How to choose the right king size mattress?

Firstly, you should decide on how much support you need and your preferred firmness level. Then, decide on your preferred type of mattress. Finally, look for a king mattress that fits your budget and how much you'd like to spend. If you're getting a new bed too, don't forget to check it fits your bedroom comfortably!

Of course, the 5ft mattress mainly suits average or larger bedrooms. But that shouldn't stop you from selecting the royalty of a king-sized mattress because of a little thing called space! So long as you have enough space to move around your room comfortably, you can still enjoy a blissful night's sleep. You can really relish the luxurious space and comfort that only a king size mattress can offer.

We're confident you will recognise the value and quality of every one of our carefully selected king mattresses. Browse our collection today - and if you need any support choosing the perfect mattress for you, look no further than our helpful mattress advice guides.

How to find the right king size mattress firmness for your sleeping position

Whether you're a back sleeper, side sleeper, front sleeper - or a mix of all three - we have the perfect king size mattress for you.

Best king size mattress for side sleepers

If you sleep on your side, we recommend a mattress with lots of cushioning. This is especially important if you have wide shoulders or hips. You could try a king size memory foam mattress, or a gel mattress if you prefer a cooler feel. Side-sleepers should also consider a softer or medium feel mattress.

Best king size mattress for back sleepers

Back sleepers usually need higher levels of support, to ensure healthy spinal alignment. Pocket sprung mattresses provide the best support, and for extra back care, you could choose an orthopaedic mattress. We recommend a medium-firm or firm king size mattress.

Best king size mattress for front sleepers

If you're a front-sleeper, you'll need more cushioning than a back-sleeper, but less than a side-sleeper. This balance of comfort and support is important for pressure relief. We recommend a hybrid mattress with pocket springs, and you may find a medium or medium-firm king size mattress the most comfortable.

Find your perfect king size mattress brand

We stock thousands of king size mattresses from our huge range of trusted brands. No matter what brand you choose, you'll get Free Next Day Delivery as standard, and great savings too.

Silentnight king size mattresses

You'll easily find the best Silentnight king size mattress to suit your needs. Choose a Silentnight Mirapocket mattress for great back care and support. Silentnight's Eco range is cool and breathable, whilst a Silentnight memory foam mattress is cosy and comfortable.

Sealy king size mattresses

A Sealy king size mattress is the perfect choice if you're looking for long-lasting support and a range of comfort options. Many Sealy mattresses are hypoallergenic, too. If you need enhanced back care, take a look at Sealy's ortho mattresses - they're created in conjunction with leading orthopaedic experts.

Sleepeezee king size mattresses

Sleepeezee offer a wide range of king size mattresses to suit all preferences and budgets. Choose from a great selection of pocket sprung mattresses for healthy spinal alignment. Sleepeezee's natural mattress collection includes 100% British wool, cashmere and cotton to keep you warm in winter and cool in summer.

Millbrook king size mattresses

Enjoy luxurious comfort with a king size Millbrook mattress. Handcrafted from a fine blend of Hampshire wool, cotton, silk and cashmere, these natural comfort layers are breathable, springy-soft yet supportive. You can try your new mattress for 60 nights with Millbrook's free sleep trial, too.

SleepSoul king size mattresses

Choose a SleepSoul king size mattress for plush comfort and great value for money. There are memory foam options, gel and even pillow top mattresses for the cosiest sleep. Plus, each mattress arrives rolled up for faster, easier delivery.

What's the best king size mattress?

The best king size mattress for you will give you ideal levels of comfort and support, depending on your sleeping position, weight and body shape. Our king size mattresses come in five firmness ratings so you can get the support you need, including medium-soft, medium, medium-firm, firm and extra firm.

The feel of the mattress matters too - you might like sleeping on traditional, natural mattresses or prefer the soothing comfort of memory foam.

Choose from our great range of types and firmness and find the perfect mattress for your best night's sleep yet.

What size is a king size mattress?

A king size mattress measures 5 feet wide by 6 feet 6 inches long (150 cm x 200 cm). They're one of the largest mattresses available, so a 5ft mattress is perfect if you love to stretch out in a spacious bedroom. A king size mattress is around 1ft smaller than a super king mattress, so they're ideal for couples and great for families who enjoy having the extra space without taking up too much of the bedroom. For even more luxury, consider our biggest size, the super king mattress.

Which types of king mattress are on offer?

You can choose from a wide variety of 5ft mattresses, all available with Free Next Day Delivery. Each type of mattress has different benefits.

Orthopaedic king size mattresses

Orthopaedic mattresses provide the highest levels of enhanced back care. Also known as ortho mattresses, these types are usually firmer and feel more supportive than standard mattresses.

Pocket sprung king size mattresses

Supportive and comfortable, king size pocket sprung mattresses ensure healthy spinal alignment as you sleep. Each pocket spring reacts independently to the next, giving you personalised support for every area of your body.

Hybrid king size mattresses

Also known as a combination mattress, a hybrid king mattress offers the perfect blend of foam comfort and supportive pocket spring layers. This means you'll get maximum comfort and great support for your back.

Memory foam king size mattresses

Choose a king size memory foam mattress if you love to feel cocooned as you sleep. Memory foam contours gently to your unique shape for a tailor-made feel and soothing pressure relief.

Pillow top king size mattresses

Luxurious and comfortable, pillow top mattresses give you that hotel experience from the comfort of your own home. You'll typically sleep "in" rather than "on" your pillow top mattress, so it will feel cosy and comfortable.

Natural king size mattresses

A king size natural mattress is a great option if you're looking for sustainable comfort. Handcrafted from materials including wool, cotton and cashmere, these mattresses naturally regulate body temperature, too.

Can I buy a cheap king size mattress?

Yes - if you're looking for a cheap king size mattress, you're in luck. All of our mattresses come with huge savings, with up to 50% off our already low prices! Simply sort your search by price to find the best value mattress for your budget. We also offer Free Delivery, so you can sleep comfortably for less when you shop with us.

It's good to know that you only need to change your mattress every seven years, so it's worth investing in a high-quality mattress - it can make a huge difference to your sleep. With our king size mattresses on sale, we've made quality mattresses even more affordable, so you can get the best king mattress for your budget.