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King Size Mattresses

King Size Mattress Range - 5 ft

View our range of King Size mattresses, providing that little bit of extra space and comfort over a Double mattress. They are not only great for couples but also for taller people as they are longer than standard double mattresses. King Size mattress measurements are 150cm x 200cm (5' x 6'6"), you can view our mattress size guide here.

Most Popular Kingsize Mattresses
  1. 12 Day
    Hypnos Elite Luxury Mattress
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    Rating:
    90%

    (18)

    Hypnos Elite Luxury Mattress
    RRP £649.00 Save £259.00 Now £390.00
    • https://www.mynextmattress.co.uk/media/option_images/best-selling-mattress.png
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    12 Day

    From only £15.26pm

  2. 6 Day
    Sealy Mellbreak Mattress - Ortho Plus Collection
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    Rating:
    92%

    (36)

    Sealy Mellbreak Mattress
    RRP £499.00 Save £190.00 Now £309.00
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    • https://www.mynextmattress.co.uk/media/option_images/best-selling-mattress.png
    6 Day

    From only £12.09pm

  3. Next Day
    Firm Emma mattress
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    Rating:
    90%

    (4)

    Emma Diamond Firm Mattress
    RRP £1,499.00 Save £832.00 Now £667.00
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    Next Day

    From only £26.10pm

  4. 13 Day
    Buy Romantica mattresses online
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    Rating:
    93%

    (3)

    Romantica Rock Solid Ortho 1350 Mattress
    RRP £379.00 Save £130.00 Now £249.00
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    • https://www.mynextmattress.co.uk/media/option_images/best-selling-mattress.png
    13 Day

    From only £9.74pm

A King Size mattress provides that little bit of extra space and comfort over a Double mattress, giving you and your partner the space to spread out without disturbing each other's sleep. They are not only great for couples but also for taller people as they are longer than standard double mattresses.

Having as much space as possible during a night's sleep is very important. Being able to move around whilst sleeping will not only help you sleep deeper but also benefits recuperation as the body can relieve pressure points and aid circulation.


Kingsize Mattress Dimensions:
150cm (width) x 200cm (length)
5' (width) x 6'6" (length)


Please note; a Kingsize mattress is 3 inches (approx 10cm) longer (head to toe) than the smaller sizes, so please keep this in mind if you're planning on using a Double base with a new Kingsize mattress.


Click Here to view our full size guide.

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  1. Next Day
    Buy the award-winning Hypnos Wool Origins 6 mattress online
    Rating:
    90%

    (31)

    Hypnos Wool Origins 6 Mattress
    Now £1,449.00 Was £2,079.00 Save £630.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    • https://www.mynextmattress.co.uk/media/option_images/best-selling-mattress.png
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    Next Day Delivery

    From only £56.69pm

  2. 11 Day
    Hypnos Elite Luxury Mattress
    Rating:
    90%

    (18)

    Hypnos Elite Luxury Mattress
    Now £579.00 Was £879.00 Save £300.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    • https://www.mynextmattress.co.uk/media/option_images/best-selling-mattress.png
    • https://www.mynextmattress.co.uk/media/option_images/10yr.png
    • https://www.mynextmattress.co.uk/media/option_images/ps.png
    • https://www.mynextmattress.co.uk/media/option_images/fibre.png
    11 Day Dispatch

    From only £22.65pm

  3. 6 Day
    Sealy Mellbreak Mattress - Ortho Plus Collection
    Rating:
    92%

    (36)

    Sealy Mellbreak Mattress
    Now £409.00 Was £649.00 Save £240.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    • https://www.mynextmattress.co.uk/media/option_images/5yr_1.png
    • https://www.mynextmattress.co.uk/media/option_images/turn.png
    • https://www.mynextmattress.co.uk/media/option_images/extra-firm.png
    • https://www.mynextmattress.co.uk/media/option_images/best-selling-mattress.png
    6 Day Dispatch

    From only £16.00pm

  4. Next Day
    SleepSoul Space 2000 Mattress
    Rating:
    95%

    (51)

    SleepSoul Space Mattress
    Now £368.90 Was £699.00 Save £330.10
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    • https://www.mynextmattress.co.uk/media/option_images/best-selling-mattress.png
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    Next Day Delivery

    From only £14.43pm

  5. Next Day
    Emma Original Mattress - Buy online at MyNextMattress
    Rating:
    95%

    (15)

    Emma Original Mattress
    Now £489.00 Was £849.00 Save £360.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    • https://www.mynextmattress.co.uk/media/option_images/10-year.png
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    • https://www.mynextmattress.co.uk/media/option_images/no-turn.png
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    Next Day Delivery

    From only £19.13pm

  6. 17 Day
    Harrisons Spinks Pillow Top Mattress
    Rating:
    93%

    (19)

    Harrisons Knighton 8250 Pillow Top Mattress
    Now £1,099.00 Was £2,219.00 Save £1,120.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    • https://www.mynextmattress.co.uk/media/option_images/best-selling-mattress.png
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    • https://www.mynextmattress.co.uk/media/option_images/no-turn.png
    • https://www.mynextmattress.co.uk/media/option_images/10yr.png
    17 Day Dispatch

    From only £43.00pm

  7. Next Day
    Sleepeezee Cool Rest 2400 Mattress
    Rating:
    88%

    (12)

    Sleepeezee Cool Rest 2400 Mattress
    Now £949.00 Was £1,349.00 Save £400.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
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    • https://www.mynextmattress.co.uk/media/option_images/mf.png
    • https://www.mynextmattress.co.uk/media/option_images/no-turn.png
    Next Day Delivery

    From only £37.13pm

  8. Next Day
    Hypnos Elite Ortho Support Mattress
    Rating:
    91%

    (22)

    Hypnos Elite Support Mattress
    Now £659.00 Was £1,029.00 Save £370.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
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    • https://www.mynextmattress.co.uk/media/option_images/extra-firm.png
    Next Day Delivery

    From only £25.78pm

  9. 6 Day
    Nectar Mattress Classic
    Rating:
    100%

    (10)

    Nectar Classic Memory Foam Mattress
    Now £499.00 Was £879.00 Save £380.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
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    • https://www.mynextmattress.co.uk/media/option_images/mf.png
    • https://www.mynextmattress.co.uk/media/option_images/no-springs.png
    • https://www.mynextmattress.co.uk/media/option_images/365.png
    6 Day Dispatch

    From only £19.52pm

  10. Next Day
    Sleepeezee Pocket Gel Plus Immerse 2200 Mattress
    Rating:
    90%

    (7)

    Sleepeezee Immerse PocketGel Plus 2200 Mattress
    Now £899.00 Was £1,199.00 Save £300.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    • https://www.mynextmattress.co.uk/media/option_images/10yr.png
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    Next Day Delivery

    From only £35.17pm

  11. Next Day
    Sleepeezee Poise 3200 Mattress
    Rating:
    100%

    (11)

    Sleepeezee Poise PocketGel Plus 3200 Mattress
    Now £1,049.00 Was £1,399.00 Save £350.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    • https://www.mynextmattress.co.uk/media/option_images/10yr.png
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    • https://www.mynextmattress.co.uk/media/option_images/gel.png
    • https://www.mynextmattress.co.uk/media/option_images/no-turn.png
    Next Day Delivery

    From only £41.04pm

  12. 20 Day
    Silentnight Memory Foam 1200 Spring Mattress
    Rating:
    100%

    (3)

    Silentnight 1200 Pocket Memory Mattress
    Now £429.00 Was £879.00 Save £450.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    • https://www.mynextmattress.co.uk/media/option_images/5yr-warr.png
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    • https://www.mynextmattress.co.uk/media/option_images/mf.png
    • https://www.mynextmattress.co.uk/media/option_images/no-turn.png
    20 Day Dispatch

    From only £16.78pm

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Kingsize Mattress - BOTTOM (SJ)

Kingsize Mattress - BOTTOM (SJ)

What kind of king size mattress materials and fillings are available?

King Size mattresses are available with all types of fillings and in all combinations of those. A King Size mattress is a standard UK size and is hugely popular. It canbe a daunting prospect to filter through and select from the huge choice of King Size mattresses, so we have set out the most popular types below, and you can see more information and choices in our mattress guide here.

Pocket Sprung King Size mattresses - this is the type of spring used by the top bed makers. A pocket spring will instantly and effortlessly conform to your contours, offering great support and comfort. Pocket springs are also ideal for those with restless partners, as they will prevent the mattress from moving around.

King Size Memory Foam mattresses - Memory foam is widely used in the bed world. It's a wonderfully comfortable material that will mirror the body's contours perfectly, cradling you through the night.

King Size Hybrid mattresses - the most modern of mattress types, a hybrid mattress is the blend of the traditional and the modern, the best of both worlds.

We stock mattresses from industry-leading brands

Our huge range of King Size mattresses offer a multitude of styles and brands known worldwide for their quality and innovative technology when it comes to comfort, support and overall sleep health for the body.
We have always strived to provide the best options and best deals for you and our collection features best-selling brands like Hypnos, Vispring, Harrison Spinks, Sleepeezee, Sealy, Emma, Relyon, Silentnight king size mattresses and many other mattresses from other brands.

We offer a sleep trial, where you can try your preferred mattress and if you aren’t happy, we offer an exchange! We understand how difficult it can be to find the right mattress, but as your leading mattress experts, we’re always on hand to help.

Other mattress sizes that you might be interested in

A King Size mattress is the most popular large size in the UK, second only to the Double size, which is smaller in both length and width. A King Size mattress is able to get in to most bedrooms and can be delivered with ease, unlike some of the much larger sizes. Smaller mattress sizes are still very popular but do not offer the same space and comfort at night, particularly for taller people, as a King Size mattress is 10cm longer (head to toe) than a Double size mattress. We have listed some of the other size mattresses you may be interested in below, but you can see our full mattress size guide here.

Double mattress - this is the most popular mattress size in the UK. Measuring smaller than a King Size in both width and length, it is 135cm x 190cm Vs 150cm x 200cm.

Super King Size mattress - this is the next size up. At a whopping 6 feet wide (180cm) and 6'6" (200cm) long, this mattress is large enough for most.

King Size Zip and Link - this option is the same size as a King Size, but sees the mattress split into two, then zipped together. Ideal for those with access issues.

King Size Mattress FAQs

What size is a King Size mattress?
King size mattress measurements are 150 cm X 200cm (6’ x 6’6”).

What are the different types of King Size mattresses?
Every manufacturer makes mattresses in this standard UK size. This is the second most popular size (after Double mattress) and we’re proud to be the biggest stockist of this size anywhere in the Country. King Size mattresses are available in every specification and firmness level, made to all budgets and by all suppliers.

What is the best King Size mattress?
A King Size mattress has a good amount of width, 150cm, and so this means there is ample space to move freely during sleep. As such, a strong sidewall may not be such an important consideration and this could increase the choice you have available to you.

Who is a King Size mattress best suited for?
King mattresses are the perfect size for a shared bed, or can offer a luxurious night’s sleep for single users. We would always suggest taking a quick look at the access to the bedroom to prevent problems upon delivery, as some mattresses can be very difficult to manoeuvre into the room.

Free UK Delivery

2-Person Delivery Service *

Taken to Chosen Room *

Goods Unpacked *

Packing Taken Away *

(*) on items larger than 3' Single Mattresses


Why order from us?


Our reviews are Excellent.


We have a sleep trial on all mattresses.


We offer free delivery
(offshore charges apply).


Advisers available 7-days a week.


1000’s of mattresses in stock ready
for next day delivery.

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It‘s these reasons we are rated ‘EXCELLENT‘ on Trustpilot with a rating of 4.9 out of 5.