King Size Mattresses – 5ft Mattresses

Our king size mattresses measure 5ft wide and 6ft 6 inches long. King size mattresses are considerably larger than our double mattresses, making them ideal for couples who like to sprawl out in the bed or just like to get their own space when sleeping. From memory foam to pocket sprung, we offer a variety of 5ft king size mattresses to suit your preferences. Browse the full range of 5ft mattresses below.

5’0″ King Size Snooze Easy Mattress
was

£440
Now

£440
5’0″ King Size Snooze Rest Mattress
was

£530
Now

£530
5’0″ King Size Zircon Mattress
was

£1,060
Now

£1,060
5’0″ King Size Cosy Nap Mattress
was

£722
Now

£722
5’0″ King Size Snooze Calm Mattress
was

£650
Now

£650
5’0″ King Size Cosy Slumber Mattress
was

£730
Now

£730
5’0″ King Size Gel Essence Ortho Mattress
was

£1,125
Now

£788
5’0″ King Size Morion 2000 Mattress
was

£1,470
Now

£1,470
5’0″ King Size Citrine Mattress
was

£1,160
Now

£580
5’0″ King Size Gel Essence Comfort Mattress
was

£1,065
Now

£746
5’0″ King Size Amethyst Mattress
was

£1,090
Now

£763
5’0″ King Size Melbury Mattress
was

£1,320
Now

£792
5’0″ King Size Ironstone 2000 Mattress
was

£1,440
Now

£1,008
5’0″ King Size Amatrix Mattress
was

£1,620
Now

£810
5’0″ King Size Rosaline Mattress
was

£1,120
Now

£896
5’0″ King Size Pocket Superior 4000 Mattress
was

£1,360
Now

£1,360
5’0″ King Size Hinton Mattress
was

£1,745
Now

£1,047
5’0″ King Size Diamond 5500 Mattress
was

£3,650
Now

£2,555
5’0″ King Size Cosy Siesta Mattress
was

£555
Now

£555
5’0″ King Size Duke Comfort Mattress
was

£260
Now

£260
5’0″ King Size Duke Ortho Mattress
was

£260
Now

£260
5’0″ King Size Jade Mattress
was

£2,030
Now

£2,030
5’0″ King Size Gel Plush Comfort Mattress
was

£1,419
Now

£993
5’0″ King Size Gel Plush Ortho Mattress
was

£1,470
Now

£1,029
5’0″ King Size Rockford Mattress
was

£1,450
Now

£1,015
6’0″ Super King Deluxe Gel Mattress
was

£2,827
Now

£1,696
5’0″ King Size Burley Mattress
was

£1,230
Now

£984
5’0″ King Size Bedstead Emerald Mattress
was

£1,335
Now

£1,068
5’0″ King Size Ruby 2000 Mattress
was

£1,970
Now

£985
5’0″ King Size Bamboo Fresh 4000 Mattress
was

£2,085
Now

£1,043
5’0″ King Size Kelmscott 4524 Mattress
was

£2,061
Now

£1,649
5’0″ King Size Deluxe Ortho Mattress
was

£1,943
Now

£1,360
5’0″ King Size Deluxe Natural Mattress
was

£2,368
Now

£1,421
5’0″ King Size Deluxe Comfort Mattress
was

£1,688
Now

£1,350
5’0″ King Size Bamboo Breathe 6000 Mattress
was

£2,559
Now

£1,280
King Size Wightwick 6024 Mattress
was

£2,466
Now

£1,973
5’0″ Kelmscott 4524 Zipped Mattress (2 x 75cm x 200cm)
was

£2,499
Now

£1,999
King Size Avebury 7124 Mattress
was

£2,550
Now

£2,040
5’0″ King Rufford Ortho 7224 Mattress
was

£2,643
Now

£2,114
5’0″ King Size Bamboo Aura 8000 Mattress
was

£2,832
Now

£1,416
5’0″ King Size Moonstone Pocket Mattress
was

£2,930
Now

£1,465
King Size Kentwell 9624 Mattress
was

£2,919
Now

£2,335
Wightwick 6024 Zipped Mattress (2 x 75cm x 200cm)
was

£2,949
Now

£2,359
King Size Howfield 8024 Mattress
was

£2,952
Now

£2,362
Avebury 7124 Zipped Mattress (2 x 75cm x 200cm)
was

£2,862
Now

£2,862
5’0″ King Rufford Ortho 7224 Zipped Mattresses (2 x 75cm x 200cm)
was

£3,138
Now

£2,510
5’0″ King Size Sapphire 1500 Mattress
was

£2,350
Now

£1,880
Kentwell 9624 Zipped Mattress (2 x 75cm x 200cm)
was

£3,435
Now

£2,748
Howfield 8024 Zipped Mattress (2 x 75cm x 200cm)
was

£3,486
Now

£2,789
5’0″ King Carborne Ortho 13424 Mattress
was

£3,858
Now

£3,086
5’0″ King Size Sheldon 12224 Mattress
was

£3,771
Now

£3,017
5’0″ King Size Gosfield 16024 Mattress
was

£4,074
Now

£3,259
5’0″ King Carborne Ortho 13424 Zipped Mattresses (2 x 75cm x 200cm)
was

£4,476
Now

£3,581
5’0″ Sheldon 12224 Zipped Mattress (2 x 75cm x 200cm)
was

£4,377
Now

£3,502
5’0″ Gosfield 16024 Zipped Mattress (2 x 75cm x 200cm)
was

£4,716
Now

£3,773
5’0″ King Size Harlington 26224 Mattress
was

£5,712
Now

£4,570
5’0″ Harlington 26224 Zipped Mattress (2 x 75cm x 200cm)
was

£6,519
Now

£5,215
5’0” Kingsize Blenheim VIP 35000 Mattress
was

£10,791
Now

£8,633
See More King Mattresses

What size is a king size mattress?

A king size mattress measures 5 feet wide (150cm) and 6ft 6 inches long (200cm), making it 6 inches wider and 3 inches longer than a regular double mattress. They are ideal for bedrooms with large floor spaces. The king size mattress comes in a variety of depths depending on the comfort level you choose and whether you opt for a pocket sprung, memory foam or hybrid mattress.

Are all king mattresses the same size?

Yes, all king size mattresses should measure 5ft x 6ft 6inches. If the mattress is smaller than this, it’s likely a double mattress. If the mattress is larger than this, it’s likely a super king size mattress, which measures 6ft x 6ft 6 inches.

Can a king size mattress fit on a double bed?

While a king size mattress can technically fit on top of a double bed frame, we strongly advise against it. The king size mattress is both longer and wider than a double bed frame, so the mattress will stick over the edge and will be unstable to sleep on. If you need a matching bed frame, we have a variety of king size frames and king size divan sets available.

What is a good king size mattress?

A good king size mattress is one that provides long lasting comfort and a good night’s sleep. This will be different for many people, depending on their preferences, body type and any health conditions.

Pocket sprung king size mattresses - Ideal for those who often wake up with an aching neck or back, pocket springs shape themselves around your body for maximum support. We offer pocket sprung mattresses with anywhere between 1,000 and 35,000 pocket springs. 

Memory foam king size mattresses - If you want your mattress to mould to the contours of your body, our memory foam king size mattresses do just that, returning to their original shape when you get off the bed.

Hybrid king size mattresses - Why not get the best of both worlds with a hybrid king size mattress which utilises memory foam technology to remember the shape of your body and pocket springs to provide ultimate support.

You’ll also want to consider how firm you need your mattress. We offer firmness gradings from 1 (soft) to 5 (extra firm) so that you can find the perfect king size mattress for you.

Buy 5ft mattresses and more with Sussex Beds

Browse our full range of king size mattresses online or check out our king size divan beds and king size divan bases. UK delivery, assembly service and disposal of existing furniture services available.