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Mattress Size Guide

The size of your bed and mattress will have a big impact on how comfortably you sleep. To ensure you make the right decision, we’ve compiled a sizing guide that provides you with all the information you need. From the benefits of each mattress size to measuring considerations, we’ve covered it all.

What is the best bed size for me?

The best bed size for you will depend on a wide range of factors, including whether you sleep alone or with a partner, your size, any health conditions (such as back problems), how much space you have, and what your budget is. To help you make a good choice, we’ve provided a brief explanation of the benefits of each of the main mattress sizes. All of the measurements used in this section are based on UK standards. You can find European, USA American and IKEA measurements at the bottom of the page.

What size is a super king size mattress?

Super king beds measure 180 x 200cm or 6'0" x 6'6".

If having plenty of sleeping space is the most important factor in your decision, a super king size bed is the way to go. A super king allows you to spread out and is ideal if you’re a couple who value having enough room to wriggle and move about without impacting on your partner’s sleep.

If you’re considering a super king size bed, you need to be aware that you’ll need plenty of floor space, particularly if you want to fit in furniture around it. This is the biggest bed available in most cases and its large size means it makes quite an impact on how your bedroom looks! 

What size is a king size mattress?

King size beds measure 150 x 200cm or 5'0" x 6'6".

King size beds are a perfect compromise if you’re looking for a large amount of sleeping space but can’t quite fit a super king size in the bedroom. They’re spacious and ideal if you’re on the tall side or share the bed with a partner. The extra legroom will let you stretch out and get comfy - which is absolutely essential for a good night’s sleep.

Many people struggle to decide between a king size or standard double. We reckon it’s a pretty simple choice. If you can fit a king size bed in the bedroom, the extra space it offers is definitely worth it. The extra 10cm in length and 15cm in width may not sound like a lot, but it makes an enormous difference.

What size is a standard double mattress?

Standard double beds measure 135 x 190cm or 4'6" x 6'3".

The standard double is the most popular bed size in the UK. This is largely down to the fact that it fits in most bedrooms, while also offering a significant amount of sleeping space. This makes it a great choice if you’re concerned with over-cluttering or would like to add more furniture to the bedroom.

The standard double mattress size is also regularly found in guest rooms, which are generally a little smaller than master bedrooms. As they’re used less regularly, beds in guest rooms don’t need to be as large. However, they’ve still got to be comfortable. The standard double strikes this balance perfectly.

What size is a small double mattress?

Small double beds measure 120 x 190cm or 4’0” x 6’3”.

The small double is the standard double’s versatile, space-saving, smaller sibling. It’s designed for rooms that are shorter on space and will fit in most master bedrooms and spare rooms. If you’re a couple, you’ll be sleeping closer together but there’s still plenty of room - as long as neither of you are nocturnal fidgeters.

It’s a good choice if you’re worried that larger models will leave you without any space to move around the bedroom. The small double bed is also often found in growing kids and teenagers’ rooms. It’s a perfect intermediary stage between the classic single and a larger double or king size, allowing you to stretch out and make yourself comfortable, without dangling off the edges.

What size is a standard single mattress?

Standard single beds measure 90 x 190cm or 3’0” x 6’3”.

The standard single mattress size may seem small when compared to doubles and king size beds, but there’s still enough space for a fantastic night’s sleep. Standard singles are typically chosen for box rooms, guest rooms, and any bedrooms where floor space is prized more than sleeping space. 

They’re also well suited to children’s bedrooms, particularly younger kids who have no need for big, open beds. They’ll provide you with years of comfort and good models are built to last, so they’re a wonderful investment if you’re happy with the relatively small dimensions.

What size is a small single mattress?

Small single beds measure 75 x 190cm or 2’6” x 6’3”.

Small single beds are usually the smallest on the market, apart from cots and designs orientated towards babies. Younger children often prefer the cosier feel of a small single, so they’re a popular choice for kids who are just starting to sleep alone.

Of course, they’re also made for smaller bedrooms or those instances in which you need to fit more than one bed in a room. Sometimes bunk beds simply aren’t a practical choice, so small singles allow you to put two kids into a bedroom without compromising too much of the floor space.

What measurements should I take when buying a new bed or mattress?

Accurate measurement is key if you want the right size bed. We’d recommend double measuring everything to ensure you’ve got it right. Below, we cover a few essential sizing considerations when buying a new bed or mattress.

Sleeper measurements for determining bed size

The most important thing when choosing between bed sizes is that you find a model that’s right for you. After all, there’s no point in having a bed that you aren’t comfortable sleeping in! As a general rule of thumb, you want a bed that is at least 10cm longer than the height of the tallest person using it. 

You also want to make sure that the bed is wide enough. To do so, lie on your side and tuck your hands on your head, so your elbows stick out in front of your chest. If your elbows reach the edge of the mattress or touch your partner, you may want to think about a larger bed.

Room measurements for determining bed size

It’s important to remember that your bed isn’t the only thing in your bedroom. That means you need to make sure there’s space for any additional furniture and for you to move around without bashing your shins on the corner of the bed! Think about how much space you need, measure it, and then work out what’s left for the bed.

Remember to consider the way wardrobe doors open and make sure you consider the smaller details, such as where plug sockets are located and how the size and positioning of the bed will affect their use.

Bed measurements for determining mattress size

While bed frames are usually designed to match up with a specific mattress size (e.g., a standard double frame for a standard double mattress), there is some variation. Design features like headboards and footboards can influence the mattress sizes you’ll be able to use, so it’s always a good idea to measure first. 

Don’t forget that bed frames will be larger than your mattress dimensions, so don’t make the mistake of basing all your room measurements on the mattress or you’ll find you don’t have as much spare space as you thought!

Common considerations and errors

When choosing between bed sizes, there are a few extra things to think about and a few common pitfalls to avoid. First and foremost, you need to ensure that you’ll be able to get the bed up the stairs and into the desired room. While this isn’t a problem if you’re able to disassemble and reassemble the frame, it might be for beds that are pre-built and don’t come apart easily. Likewise, it’s a good idea to check that you can manoeuvre the mattress into the room, too.

What size mattresses and beds are there?

Working out mattress sizes can be confusing as different standards are often used across countries and different manufacturers may choose their own sizing. For instance, UK sizes differ from both European and US sizes, while IKEA designs beds typically conform to European specifications. 

Below, we’ve provided easy-to-read charts for:

  • UK beds 
  • European beds 
  • USA American beds
  • IKEA beds

UK sized mattresses

Bed/Mattress SizeDimensions (Metric)Dimensions (Imperial)
Small Single75 x 190 cm 2’6” x 6’3”
Standard Single90 x 190 cm3’0” x 6’3”
Small Double120 x 190 cm4’0” x 6’3”
Standard Double135 x 190 cm4’6” x 6’3”
King Size150 x 200 cm5’0” x 6’6”
Super King Size180 x 200 cm6’0” x 6’6”

European sized mattresses

Bed/Mattress SizeDimensions (Metric)Dimensions (Imperial)
Standard Single90 x 200cm3'0" x 6'6"
Small Double120 x 200cm4'0" x 6'6"
Standard Double140 x 200cm4'7" x 6'6"
King Size160 x 200cm5'3" x 6'6"

USA American sized mattresses

Bed/Mattress SizeDimensions (Metric)Dimensions (Imperial)
Twin96.5 x 188.0cm3’2” x 6’2”
Twin XL96.5 x 203.5cm3’2” x 7’0”
Full134.5 x 190.5cm4’5” x 6”2
California Queen152 x 203.5cm5’0” x 7’0”
California King183 x 213.5cm6’0” x 7’0”
USA King193 x 203.5cm6’3” x 6’6”

IKEA sized mattresses

Bed/Mattress SizeDimensions (Metric)Dimensions (Imperial)
Standard Single90 x 200cm3'0" x 6'6"
Small Double120 x 200cm4'0" x 6'6"
Standard Double140 x 200cm4'7" x 6'6"
King Size160 x 200cm5'3" x 6'6"

Author: Lucy

Lucy is a copywriter, trend spotter, and our resident sleep expert! Lucie has been with the team since 2018 and her articles cover a sweeping array of subjects from general product care, the latest bedroom design trends, ways to promote healthier sleep and jargon-busting explanations to help you understand what goes into our products. Do you have questions for Lucy & the team? Call one of our sleep experts today!