King Size Mattresses - 5ft Mattresses

Our king size mattresses measure 5ft wide and 6ft 6 inches long or 150cm by 200cm. 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.

73 products

Nova Soothe Mattress – King
Original price was: £1293.Current price is: £1034.40.
Ebony Natural Mattress – King
Original price was: £1750.Current price is: £1050.
Order Now and Get by April 10, 2026
Jet Memory Mattress – King
Original price was: £1750.Current price is: £1050.
Order Now and Get by April 10, 2026
Gel Essence Ortho Mattress – King
Original price was: £1329.Current price is: £1063.20.
Order Now and Get by April 10, 2026
Nova Ortho Mattress – King
Original price was: £1359.Current price is: £1087.20.
Zircon Mattress – King
£1115
Ironstone Mattress – King
Original price was: £1505.Current price is: £1204.01.
Rockford Mattress – King
Original price was: £1575.Current price is: £1260.
Aura Essence Mattress – King
Original price was: £1592.50.Current price is: £1273.99.
Nectus Pure Support Mattress – King
Original price was: £1665.Current price is: £1332.
Gel Plush Comfort Mattress – King
Original price was: £1677.Current price is: £1341.60.
Burley Mattress – King
£1350
Deluxe Gel Mattress – King
Original price was: £2750.Current price is: £1375.01.
Nectus Pure Soothe Mattress – King
Original price was: £1720.Current price is: £1375.99.
Gel Plush Ortho Mattress – King
Original price was: £1737.Current price is: £1389.60.
Order Now and Get by April 10, 2026
Aura Support Mattress – King
Original price was: £1820.Current price is: £1456.01.
Nectus Pure Serene Mattress – King
Original price was: £1850.Current price is: £1480.01.
Bamboo Nurture 4000 Mattress – King
Original price was: £1977.Current price is: £1482.76.
Aura Ortho Mattress – King
Original price was: £1911.Current price is: £1528.80.
Earth Care Mattress – King
Original price was: £1984.34.Current price is: £1587.48.
Amatrix Mattress – King
£1715
Aura Cloud Mattress – King
Original price was: £2184.Current price is: £1747.20.
Flora Care Mattress – King
Original price was: £2231.17.Current price is: £1784.94.
Deluxe Ortho Mattress – King
Original price was: £2250.Current price is: £1800.
Kelmscott 4524 Mattress – King
Original price was: £2393.05.Current price is: £1914.44.
Asteria 4768 Mattress – King
Original price was: £2403.50.Current price is: £1922.81.
Deluxe Natural Mattress – King
Original price was: £2750.Current price is: £1925.

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.

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.

Shopping Basket

Nova Soothe Mattress – King

Ebony Natural Mattress – King

Jet Memory Mattress – King

Gel Essence Ortho Mattress – King

Nova Ortho Mattress – King

Zircon Mattress – King

Ironstone Mattress – King

Rockford Mattress – King

Aura Essence Mattress – King

Nectus Pure Support Mattress – King

Gel Plush Comfort Mattress – King

Burley Mattress – King

Deluxe Gel Mattress – King

Nectus Pure Soothe Mattress – King

Gel Plush Ortho Mattress – King

Aura Support Mattress – King

Nectus Pure Serene Mattress – King

Bamboo Nurture 4000 Mattress – King

Aura Ortho Mattress – King

Earth Care Mattress – King

Amatrix Mattress – King

Aura Cloud Mattress – King

Flora Care Mattress – King

Deluxe Ortho Mattress – King

Kelmscott 4524 Mattress – King

Asteria 4768 Mattress – King

Deluxe Natural Mattress – King

What size is a king size mattress?

Are all king mattresses the same size?

Can a king size mattress fit on a double bed?

What is a good king size mattress?

Buy 5ft mattresses and more with Sussex Beds