This is one of those decisions that sounds simple until you are standing in your bedroom with a tape measure, trying to work out whether a king size is actually going to fit without the wardrobe door becoming decorative. Then there is the added layer of deciding between a king and a super king, whether a small double is a sensible compromise or something you will quickly outgrow, and what a European king size actually is and whether you need one. If you have started browsing different mattresses, you will have seen just how many options there are.
At Land of Beds, we have helped thousands of customers work through this exact decision. This guide brings everything together in one place, from clear mattress dimensions and room clearance rules to the real-world scenarios that make one size a better choice than another, along with honest advice on when it is worth sizing up and when it is better to work with the space you have.
The Clearance Rule
Before we get into the individual sizes, let’s establish the one thing that makes every other decision easier. The right mattress size is the largest one your room can comfortably accommodate, and “comfortably” means with proper clearance, not squeezed into the last centimetre.
The reason this matters is simple: a bed that fits mathematically but leaves no room to move around it will make the room feel smaller and less functional than it did before the bed arrived. And that is a much harder problem to live with than having chosen one size smaller.
It is also worth thinking about how everything in the room actually works day to day. If there is a wardrobe nearby, make sure the doors can open fully once the bed is in place. These are the small details that can make a room feel either easy to live with or unexpectedly cramped.
All UK mattress sizes at a glance
Here’s a simple breakdown of all the standard UK mattress sizes, with both metric and imperial measurements, plus a quick way to explore each one at Land of Beds.
| Size | Width × Length (cm) | Width × Length (ft/in) | Best for | Shop |
|---|---|---|---|---|
| Small single | 75 × 190 cm | 2ft 6in × 6ft 3in | Children, very small rooms | Browse → |
| Single | 90 × 190 cm | 3ft × 6ft 3in | Children, single adults, guest rooms | Browse → |
| Small double | 120 × 190 cm | 4ft × 6ft 3in | Single adults wanting more space, small rooms | Browse → |
| Double | 135 × 190 cm | 4ft 6in × 6ft 3in | Couples, smaller bedrooms, single adults | Browse → |
| European double | 140 × 200 cm | 4ft 7in × 6ft 6in | IKEA bed frames, extra length in a compact width | Browse → |
| King size | 150 × 200 cm | 5ft × 6ft 6in | Couples, taller sleepers | Browse → |
| European king | 160 × 200 cm | 5ft 3in × 6ft 6in | IKEA and European bed frames, extra width | Browse → |
| Super king | 180 × 200 cm | 6ft × 6ft 6in | Couples wanting maximum space | Browse → |
| Super king zip and link | 180 × 200 cm | 6ft × 6ft 6in | Couples with different preferences, flexible setups | Browse → |
| Emperor | 215 × 215 cm | 7ft × 7ft | Very large bedrooms, maximum sleeping space | Browse → |
European sizes are also available, such as the European double (140 × 200 cm) and European king (160 × 200 cm). These are often chosen for compatibility with certain bed frames, particularly IKEA, or simply for a slightly different balance of width and length.
If your space or requirements are more specific, made-to-measure options are also available. It is worth speaking to our team to explore what is possible and what will work best for your room.
Each Mattress Size Explained and Who it Suits
What each size actually means in practice, who it’s right for, what room it needs, and when to choose it.
For adults, it is rarely the right choice. Even in smaller bedrooms, a standard single offers noticeably more space without a dramatic increase in footprint, and most adults who try a small single tend to outgrow it quickly.
At 90cm wide, it gives a single sleeper enough space to sleep comfortably without feeling restricted, while still allowing for a practical layout in smaller rooms. It is also the size most commonly used for zip and link beds, where two singles can be joined together to create a king size, giving couples the option of different tensions on each side.
At 120cm wide, it gives a solo sleeper noticeably more room to move during the night without taking up the full footprint of a double bed. For couples, though, it is usually too tight for regular use. Each person has around 60cm of space, which is less than a standard single, so it can quickly feel restrictive. If space allows, it is almost always worth moving up to a full double.
At 135cm wide, each person has around 67cm of space. That is more than a single mattress per person, but not by a huge amount. For couples who sleep fairly still, it is a comfortable and sensible choice. For restless sleepers, it can start to feel limited. If your room allows it, moving up to a king size often makes a noticeable difference to comfort without dramatically changing the footprint of the room.
This is often the point where couples stop noticing movement during the night and start sleeping more consistently. The extra length compared to a standard double also makes a noticeable difference for taller sleepers, giving more room to stretch out without feeling restricted.
For many couples, this is the point where sleep becomes properly uninterrupted. There is enough space to turn, stretch, and settle without feeling aware of your partner’s movement. It is also one of the most consistently well-reviewed upgrades, often described as something people wish they had chosen sooner. The only real consideration is space. This is a large mattress and works best in a room that can comfortably support it without feeling crowded.
A small emperor at 200 × 200cm gives each sleeper around 100cm of width, while a full emperor at 215 × 215cm increases that even further. The result is complete freedom of movement, but it does come with practical considerations. These are large pieces of furniture that need a properly sized bedroom to feel balanced rather than overwhelming.
Also available as zip and link (2 × 100 × 200cm)
Also available as zip and link (2 × 107.5 × 215cm)
Minimum Room Size Recommendations
| Mattress size | Mattress dimensions | Recommended minimum room | Notes |
|---|---|---|---|
| Small single | 75 × 190cm | 2.4m × 3m | Children’s rooms and very compact spaces |
| Single | 90 × 190cm | 2.4m × 3.2m | Comfortable with clearance for a bedside table |
| Small double | 120 × 190cm | 2.8m × 3.2m | Tighter than a double, check wardrobe door clearance carefully |
| Double | 135 × 190cm | 3m × 3.5m | A versatile size that works in a wide range of rooms |
| King size | 150 × 200cm | 3.5m × 3.5m | The most popular size for couples, often worth prioritising |
| Super king | 180 × 200cm | 4m × 4m | Generous space needed, measure carefully before ordering |
| Small emperor | 200 × 200cm | 4.2m × 4.2m | Large bedrooms and luxury spaces |
| Emperor | 215 × 215cm | 4.5m × 4.5m | Exceptional rooms, best suited to very large layouts |
What about height? When length matters more than width
Most people focus on the width of a mattress when choosing a size, and almost nobody thinks about the length until they are lying in bed with their feet brushing the end. It is a very common issue, and an easy one to avoid.
A good rule is to allow at least 10 to 15cm more than your height when choosing mattress length. Standard UK mattresses at 190cm tend to suit sleepers up to around 5ft 11in (180cm). King size and above, at 200cm in length, are generally more comfortable for anyone up to around 6ft 3in (190cm).
Long versions of smaller sizes, such as long single (90 × 200cm) and long double (135 × 200cm), are also available at Land of Beds. These can be a practical option if you need extra length but do not have the space for a king.
If your requirements are more specific, made to measure options are available. It is worth speaking to our team to find the best fit for your space and sleeping style.
Mattress Sizes For Couples: How to Choose Together
This is one of the most common conversations we have, and it is usually where the decision becomes much clearer.
In most cases, the best approach is to choose the largest size your room can comfortably accommodate. The difference in personal space between a double and a king size, 67cm per person compared to 75cm, may not sound like much on paper, but it is something couples consistently notice once they make the switch. The step from a king to a super king is even more significant, increasing each person’s space from 75cm to 90cm and giving you the equivalent of a long single each.
This option is available in king size (2 × 75cm) and super king (2 × 90cm). Each side can also be replaced independently over time, which makes it a flexible and more manageable long-term choice.
A king or super king, combined with a memory foam or hybrid construction, can make a noticeable difference by increasing personal space while reducing disturbance.
For families where this is a consistent setup, a super king or even a small emperor gives everyone enough space to sleep more comfortably without compromise.
Specialist sizes explained: European, zip and link, emperor
| European king size |
The European king size (160 × 200cm) is used by IKEA bed frames and some continental European manufacturers. At 160cm wide, it sits between a UK king (150cm) and a UK super king (180cm).
If your bed frame is designed for European sizing, this is the size you will need. A standard UK king size mattress will not fit correctly. Land of Beds stocks European king size mattresses across a full range of types and tensions. Always check your bed frame dimensions before ordering. |
| Zip and link |
Zip and link mattresses are two separate mattresses that join together along one edge to create a single bed. Each side can be chosen in a different tension, so one person can have a softer feel while the other prefers something firmer.
They are available in king size (2 × 75 × 200cm) and super king (2 × 90 × 200cm). Each half can be replaced independently, and the mattresses can be separated into two singles when needed. This makes them a practical option for guest setups or changing requirements. |
| Made to measure |
If your bed frame is not a standard size, for example a vintage frame, a bespoke bed, a caravan or motorhome, or an unusual room layout, a made to measure mattress is often the most practical solution.
Land of Beds can arrange made to measure mattresses across a range of types and tensions. It is worth speaking to our team to find the best option for your space and requirements. |
Frequently Asked Questions
The overall bed width increases by 15cm, from 135cm to 150cm, which is usually manageable in a room that already fits a double comfortably.
A super king offers a more spacious sleep for couples, but it does require a larger room, typically around 4m × 4m. If your space allows it, it is a meaningful upgrade. If not, a king size is still an excellent and comfortable choice.
A UK king mattress may appear to fit, but it will leave a visible gap around the edges. Always use a European king size mattress with an IKEA frame. Land of Beds stocks European king size mattresses across a full range of types and tensions.
It is always best to match your mattress size exactly to your bed frame size.
As a guide, allow at least 60cm on each accessible side and around 90cm on the main access side. Also check the space at the foot of the bed and make sure doors, wardrobes, and access points can open fully once the bed is in place.
It is always worth doing this before ordering rather than after.
Shop by Mattress Size
We stock mattresses in every standard UK size, from small single through to emperor, across a wide range of constructions, tensions, and price points. Made to measure options are also available if your space or bed frame requires something more specific.
If you are still unsure which size will work best in your room, our team is always happy to help.
You can call us on 01928 242829 or visit our showrooms in Greater Manchester and Cheshire for straightforward, practical advice.
Written by Alice Littler
Alice brings a background in marketing, design, and branding to Land of Beds, where she focuses on making sleep advice simple, relatable, and practical for everyday life. She holds a degree in Graphic Design with a specialism in branding and design, giving her a strong understanding of how interior spaces, colour, layout, and environment can influence comfort, mood, and overall wellbeing.
Her creative background allows her to provide both expert bed and mattress guidance and bedroom design inspiration that helps customers create spaces that feel as good as they look.
Alongside her work in marketing and branding, Alice has collaborated with internationally recognised brands including Campari and Aperol, Paulaner, and Malfy, helping develop her expertise in consumer-focused communication and lifestyle content. She has also been trained by and works closely with leading UK bed and mattress manufacturers including Harrison Spinks, Hypnos, and Vispring, building extensive knowledge of mattress technology, sleep ergonomics, bedroom comfort, and sleep wellness.
Passionate about the life-changing impact of quality sleep, Alice creates content designed to help readers make informed decisions to improve their sleep environment, wellbeing, and everyday routine.