King Size Mattresses

At Dormeo, we have a fantastic range of luxuriously comfy and supportive king-size mattresses (150cm x 200cm) that provide a roomier alternative to a double. Shop the range below to find your ideal style. 

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  1. Dormeo Fresh Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium/Firm
    Mattress Height: 14cm
    Dormeo Fresh Memory Foam Mattress, King
    £259.99 Was £519.99 Save £260.00
    0% Finance available
    FREE Delivery available
  2. Dormeo Fresh Plus Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium
    Mattress Height: 17cm
    Dormeo Fresh Plus Memory Foam Mattress, King
    £309.99 Was £619.99 Save £310.00
    0% Finance available
    FREE Delivery available
  3. Dormeo Fresh Deluxe Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium/Soft
    Mattress Height: 20cm
    Dormeo Fresh Deluxe Memory Foam Mattress, King
    £359.99 Was £719.99 Save £360.00
    0% Finance available
    FREE Delivery available
  4. Dormeo S Plus Evolution Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Multi
    Mattress Height: 23cm
    Dormeo S Plus Evolution Memory Foam Mattress, King
    £599.99 Was £1,199.99 Save £600.00
    0% Finance available
    FREE Delivery available
  5. Octasmart Hybrid Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium/Firm
    Mattress Height: 22cm
    Octasmart Hybrid Mattress, King
    £699.00 Was £1,399.00 Save £700.00
    0% Finance available
    FREE Delivery available
  6. Octasmart Hybrid Plus Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium
    Mattress Height: 22cm
    Octasmart Hybrid Plus Mattress, King
    £799.00 Was £1,599.00 Save £800.00
    0% Finance available
    FREE Delivery available
  7. Dormeo Memory Plus Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium
    Mattress Height: 17cm
    Dormeo Memory Plus Memory Foam Mattress, King
    £309.99 Was £779.99 Save £470.00
    0% Finance available
    FREE Delivery available
  8. Dormeo Memory Deluxe Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium/Soft
    Mattress Height: 20cm
    Dormeo Memory Deluxe Memory Foam Mattress, King
    £359.99 Was £899.99 Save £540.00
    0% Finance available
    FREE Delivery available
  9. Dormeo Aloe Vera Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium/Firm
    Mattress Height: 14cm
    Dormeo Aloe Vera Memory Foam Mattress, King
    £309.99 Was £779.99 Save £470.00
    0% Finance available
    FREE Delivery available
  10. Dormeo Aloe Vera Plus Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium
    Mattress Height: 17cm
    Dormeo Aloe Vera Plus Memory Foam Mattress, King
    £359.99 Was £899.99 Save £540.00
    0% Finance available
    FREE Delivery available
  11. Dormeo Aloe Vera Deluxe Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium/Soft
    Mattress Height: 20cm
    Dormeo Aloe Vera Deluxe Memory Foam Mattress, King
    £409.99 Was £1,029.99 Save £620.00
    0% Finance available
    FREE Delivery available
  12. Octasmart Plus Memory Foam Mattress, King
    60 night trial Free pillow
    Firmness: Medium
    Mattress Height: 17cm
    Octasmart Plus Memory Foam Mattress, King
    £999.99
    0% Finance available
    FREE Delivery available
  13. Octasmart Deluxe Memory Foam Mattress, King
    60 night trial Free pillow
    Firmness: Medium/Soft
    Mattress Height: 19cm
    Octasmart Deluxe Memory Foam Mattress, King
    £1,099.99
    0% Finance available
    FREE Delivery available
  14. Octasmart Hybrid Deluxe Mattress, King
    60 night trial Free pillow
    Firmness: Medium/Soft
    Mattress Height: 24cm
    Octasmart Hybrid Deluxe Mattress, King
    £1,799.00
    0% Finance available
    FREE Delivery available
  15. Dormeo Memory Classic Memory Foam Mattress, King
    60 night trial Free pillow
    Firmness: Medium/Firm
    Mattress Height: 14cm
    Dormeo Memory Classic Memory Foam Mattress, King
    £519.99
    0% Finance available
    FREE Delivery available
  16. Dormeo Silver Memory Foam Mattress, King
    60 night trial Free pillow
    Firmness: Medium/Firm
    Mattress Height: 14cm
    Dormeo Silver Memory Foam Mattress, King
    £779.99
    0% Finance available
    FREE Delivery available
  17. Dormeo Silver Plus Memory Foam Mattress, King
    60 night trial Free pillow
    Firmness: Medium
    Mattress Height: 17cm
    Dormeo Silver Plus Memory Foam Mattress, King
    £899.99
    0% Finance available
    FREE Delivery available
  18. Dormeo Silver Deluxe Memory Foam Mattress, King
    60 night trial Free pillow
    Firmness: Medium/Soft
    Mattress Height: 20cm
    Dormeo Silver Deluxe Memory Foam Mattress, King
    £1,029.99
    0% Finance available
    FREE Delivery available
  19. Dormeo Octasense Memory Foam Mattress, King
    Sale
    60 night trial Free pillow
    Firmness: Medium/Firm
    Mattress Height: 18cm
    Dormeo Octasense Memory Foam Mattress, King
    £599.99
    0% Finance available
    FREE Delivery available
  20. Dormeo Revitalise Memory Foam Mattress, King
    Firmness: Medium/Soft
    Mattress Height: 20cm
    Dormeo Revitalise Memory Foam Mattress, King
    £899.00
    0% Finance available
    FREE Delivery available
  21. Octaspring HYBRID Mattress, King
    60 night trial Free pillow
    Firmness: Medium/Firm
    Mattress Height: 27cm
    Octaspring HYBRID Mattress, King
    £1,449.99
    0% Finance available
    FREE Delivery available
  22. Octaspring HYBRID Plus Mattress, King
    60 night trial Free pillow
    Firmness: Medium
    Mattress Height: 27cm
    Octaspring HYBRID Plus Mattress, King
    £1,699.99
    0% Finance available
    FREE Delivery available
  23. Octaspring TRIBRID Latex Hybrid Mattress, King
    60 night trial Free pillow
    Firmness: Medium/Firm
    Mattress Height: 27cm
    Octaspring TRIBRID Latex Hybrid Mattress, King
    £1,929.99
    0% Finance available
    FREE Delivery available
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49 Products

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Frequently Asked by Our Customers

What size is a king-size mattress?

A standard king-size mattress is 150cm wide and 200cm long, or 5' x 6'6". This is 15cm wider and 10cm longer than a standard double mattress, and 60cm wider than a single mattress, meaning a king-size offers plenty of space to stretch out — perfect for taller or heavier sleepers. They’re the perfect middle ground if you like space to relax, but can't quite fit a super king-size into your room.

How much bigger is a king mattress than a queen?

A king-size mattress is 30cm wider and 10cm longer than a small double mattress, also called a queen-size mattress. Since it's so much larger, a king mattress won't fit on a queen bed frame.

Can a king-size mattress fit on a double bed?

Because a king-size mattress is much larger than a double bed, it's best to get a king-size frame if you're upgrading your current mattress. Our king-size beds provide the ideal foundation. We have a range of colours and styles, so you can find one that suits your décor. Add some of our premium king-size bedding and a mattress topper to further enhance your sleeping experience.

What is the best king-size mattress for me?

The king-size mattress that you buy will depend entirely on your sleeping position and preference. We find that side sleepers prefer a soft mattress, while back and front sleepers like something firmer. Medium-rated mattresses are often the most universal, so they're perfect for couples who sleep in different positions.

Our mattress firmness guide will outline the best mattress fillings and firmness ratings for side sleepers, back sleepers, and front sleepers.

Our King Size Mattresses

As well as being incredibly spacious, our king mattresses are exceptionally comfortable and supportive, allowing you to enjoy a luxurious night's rest. We carry this size in all of our best collections, including our Memory, Fresh, and Octaspring mattresses, so you'll be able to find the exact style that matches your sleeping needs. And, with our 60-night comfort guarantee, you’ve got a full two months to decide whether your mattress is right for you.

Should you have any questions about our king-size bed mattresses, you can get in touch with our team at [email protected] or 0800 625 0134. They'll be happy to answer your queries or provide more information.

We offer free UK tracked delivery, so order a king-size mattress from our online store today. Alternatively, take a look at some of the other mattress sizes we have on offer. Our European king-size mattresses are an extra 10cm wider. Of course, if you have enough room, you could even push the boat out with a super king mattress: the largest and most luxurious size we offer. Measuring 180cm by 200cm, they’re twice as wide as a single mattress!

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Dormeo UK Limited trading as Dormeo, is registered in England and Wales no. 07440398. Registered address: Wye House, 376 London Road, High Wycombe, Buckinghamshire, HP11 1LH. Dormeo UK Limited is Authorised and Regulated by the Financial Conduct Authority as a Consumer Credit Firm under firm number 627302. Klarna Bank AB (publ) is Authorised by the Swedish Financial Services Authority (Finansinspektionen) and is subject to limited regulation by the Financial Conduct Authority. Registered office: Sveavägen 46, 111 34 Stockholm, Sweden. Corporation ID number: 556737-0431.