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King Size Mattresses

150cm x 200cm, 5ft x 6ft 6"

A king size mattress is one of the largest widely available mattress sizes in the UK. Choose your mattress from a wide range of well-known manufacturers like Silentnight, Rest Assured, Dunlopillo, Sealy, Sleepeezee and many more.

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How to choose the right kingsize mattress

When it comes to mattresses, bigger ones can be better. Having more than enough room to spread out and move around can mean the difference between finding it challenging to get to sleep and easily drifting off to the Land of Nod in perfect peace. King size mattresses offer an expansive sleeping surface, measuring 150cm in width and 198cm in length, which is an extra six inches wider and three inches longer than a standard double. 

One of the most often-overlooked considerations is whether or not you have the room. However, you don’t need a bedroom the size of a church hall to enjoy all the benefits of a king-size mattress. As long as there is room at either side for each person to get in and out, there’s no reason to pass up the chance to doze off on a superior sleeping surface. Be sure to account for any bedroom furniture you might have.

For those with larger bedrooms, a king-size mattress on a king size bed will act as a stunning centrepiece. To add impact and appeal to the aesthetics, crown yours with a well-chosen headboard. These are available in a range of designs, materials, and colours, so you can choose one to suit your surroundings.

Why buy a kingsize mattress?

Generally speaking, king-size mattresses are ideal for those who are a little wider or taller than the average person. The extra length will prevent those with longer legs from exposing their feet to the cold, while the additional width gives plenty of room for your bedfellow.

King size mattresses are also beneficial for those prone to nocturnal wriggling. To minimise motion transfer between sleepers, look for king size mattresses with pocket springs. These are springs individually housed in fabric pockets. Free to move independently, they react to the movement of each sleeper without causing the rest of the mattress to wobble. With the added space, you can shift position throughout the night, and your partner won't feel a thing.

What size is a king size mattress?

All our king size mattresses are 5' x 6' 6" (150 cm x 200 cm). This is both longer and wider than a double mattress, which measures 135cm x 190cm, and comfortably accommodates two sleepers. King-size mattresses are incredibly popular in the UK, and they’re especially loved by families with young children who appreciate that bit of extra space for the little ones to climb into in the mornings. In fact, there are only two types of mattresses that are bigger: the super-king mattress, and the emperor.

The depth of a king mattress varies depending on what sort of option you choose. The shallowest choices are around 14cm deep, which are very lightweight and convenient. The thickest options are around 35cm deep, offering a little more comfort for those who like a more robust feel to their king-size bed.

King size mattresses work great with our range of King size divan beds.

Find the right king size mattress brand for you:

We stock hundreds of king size mattresses from our extended range of leading mattress brands. Regardless of the brand you choose, you will find the perfect king size mattress at a price you will love. 

Silentnight king size mattresses

Are you a Silentnight fan? If yes, then you’ll love our collection of Silentnight king size mattresses. If you are looking for a new mattress that provides full back care support, then check out our Silentnight Miracoil mattresses. Alternatively, if you looking for a mattress to sink into, browse our Silentnight memory foam mattresses that we have available.

Sealy king size mattresses

A Sealy king size mattress is a perfect choice if you are looking for high-quality comfort. If you need a mattress with great support for your back, our Sealy ortho mattresses will provide a great solution. Furthermore, our Sealy hypoallergenic mattresses are ideal for those suffering from allergies.

Sleepeezee king size mattresses

Our Sleepeezee king size mattress range has something for everyone, suiting all budgets and preferences. Whether you looking for a mattress that provides a healthy spinal alignment, or a model that has natural fillings such as wool, then look no further than our Sleepeezee mattress collection. 

Hypnos king size mattresses

We are delighted to offer a wide range of luxurious Hypnos king size mattresses. Hypnos are renowned for using superior-quality materials that ensure models are eco-friendly and provide premium comfort. Being Royal Warrant holders as well, just shows why Hypnos mattresses are one of the most sought after brands. 

SleepSoul king size mattresses

If you are looking for great value for money and plush comfort, look no further than our SleepSoul king size mattress range. There are memory foam options, hybrid mattress options and even cool gel and reflex foam models available. Plus, with all models being rolled up for delivery, it makes it easier for you to transfer your mattress to the room you want it in. 

Choose your perfect king size mattress by type:

There are many different options available when it comes to a king size 5ft mattress, allowing you to select your preferred firmness, material, and spring count. King size mattresses are available in a soft to extra firm feel and with spring counts ranging from 800-1200 to more than 4000. In terms of material, there’s a wealth of choice, with everything from pocket and Miracoil springs to natural fillings, memory foam, gel foam, and even medical grade options. Our most popular options of 5ft mattresses include pocket sprung and memory foam.

Pocket sprung king size mattresses

A pocket sprung king size mattress features individual springs which are wrapped up in their own cloth sleeve. This allows the mattress to be responsive to movements throughout the night. These designs are usually available in a medium to firm king size mattress, which can help promote good posture while providing a comfortable night’s sleep.

Memory foam king size mattresses

A king size memory foam mattress is made from a special foam material that moulds to the body’s contours as you change sleeping position. These mattresses are especially popular amongst people who suffer from back pain, as they provide a good level of support and cushion your joints.

Hybrid king size mattresses

Also called a combination mattress, a hybrid king size mattress combines foam comfort with supportive pocket spring layers. As a result, you'll have great back support and maximum comfort.

Orthopaedic king size mattresses

We offer an array of orthopaedic king size mattresses that enhance back support. These types of mattresses are also called ortho mattresses and are considerably firmer than standard models.

Octaspring king size mattresses

Dormeo developed the Octaspring to create a cooler, fresher feel but with the same responsive feel of memory foam. Octasprings allow up to eight times more airflow, creating a fresher feel that’s great for anyone who suffers from night sweats. The firmness rating sits in the medium range, making them suitable for most sleepers. 

Latex king size mattresses

If you like the feel of memory foam but want something a little greener, natural fibres is the right choice. Latex king size mattresses are not only hypoallergenic and anti-bacterial, but they are also more biodegradable at the end of their life. They’re a friendlier choice if you want to keep your carbon footprint down.

Pillow top king size mattresses

A combination of firm support but that deliciously soft, sinking-into-bed feel at the end of a busy day, a pillow-top king-size mattress gives you all the comfort you could need. The softer feel is ideal if you prefer to sleep on your front or side. They’re also usually single-sided so they’re easier to maintain.

What’s the best king size mattress for my sleeping position:

Best king size mattresses for back sleepers

If you sleep on your back, then you will need a higher level of support to ensure your spine is correctly aligned. For the best support, we recommend pocket sprung mattresses. Additionally, if you want extra back care, you can choose an orthopaedic mattress. We advocate a firm or medium-firm king size mattress

Best king size mattresses for side sleepers

Side sleepers will benefit from a mattress that provides lots of cushioning, especially if you have wide hips and shoulders. You may want to consider a king-sized memory foam mattress or a gel mattress if you prefer a cooler feeling. A medium or softer king size mattress would be ideal for side-sleepers.

Best king size mattresses for front sleepers

Compared to back sleepers, front sleepers will need more cushioning, but less than a side sleeper would need. For pressure relief, it's important that front sleepers find a good balance between comfort and support. Hybrid mattresses with pocket springs are the most comfortable for people who sleep on their front. In addition, we recommend a king size mattresses that has a medium or medium-firm firmness.

Still need help deciding the best king size mattress for your home? Discover the perfect one for you, using our handy mattress guide

How much is a 5ft mattress?

Although a king-size bed mattress is the ultimate in luxury, it is a lot more affordable than many people think. Most of our mattresses at this size cost between £200 and £700. However, prices for a cheap king size mattress start at less than £120, and our more luxurious mattress options range from £1500 - £5000. We guarantee that we offer some of the best prices in the UK and we really do have something to suit all budgets. And, don't forget, we also offer free next day delivery across the mainland of UK.