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.

50 products

30% OFF

Earth Care Mattress
From Original price was: £1092.Current price is: £764.40.
Order Now and Get by June 1, 2025
30% OFF

Bamboo Nurture 4000 Mattress
From Original price was: £1167.Current price is: £816.90.
Order Now and Get by May 18, 2025
20% OFF

Rockford Mattress
From Original price was: £1105.Current price is: £884.
Order Now and Get by May 18, 2025
Burley Mattress
From £895
Order Now and Get by May 18, 2025
Emerald Mattress
From £900
Order Now and Get by May 18, 2025
30% OFF

Flora Care Mattress
From Original price was: £1311.Current price is: £917.70.
Order Now and Get by June 1, 2025
30% OFF

Ocean Care Mattress
From Original price was: £1458.Current price is: £1020.60.
Order Now and Get by June 1, 2025
30% OFF

Bamboo Relaxation 6000 Mattress
From Original price was: £1494.Current price is: £1045.80.
Order Now and Get by May 18, 2025
30% OFF

Kelmscott 4524 Mattress
From Original price was: £1524.Current price is: £1066.80.
Order Now and Get by June 1, 2025
30% OFF

Forest Care Mattress
From Original price was: £1626.Current price is: £1138.20.
Order Now and Get by June 1, 2025
30% OFF

Wightwick 6024 Mattress
From Original price was: £1785.Current price is: £1249.50.
Order Now and Get by June 1, 2025
30% OFF

Bamboo Tranquility 8000 Mattress
From Original price was: £1818.Current price is: £1272.60.
Order Now and Get by May 18, 2025
30% OFF

Avebury 7124 Mattress
From Original price was: £1839.Current price is: £1287.30.
Order Now and Get by June 1, 2025
30% OFF

Rufford Ortho 7224 Mattress
From Original price was: £1845.Current price is: £1291.50.
Order Now and Get by June 1, 2025
20% OFF

Deluxe Ortho Mattress
From Original price was: £1665.Current price is: £1332.
Order Now and Get by May 18, 2025
Deluxe Comfort Mattress
From £1380
Order Now and Get by May 18, 2025
30% OFF

Kentwell 9624 Mattress
From Original price was: £2106.Current price is: £1474.20.
Order Now and Get by June 1, 2025
30% OFF

Howfield 8024 Mattress
From Original price was: £2139.Current price is: £1497.30.
Order Now and Get by June 1, 2025
30% OFF

Deluxe Natural Mattress
From Original price was: £2140.Current price is: £1498.
Order Now and Get by May 18, 2025
30% OFF

Carborne Ortho 13424 Mattress
From Original price was: £2691.Current price is: £1883.70.
Order Now and Get by June 1, 2025
30% OFF

Sheldon 12224 Mattress
From Original price was: £2721.Current price is: £1904.70.
Order Now and Get by June 1, 2025
30% OFF

Gosfield 16024 Mattress
From Original price was: £2940.Current price is: £2058.
Order Now and Get by June 1, 2025
Deluxe Gel Mattress
From £2140
Order Now and Get by May 18, 2025
Bamboo Breathe 6000 Mattress
£2217
Order Now and Get by May 18, 2025

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

Earth Care Mattress

Bamboo Nurture 4000 Mattress

Rockford Mattress

Burley Mattress

Emerald Mattress

Flora Care Mattress

Ocean Care Mattress

Bamboo Relaxation 6000 Mattress

Kelmscott 4524 Mattress

Forest Care Mattress

Wightwick 6024 Mattress

Bamboo Tranquility 8000 Mattress

Avebury 7124 Mattress

Rufford Ortho 7224 Mattress

Deluxe Ortho Mattress

Deluxe Comfort Mattress

Kentwell 9624 Mattress

Howfield 8024 Mattress

Deluxe Natural Mattress

Carborne Ortho 13424 Mattress

Sheldon 12224 Mattress

Gosfield 16024 Mattress

Deluxe Gel Mattress

Bamboo Breathe 6000 Mattress

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