

Does mattress size affect comfort?

Mattress size can affect how much sleeping space you have, but size is only one part of mattress comfort. Your preferred firmness, mattress construction and sleeping position also influence how a mattress feels. Couples may want a larger mattress if they prefer more individual sleeping space, while single sleepers may prioritise available bedroom space.

Is a king size mattress longer than a double?

Yes. A standard UK king size mattress is 200cm long, while a standard double is 190cm long. A king is also wider: approximately 150cm compared with 135cm for a double. The additional 10cm of length can be useful if you prefer more room at the foot or head of the mattress.

What mattress size is best for a small bedroom?

The most suitable mattress size for a small bedroom depends on the room layout, bed frame and amount of floor space you need to retain. A single or small double can provide a more compact footprint than a double, king or super king. Measure the available space and check the full external dimensions of the bed frame before choosing.

Can I put a different size mattress on my bed?

A mattress should normally match the intended size of the bed frame. Using a mattress that is too small can leave gaps, while a mattress that is too large may not fit correctly or sit securely within the frame. Check the internal mattress dimensions of your bed and compare them with the mattress dimensions before buying.

What mattress size is suitable for two people?

A double, king or super king mattress can be used by two people, depending on the available space and individual preferences. A double provides a more compact shared sleeping surface, while a king or super king offers additional width. Consider both the bedroom size and how much personal sleeping space each person wants.

Are all UK mattresses the same length?

No. Most standard single, small double and double mattresses are 190cm long, while standard king and super king mattresses are 200cm long. Longer mattress options are also available for some sizes. Always check the exact dimensions of the individual mattress and the bed frame before ordering.

What are My Payment Options at Bensons for Beds?

Whichever size mattress you are planning to buy, at Bensons for Beds, we understand that mattresses aren’t cheap. Especially those top quality ones offering premium features that you might be considering. As such, we have a range of payment options to making buying the right mattress size easier to afford. These different payment options allow you to buy a mattress with 0% interest-free finance, Buy Now Pay Later, or Klarna pay-in-3 and spread the cost into more affordable repayments.

Note: All mattress financing options are subject to approval following a quick and easy credit check that can be completed online.