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King Size Mattresses

Looking for the perfect king size mattress? Look no further! Our extensive range of king size mattresses offers unparalleled comfort and support to ensure a restful night's sleep. Popular among those who prefer extra room in bed, king size mattresses measure 5 feet in width and 6 feet 6 inches in length (150 x 200 mattress). Being one foot narrower than a super king-size mattress and six inches wider than a double mattress, they are an ideal size for individuals who desire plenty of sleeping space or share a bed with a partner. Additionally, it accommodates children who join their parents in bed or pets that prefer to snuggle at the foot of the bed. With a king-size mattress, there's space for everyone! Whether you prefer memory foam, pocket sprung, or hybrid options, we have the perfect mattress to suit your needs. With our affordable prices and exceptional customer service, we make finding the perfect mattress easy and stress-free. Explore our collection today and upgrade your sleep experience with our king size mattresses!

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Soft King Size MattressesMedium King Size MattressesFirm King Size MattressesExtra Firm King Size MattressesMemory Foam King Size MattressesPocket Spring King Size Mattresses
Showing (1 to 12) of 520 Products
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Awards-Best-Seller
Hypnos Premier Deluxe King Size Mattress

HYPNOS Premier Deluxe King Size Mattress

4.9/5
(53 reviews)
£999Save £270RRP £1,269Was £1,099
From £333.00 per month
From £31.99 per month
  • Natural Filling
  • ReActive 8 Pocket Spring
  • 10 Year Guarantee
  • Free Size Upgrade
Medium
Removal and Recycle Available
FREE Delivery within 4 Weeks
Awards-Special-Buy
Mattress-Trial-60-Nights-sized
Sleepeezee Ortho Visco Memory King Size Mattress

SLEEPEEZEE Ortho Visco Memory King Size Mattress

4.9/5
(17 reviews)
£899Save £300RRP £1,199Was £949
From £299.67 per month
From £28.79 per month
  • Memory Foam Filling
  • 2025 Pocket Spring
  • 10 Year Guarantee
Medium
Removal and Recycle Available
FREE Delivery within 3 Weeks
Awards-Expert-Choice
Relyon Stratus Dunlopillo Latex King Size Mattress

RELYON Stratus Dunlopillo Latex King Size Mattress

5.0/5
(8 reviews)
£949Save £470RRP £1,419Was £1,049
From £316.34 per month
From £30.39 per month
  • Latex Filling
  • 1050 Pocket Spring
  • 10 Year Guarantee
  • Free Size Upgrade
Medium
Removal and Recycle Available
FREE Delivery within 5 Weeks
Awards-Best-Seller
Mattress-Trial-200-Nights-sized
Emma One King Size Mattress

EMMA One King Size Mattress

4.8/5
(95 reviews)
£319Save £80RRP £399Was £349
From £106.34 per month
From £10.22 per month
  • Memory Foam Filling
  • Non Sprung
  • 10 Year Guarantee
Medium
FREE Delivery in 14 Days
Good-Housekeeping-24
Simba Hybrid Original King Size Mattress

SIMBA Hybrid Original King Size Mattress

£749Save £500RRP £1,249Was £1,099
From £249.67 per month
From £31.99 per month
  • Memory Foam Filling
  • 2500 Pocket Spring
  • 10 Year Guarantee
  • Free Size Upgrade
Medium Firm
Removal and Recycle Available
FREE Delivery in 5 Days
Mattress-Trial-60-Nights-sized
Sleepeezee Dual Seasons King Size Mattress

SLEEPEEZEE Dual Seasons King Size Mattress

4.9/5
(33 reviews)
£759Save £190RRP £949Was £809
From £253.00 per month
From £24.30 per month
  • Natural Filling
  • 1015 Pocket Spring
  • 10 Year Guarantee
  • Free Size Upgrade
Medium
Removal and Recycle Available
FREE Delivery within 3 Weeks
Awards-Best-Seller
Mattress-Trial-100-Nights-sized
Sealy Caldwell King Size Mattress

SEALY Caldwell King Size Mattress

4.8/5
(15 reviews)
£439Save £340RRP £779Was £549
From £146.34 per month
From £15.66 per month
  • PostureTech™ Core Support Spring
  • 5 Year Guarantee
  • Free Size Upgrade
Extra Firm
Removal and Recycle Available
FREE Delivery in 14 Days
Awards-Expert-Choice
Hypnos Ortho Gold King Size Mattress

HYPNOS Ortho Gold King Size Mattress

5.0/5
(18 reviews)
£999Save £650RRP £1,649Was £1,249
From £333.0 per month
From £38.39 per month
  • Natural Filling
  • ReActive 8 Pocket Spring
  • 10 Year Guarantee
  • Free Size Upgrade
Firm
Removal and Recycle Available
FREE Delivery within 4 Weeks
Smart-mattress---AUGUST-2023-sized
Emma Smart Hybrid King Size Mattress

EMMA Smart Hybrid King Size Mattress

4.7/5
(33 reviews)
£619Save £630RRP £1,249Was £999
From £206.34 per month
From £28.15 per month
  • Memory Foam Filling
  • Pocket Spring
  • 10 Year Guarantee
Medium
FREE Delivery in 14 Days
Awards-Special-Buy
Mattress-Trial-60-Nights-sized
Dormeo Octasmart Premium Plus King Size Mattress

DORMEO Octasmart Premium Plus King Size Mattress

4.8/5
(43 reviews)
£499Save £280RRP £779Was £549
From £166.34 per month
From £16.62 per month
  • Memory Foam Filling
  • Octaspring
  • 18 Year Warranty
  • Free Size Upgrade
Medium
FREE Delivery in 3 to 5 Days
Awards-Best-Seller
Good-Housekeeping-Getting-Greener
Silentnight Amelia King Size Mattress

SILENTNIGHT Amelia King Size Mattress

4.7/5
(74 reviews)
£539Save £270RRP £809Was £669
From £179.67 per month
From £19.18 per month
  • Eco Fibre Filling
  • 1216 Mirapocket Springs
  • 5 Year Guarantee
  • Free Size Upgrade
Medium Firm
Removal and Recycle Available
FREE Delivery in 14 Days
Awards-Highly-Rated
Relyon Tarporley King Size Mattress

RELYON Tarporley King Size Mattress

4.7/5
(90 reviews)
£599Save £160RRP £759Was £699
From £199.67 per month
From £20.46 per month
  • Memory Foam Filling
  • 1500 Pocket Spring
  • 10 Year Guarantee
  • Free Size Upgrade
Medium
Removal and Recycle Available
FREE Delivery within 5 Weeks
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Showing 1 to 12 of 520 Products

Explore Our King Size Mattresses for Premium Comfort and Space

We sell a wide range of king mattresses including:

  • Natural King Size Mattresses. These supply a sumptuous sleeping surface, which regulates your body temperature as you sleep. Offering a hypoallergenic sleep surface, this filling type is ideal for people with allergies.
  • Latex King Size Mattresses are an ideal choice for sleepers with allergies and respiratory difficulties. Latex is extremely responsive, supplying excellent pressure relief as you sleep.
  • Foam King Size Mattresses are a smart choice for restless sleepers. The foam contours to your body as you sleep, supplying great comfort.
  • Memory Foam King Size Mattresses absorb motion making them a wise choice for co sleepers. Weight is evenly distributed as you sleep delivering excellent pressure relieving properties and spinal support.
  • Gel King Size Mattresses are fantastic at regulating temperature. They are an excellent choice for sleepers experiencing aches and pains as gel offers elevated levels of comfort and support.

See our mattress filling guide for further information.

We also have king size mattresses with a range of different spring options available:

  • Pocket Spring King Size Mattresses offer elevated levels of personalised support. They are beneficial to co-sleepers who are different weights. As the individual pocket springs work independently of each other, only responding to the pressure applied in that area, this type of spring choice can be hugely beneficial to co-sleepers where one is a restless sleeper.
  • Traditional Spring King Size Mattresses - often called open coil/Bonnell spring offer immense value for money. Interconnected springs work together to evenly distribute weight across the mattress, ensuring no single body part takes the brunt of the pressure as you sleep.

Additional information

Our team of award-winning bed experts are on hand to help your find the king size mattress of your dreams and to help you achieve a good night’s sleep, night after night. Speak to one of our bed experts today on: 01928 242829 or email us. Alternatively, use the chat feature on our website or pop into one our stores where a warm welcome awaits.

Questions & Answers

  • What size is a king size mattress?

    King size mattresses measure 5' x 6'6" (150 cm x 200 cm).

  • How big is a king size mattress compared to a standard double mattress?

    A double mattress measures 4'6" x 6'3"(135cm x 190cm) while a king size mattress measures 5'0" x 6'6" (150cm x 200cm). This makes a king size mattress 15cm wider and 10cm longer than a standard double mattress.

  • How wide is a king size bed?

    A king size mattress is 5'0" (150cm) in width.

  • How long is a king size bed?

    A king size mattress measures 6'6" (200cm) in length.

  • What is the average life of a king size mattress?

    A decent quality king size mattress, if cared for properly, can last for many years. The National Bed Federation recommend replacing your mattress every 7-8 years.

  • Is a king size like a Queen size mattress?

    The term Queen size refers to an American mattress measuring 4’ 9” x 6’ 6” (152cm x 203cm). A king size mattress is the closest UK equivalent. If you are looking for a queen size mattress, then a king size mattress is the closest match you can find here in the UK. This is because the term ‘queen’ is an American mattress size, which measures 152cm x 203cm (or 60" x 80" in imperial measurements).

  • Is a king size mattress big enough for two people?

    Yes, a king size mattress is designed to comfortably sleep two people.

  • What is the best king size mattress?

    The ‘best’ king size mattress is one that suits your own sleep needs. Our panel of bed experts have selected a range of highly commended products, found on our website by the expert choice award logo.

  • What should I look for when buying?

    Sleep needs, comfort grade, mattress filling and type, price, and room size should all be considered when buying a new king size mattress. Our award-winning team are at the end of a phone to answer any questions you might have. Give them a call on 01928 242829 for free, independent advice.

  • Will a king size mattress fit in my boot?

    Please bear in mind that most cars are not designed to transport king size mattresses and incorrect handling of your mattress may result in your warranty becoming void. Let us take the hassle away for you and deliver your goods via our free delivery service (T&C apply).

  • How can I dispose of my old mattress?

    We can take your old mattress away for you. Simply select our mattress removal and recycle service when buying your new product and we will do the rest!

  • Can I get a new king size mattress on finance?

    Yes, you absolutely can get king size mattresses on finance at Land of Beds, providing you are spending more than £250. We have a variety of interest-free credit and pay monthly options to help you do so. We also offer payment options through Klarna on orders over £35.

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