UK King Size Mattress Dimensions: Your Ultimate Guide

mattress size

Embarking on the quest for the perfect night's sleep begins with understanding the dimensions of a UK king size mattress. This guide delves into the essential details of UK mattress size, ensuring you make an informed choice for unparalleled comfort and space. Whether you're upgrading your sleeping experience or fitting out a new bedroom, the dimensions of a king size mattress in the UK are crucial to know.

1. Overview of UK mattress sizes

Understanding UK mattress sizes

When we talk about UK mattress size, there are a variety of options to suit different needs and preferences, from single mattress to super king size mattress. Each size is designed with a specific target audience and usage scenario in mind, and understanding these sizes will help you make a more informed purchasing decision.

What is the size of a king size bed in the UK?

In the UK, super king size mattress usually refers to a mattress that is 183cm (72 inches) wide and 200cm (79 inches) long. This size offers generous sleeping space and is perfect for sleepers who are looking for the ultimate in comfort and space.

Detailed dimensions of king size mattresses in the UK

For king size mattresses, the standard dimensions are 150cm (59 inches) wide by 200cm (79 inches) long. This is approximately 10cm (4 inches) wider than a double mattress, providing more freedom and comfort for sleeping.

Before choosing a mattress, it's vital to measure the dimensions of your room to ensure that your new mattress will both fit perfectly in your space and meet your usage needs. Also, consider the movement path of the mattress to ensure a smooth transition into your bedroom.

Next, we'll take a closer look at all the factors you need to consider when choosing a king size mattress to ensure you find the best mattress for your individual needs.

mattress size

2. Factors to consider when choosing a king size mattress

Comfort and Support

Comfort and support are two essential factors to consider when choosing king size mattresses. Different types of mattresses, such as memory foam, latex or sprung mattresses, offer different levels of support and comfort. Memory foam mattresses are prized for their excellent pressure point relief, while latex mattresses are popular for their long-lasting support and natural anti-allergenic properties. Choosing the type of mattress that best suits your body type and sleeping habits is key to ensuring a good night's rest.

Budget planning

While a super king size mattress may be the most luxurious option, king size mattresses offer a more affordable option that still provides plenty of space and comfort. Set a reasonable budget and look for the best mattress options within that range. Remember, investing in a high-quality mattress is essential to ensuring long-term sleep health.

Testing and return policies

It's important to know a mattress brand's test-sleep policy before deciding to make a purchase. Many brands offer trial periods of weeks or even months, allowing you to test the comfort and support of the mattress at home. Make sure you're also familiar with return policies so that you can return your mattress hassle-free if it doesn't meet your expectations.

Next, join us as we explore our UK mattress sizing FAQs to help you with any queries you may have about choosing a mattress.

3. FAQs about mattress sizes in the UK

What is the size of the largest bed in the UK?

When it comes to the largest mattresses available to buy on the UK market, the super king size mattress is usually the most popular size. However, for those looking for a mattress that goes beyond the standard size, some brands also offer a customisation service that allows for sizes that are even larger to suit specific needs. This customisation option opens up endless possibilities for individuals who have special space or comfort needs.

Tips for Choosing a Super King Size Mattress

When considering the purchase of a super king size mattress or any other size mattress, it is important to consider the layout of your room. Ensure that you leave enough space around the mattress, not just for aesthetic reasons, but also to ensure that you can easily get in and out of your bed. Additionally, considering a possible future move or room rearrangement, choosing a mattress size that can accommodate the change will be a wise decision.

Are you ready to get started? Let's continue to dive into how to maintain and care for your mattress to ensure it continues to provide optimal support and comfort.

mattress size

4. Care and Maintenance

Maintenance and care of your king size mattress

To ensure that your king size mattresses remain comfortable and supportive for a long time, proper care and maintenance is essential. Here are some key tips for caring for and maintaining your mattress:

  • Flip and Rotate Regularly: To prevent dents and uneven wear and tear, it's a good habit to flip or rotate your mattress every three to six months. Note that some modern mattresses are designed to be used on one side, in which case they only need to be rotated rather than flipped.
  • Cleaning and care: Regularly vacuuming the surface of your mattress will remove dust and allergens. For stains, wipe gently with a mild detergent and a damp cloth, avoiding the use of too much water or strong chemical cleaners.
  • Use a mattress protector: A mattress protector is an effective way to protect your mattress from dust, stains and wear and tear. Choose a breathable protector to keep your mattress breathable and comfortable.
  • Proper Support: Ensuring that your mattress is properly supported will prevent sinking and warping in the middle. Check your bed frame or boards regularly to make sure they are still sturdy and undamaged.

By following these simple care and maintenance tips, you can extend the life of your mattress and ensure a comfortable, restorative night's sleep every night.

Now, let's move on to the Buying Guide section to find out where you can buy the right King size mattress for you and how to make an informed buying decision.

5. Buying Guide

Recommended: Suilong 20cm Hybrid Mattress

When you're looking for a mattress that will provide you with an unrivalled sleeping experience, the Suilong 20cm Hybrid Mattress is the perfect choice. This mattress caters for a wide range of sleeping needs with its superior edge support, comfort and innovative design. Let's take a closer look at why this Suilong Mattress is the ideal choice for you:

Edge Support with Medium Tension

The Suilong Mattress offers excellent edge-to-edge support with medium tension to ensure that whether you sleep on your side, back or stomach, you are well supported and wake up in the morning without pain or soreness. This is made possible thanks to the support of a 3-zone pocket spring system, tailored to your comfort, and our 2 layers of innovative memory foam that moulds to the shape of your body for the ultimate in pressure relief and snug comfort.

Soft and Anti-Allergenic Knit Cover

The cover is made from a super soft and breathable fabric with cotton threads in the weave to help protect the mattress from dust and other allergens. This 3ft mattress allows air to flow more freely through the core of the mattress springs for a cooler night's sleep, whilst helping moisture to evaporate more quickly. This firm mattress meets all CertiPUR-US strict standards for materials, emissions, durability and performance.

Motion Isolation

If you've been searching for the right mattress, you'll be proud of our hybrid mattress - it's perfect for people who move around a lot at night and don't want to disturb their partner. This is thanks to the combined efforts of hundreds of independently operating spring coils. A layer of high-density foam combines with the support of innersprings to provide a medium-firm feel. We offer an at-home trial period of up to 101 days to allow you to fully acclimatise to your new mattress.

Orthopaedic Wave Memory Foam Mattress

The wave-shaped foam layer adapts to your unique body shape and curves. Our ergonomic springs dynamically adapt to your body as you change sleeping positions during the night, reinforcing the core area designed to keep your spine aligned. This pocket sprung mattress is a medium-firm mattress that is comfortable to sleep on, yet firm enough to support your body properly. At the end of a long day of work, study and life, the SUI LONG Bedding helps to take the edge off.

Suilong Professional Design

You don't always need to spend a fortune to get a decent night's sleep.The Suilong mattress is proof of this, offering a cool and comfortable night's sleep at a fraction of the cost. This single mattress is compressed, rolled and vacuum encapsulated in a box. We are a manufacturer specialising in the production and processing of mattresses as well as having a dedicated development and R&D team. If you have any comments, corrections or enquiries about our products, please feel free to contact us. You can also enjoy a discount when you buy now, if you are interested, please feel free to contact us.


Recommended Purchase Product Size: 5FT UK KING (150 X 200CM): £259.00


Suilong 20cm Hybrid Mattress

Suilong 20cm Hybrid Mattress

soft & hypoallergenic knitted cover

motion isolation

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To enhance your sleeping experience, choosing the Suilong 20cm Hybrid Mattress is undoubtedly a wise choice. Not only because of its high quality and innovative design, but also because Suilong Mattress promises to bring you the best quality of sleep. Experience it now and let the Suilong Mattress lead you into a night of comfort and rejuvenation.

So far, we've explored our comprehensive guide to choosing a mattress size in the UK, from an overview of sizes to care and maintenance to recommending the high-quality, value-for-money Suilong 20cm Hybrid Mattress, and we hope that this guide will help you to make the best choice for you, and to enjoy a great night's sleep every night.


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Q1: How big is a king size bed in the UK?

A1: A king size bed in the UK measures 150 cm in width and 200 cm in length (5ft x 6ft 6in). It offers ample space for couples or individuals who prefer extra room to stretch out during their sleep.

Q2: What dimensions does a king size mattress have?

A2: The dimensions of a king size mattress are typically 150 cm by 200 cm (59 inches by 79 inches). This size is ideal for providing luxurious space and comfort for sleepers.

Q3: How is a king size categorised in the UK?

A3: In the UK, a king size is categorised by its standard dimensions of 150 cm by 200 cm. It's one step larger than a double mattress and is popular among couples seeking extra sleeping space.

Q4: What is the largest bed available in the UK?

A4: The largest standard bed size available in the UK is the super king size, measuring 180 cm by 200 cm (6ft x 6ft 6in). For those requiring even more space, bespoke sizes can be made to order.

Q5: Can you explain the difference between a double and a king size mattress in the UK?

A5: The primary difference lies in the dimensions. A double mattress measures 135 cm by 190 cm, while a king size mattress is larger, measuring 150 cm by 200 cm. The king size offers more width and length, providing extra space and comfort.

Q6: Is a king size bed suitable for all bedroom sizes?

A6: While a king size bed offers superior comfort and space, it's essential to measure your bedroom first to ensure it fits comfortably. There should be enough space around the bed for easy movement and additional furniture.

Q7: How does the size of a UK king mattress compare to other countries?

A7: The UK king mattress size is unique, especially when compared to the US, where a king mattress measures approximately 193 cm by 203 cm. It's important to check size compatibility when buying bedding from international brands.

Q8: What type of sleeper is best suited for a king size mattress?

A8: A king size mattress is best suited for couples who appreciate extra space while sleeping. It's also ideal for individuals who move around a lot during sleep or those who share the bed with pets or children.

Q9: Are there any special considerations for bedding with a king size mattress?

A9: When purchasing bedding for a king size mattress, ensure you buy the correct size to fit. Look for bedding labelled "UK King" and consider depth measurements for fitted sheets, especially if your mattress is deeper than standard sizes.

Q10: How should I care for my king size mattress to ensure its longevity?

A10: Regularly rotate your mattress to distribute wear evenly, use a mattress protector to guard against spills and stains, and ensure proper support from your bed frame or base. Vacuuming your mattress occasionally can also help maintain its cleanliness and extend its lifespan.

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