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King Size Mattresses

Shop Our Kingsize Mattress Range

A Kingsize 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.

Most Popular Kingsize Mattresses
  1. Next Day
    Hypnos Elite Luxury Mattress
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    Rating:
    91%
    Hypnos Elite Luxury Mattress
    RRP £649.00 Save £259.00 Now £390.00
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    Next Day

    From only £15.26pm

  2. Next Day
    Sealy Mellbreak Mattress - Ortho Plus Collection
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    Rating:
    92%
    Sealy Mellbreak Mattress
    RRP £499.00 Save £210.00 Now £289.00
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    Next Day

    From only £11.31pm

  3. Next Day
    Firm Emma mattress
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    Rating:
    87%
    Emma Diamond Firm Mattress
    RRP £1,499.00 Save £700.00 Now £799.00
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    Next Day

    From only £31.26pm

  4. Next Day
    Buy Romantica mattresses online
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
    Rating:
    100%
    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
    Next 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. 1 Day
    Octasmart Premium Hybrid Plus Mattress
    Octasmart Premium Hybrid Plus Mattress
    Now £599.00 Was £1,249.00 Save £650.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
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    1 Day Dispatch

    From only £23.44pm

  2. 55 Day
    Relaxsan Moon Firm Mattress
    Rating:
    91%
    Relaxsan Moon Firm Mattress
    Now £239.00 Was £299.00 Save £60.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
    • Extra Firm
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    55 Day Dispatch

    From only £9.35pm

  3. 13 Day
    Emma Smart Hybrid Mattress - Buy Online
    Rating:
    100%
    Emma Smart Hybrid Mattress
    Now £559.00 Was £1,249.00 Save £690.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
    • Firm
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    13 Day Dispatch

    From only £21.87pm

  4. 55 Day
    Relaxsan Vision Mattress
    Rating:
    97%
    Relaxsan Vision Mattress
    Now £399.00 Was £449.00 Save £50.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
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    • Medium
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    55 Day Dispatch

    From only £15.61pm

  5. 55 Day
    Relaxsan Orthosoft Vision Mattress
    Rating:
    100%
    Relaxsan Orthosoft Vision Mattress
    Now £329.00 Was £479.00 Save £150.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
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    • Extra Firm
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    55 Day Dispatch

    From only £12.87pm

  6. 20 Day
    Hypnos Stratton Mattress
    Rating:
    73%
    Hypnos Wool Origins 10 Mattress
    Now £2,069.00 Was £3,299.00 Save £1,230.00
    • Firmness
    • Soft
    • Medium
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    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
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    20 Day Dispatch

    From only £80.95pm

  7. 55 Day
    Relaxsan Waterlattex Vision Deluxe Mattress
    Rating:
    88%
    Relaxsan Waterlattex Vision Deluxe Mattress
    Now £469.00 Was £749.00 Save £280.00
    • Firmness
    • Soft
    • Medium
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    • Soft
    • Medium Soft
    • Medium
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    55 Day Dispatch

    From only £18.35pm

  8. 13 Day
    Arden Elevate Ultra Mattress
    Rating:
    83%
    Sealy Arden Elevate Ultra Mattress
    Now £1,359.00 Was £2,499.00 Save £1,140.00
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    • Soft
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    • Soft
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    13 Day Dispatch

    From only £53.17pm

  9. Next Day
    Relaxsan Moon Soft Mattress
    Rating:
    75%
    Relaxsan Moon Soft Mattress
    Now £239.00 Was £299.00 Save £60.00
    • Firmness
    • Soft
    • Medium
    • Firm
    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
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    Next Day Delivery

    From only £9.35pm

  10. 20 Day
    Silentnight 1000 Pocket Mattress
    Rating:
    80%
    Silentnight Pocket 1000 Mattress
    Now £359.00 Was £649.00 Save £290.00
    • Firmness
    • Soft
    • Medium
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    • Super Soft
    • Soft
    • Medium Soft
    • Medium
    • Medium Firm
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    20 Day Dispatch

    From only £14.05pm

  11. 20 Day
    Mammoth Active Mattress
    Mammoth Active MA20 Mattress
    Now £969.00 Was £1,299.00 Save £330.00
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    • Soft
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    • Super Soft
    • Soft
    • Medium Soft
    • Medium
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    20 Day Dispatch

    From only £37.91pm

  12. 20 Day
    Mammoth Active MA30 Mattress
    Mammoth Active MA30 Mattress
    Now £1,079.00 Was £1,499.00 Save £420.00
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    • Soft
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    • Firm
    • Super Soft
    • Soft
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    • Medium
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    20 Day Dispatch

    From only £42.21pm

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Kingsize Mattresses Online

Kingsize Mattresses Online

Browse the Kingsize Mattresses Online

Our range of Kingsize 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. The collection of king size mattresses are perfect for individuals or partners who enjoy more space when it comes to sleep. Choose from traditional pocket-sprung mattresses where the springs move autonomously, or our memory foam mattresses feature customised elegance and comfort like no other – conforming to your unique body shape. Our King size mattresses come with FREE delivery and sleep trials, additionally, you can enjoy a guarantee of up to 30 years.
For Kingsize mattress brands that are loved worldwide, such as Hypnos, Octaspring and more – browse our collections in full online. We have a range that is suitable for all tastes, budgets, and comfort levels. 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.

Kingsize Mattress FAQs

What size is a Kingsize mattress?
150 cm X 200cm (6’ x 6’6”)

What are the different types of kingsize mattresses?
There are no limits! Every manufacturer makes mattresses in this size. This is the second most popular size (after Double) and we’re proud to be the biggest stockist of this size anywhere in the Country. Kingsize mattresses are available in every specification and firmness level, made to all budgets and by all suppliers.

What is the best Kingsize mattress?
A Kingsize 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 Kingsize 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.

Our Aims

Offer Best Customer Services

Accurate Unbiased Service

Give The Best Price

Keep You Informed On Order

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