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Looking for a bed that offers a tad more space? In that case, a king size mattress may be the one to opt for, especially with our variety of tensions, spring systems, fillings and more.

How big is a king size mattress?

King size mattress dimensions

A king size mattress measures 5'0" in width by 6'3" in length or 150cm x 200cm. Our second-largest mattress is excellent for anyone who likes to sprawl out at night or shares a bed with a partner. To view other mattress sizes, use our filters above to change the search results.

Should I consider a super king mattress?

In truth, both a king and super king bed and mattress will provide a spacious sleeping solution. Therefore, whether the additional space of a super king bed frame appeals to you should help determine what mattress you opt for. Your room size should also be taken into consideration before any purchase. 

What brands of king size mattresses do we stock?

At Mattressman, we stock a wide array of trusted manufacturers and brands anywhere from decades to centuries of experience in the mattress industry, including Silentnight, Hypnos, Relyon, Sealy, Sleepeezee, British Bed Company, JAY-BE, Shire Beds, Snuggle Beds, and so many more. With this, some of these brands have received awards for their knowledge and craftsmanship of mattresses. The highest accolade is the Royal Warrant. We have beds good enough for the royal family in our range, so you can find the best king mattress to provide the ultimate night's sleep. Our user-friendly website allows you to apply filters and search via brand; so whether it's our collection of Silentnight king size mattresses, our Sealy king size mattresses or any other king mattress, we make it easy for you to settle on your new sleeping solution. 

What are the right firmness ratings for me?

Finding the proper mattress tension essentially boils down to your preferred sleeping position. There's a mattress firmness for everyone in our range of king-size mattresses.

"I sleep in all positions"

If you can't keep still at night, a medium firm mattress is the mattress firmness for you. Neither too soft nor too firm for any sleeping position, a medium firm mattress will support you all night long and promotes healthy spine alignment.

"I prefer to sleep on my side"

For a preferred side sleeper, a soft or medium king size bed will cushion pressure points such as your shoulders and hips. This contributes to keeping your spine aligned in a healthy position and promotes good posture.

"I sleep on my back/front"

Our range of king size mattresses has options for people who prefer to sleep on their back or front. If you suffer from back pain and prefer to sleep on your front, you should avoid doing so as it can place extra strain on your lower back. Usually, a firm mattress will ensure your back is correctly supported throughout the night. However, if you suffer from joint or back pain, an extra firm mattress will supply the support you need. Overall, it would be best to look for orthopaedic king size mattresses.

What types of king size mattresses are there?

Stocking many mattress types, we are sure you can find the right king size mattress for you here.

Traditional spring mattresses

Pocket sprung mattress

One of our most popular kinds of king size mattresses, our pocket spring mattresses comprise supportive pocket spring layers with each spring encased in a fabric pocket and react individually to body movements. Not only does this ensure the mattress surface moves with the contours of your body, but it supplies total body support and even weight distribution. Shop our king size pocket sprung mattresses today to find the perfect bed.

Open coil

An open coil king size mattress spring system comprises a continuous wire that runs vertically down the bed. Known for being a cheap king size mattress and a great budget option, they are quality mattresses that can provide brilliant firm support for years to come. This is why the best open coil king size mattresses are for preferred back or front sleepers.

Other types

Memory foam mattress

Memory foam is a popular choice for a sleeper who prefers a mattress that can mould to the contours of your body whilst you sleep. Memory foam comprises millions of tiny holes that seep air when applying pressure. This allows the king size mattress to provide excellent support, pressure relief and extra comfort. Overall, this is why memory foam is fantastic for many kinds of sleeping positions. With this in mind, if you're after cloud-like comfort, our king size memory foam mattress collection is sure to leave you spoilt for choice.


Similarly, latex mattresses offer a responsive mattress surface comprised of natural latex. With unparalleled durability, latex includes a bouncier open cell structure yet can still mould to your body shape. With many latex beds lasting over 10 years, it's no wonder they can be referred to as the best king-size mattress.


Need help deciding between a traditional spring mattress, foam or natural materials? Look no further than our range of hybrid king size mattresses. A hybrid mattress combines a pocket sprung or open coil spring system with memory foam, latex or other natural king size mattresses. This means you can benefit from the support of a spring mattress and an array of other advantages from different comfort layers. Shop our affordable hybrid king size mattress options to find your perfect choice today.

What are the benefits of a king size mattress?

Our range of king size mattresses incorporates advanced technology such as Geltex, gel foam, comfort foams and natural materials that are worth investing in. Geltex is known for temperature regulation, so if you feel hot throughout the night, Geltex is terrific for keeping your body temperature comfortable all night long. Natural fillings also have many benefits, such as temperature regulation, breathability, insulation and softness, adding unparalleled comfort to the bed. Hand-tufted mattresses are brilliant for ensuring fillings are in place, and the tension remains in a bed for many years.

Looking for a sleeping solution that offers a tad more space? In that case, a king size mattress may be the one to opt for, especially with our variety of tensions, spring systems, fillings and more.

Why purchase with Mattressman?

Shopping with us means your new king bed purchase will be as simple as ever. We offer the most extensive range of mattresses in Britain, so you can be sure to find the perfect bed for you. With an emphasis placed on comfort, support and durability, our king size mattresses offer the perfect night's sleep. On top of this, we offer free delivery on all king size mattresses in stock. You can be on your way to super sleep as your perfect king size mattress can arrive as soon as the next working day. We can also remove and recycle your old mattress, so you have one less thing to worry about.

King size bed and mattress sale

On top of our already fantastic prices, explore the latest savings across our entire range. Alternatively, if you're looking to add additional comfort to your existing mattress, consider a king-size mattress topper.

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