King Size Mattresses
Shop king size mattresses at Bensons for Beds, with 5ft mattresses available in a wide range of materials, firmness ratings and price points. A standard UK king size mattress measures 150cm wide by 200cm long, giving couples more sleeping space than a double while taking up less width than a super king.
Choose from pocket sprung, memory foam, hybrid, latex and other mattress constructions, with options ranging from soft to extra firm. Whether you're replacing an existing mattress or upgrading to a larger size, compare our king size range by mattress type, firmness, price and other features to find the right fit for your sleep preferences.
What Size is a King Size Mattress?
A standard UK king size mattress measures 150cm wide by 200cm long, which is approximately 5ft wide by 6ft 6in long. A king size mattress is 15cm wider than a standard double while being the same length as a super king. Its larger sleeping surface can give couples more room without requiring as much bedroom space as a super king.
King vs Double vs Super King Mattress Sizes
- Double: 135cm × 190cm
- King size: 150cm × 200cm
- Super king: 180cm × 200cm
A king size mattress is wider and longer than a double, but narrower than a super king. For couples wanting additional sleeping space without moving up to the largest standard UK mattress size, a king can offer a useful middle ground.
Is a King Size Mattress Right for Me?
A king size mattress can be a useful choice if you want more sleeping space than a double without moving up to the width of a super king. It can work well for couples who want additional room to move during the night, as well as individual sleepers who prefer a larger sleeping surface.
Before buying, measure the bedroom and check that there is enough space around the bed for movement, furniture and access.
Which Type of King Size Mattress Should I Choose?
King size pocket sprung mattress
Pocket sprung mattresses contain individual springs that move independently, providing a responsive and supportive feel. They can be a useful option for couples because independent spring movement can help reduce movement transfer across the mattress.
King size memory foam mattress
Memory foam mattresses use pressure-responsive foam to provide a more cushioning, contouring feel. They can suit sleepers who prefer a mattress that allows more body sink and close conformity around the body.
King size hybrid mattress
Hybrid mattresses combine different technologies, commonly pocket springs with foam or other comfort layers. They can provide the responsiveness of springs alongside additional cushioning from the upper layers.
King size latex mattress
Latex mattresses use latex within the comfort or support layers and generally have a responsive, resilient feel. Latex can also be a consideration for sleepers who prefer a less sinking sensation than traditional memory foam.
What Firmness Should a King Size Mattress be?
The right firmness for a king size mattress depends on your sleeping position, body shape, weight and personal preference. Side sleepers may prefer more cushioning around the shoulders and hips, while some back and front sleepers prefer a more stable, supportive feel.
King size mattresses are available in soft, medium, medium-firm, firm and extra-firm options. Firmness ratings can vary between manufacturers, so consider the complete mattress construction rather than relying on the firmness label alone.
Which King Size Mattress is Best for My Sleeping Position?
- Side sleepers: Consider a mattress that provides enough cushioning around the shoulders and hips while still offering adequate support.
- Back sleepers: Look for a balance between support and cushioning, with enough firmness to feel stable without creating uncomfortable pressure.
- Front sleepers: A more supportive mattress may feel preferable, although the ideal firmness depends on the individual.
- Combination sleepers: A responsive mattress can make it easier to change position during the night.
Are King Size Mattresses Good for Couples?
King size mattresses can be a practical choice for couples because their 150cm width provides more sleeping space than a standard double mattress. The additional width gives each person more room to change position and move during the night.
Couples should also consider mattress construction, firmness and movement transfer. Pocket sprung and hybrid mattresses, for example, can offer different combinations of responsiveness, cushioning and movement isolation.
What if Two People Need Different Mattress Firmness?
If two people have different firmness preferences, choosing a king size mattress can require some compromise. Look for mattresses designed to provide a balanced feel, or consider models with separate comfort options where available. Zip-and-link mattresses can also provide two separate mattress sections, allowing different firmness choices on each side while retaining a king-size sleeping area.
How to Choose a King Size Mattress
- Check the dimensions: make sure 150 × 200cm fits your bedroom.
- Choose your preferred mattress type: pocket sprung, memory foam, hybrid, latex or another construction.
- Consider firmness: think about sleeping position and preferred feel.
- Consider who will use it: couples may want to prioritise movement transfer and sleeping space.
- Set a budget: compare mattresses within a price range rather than focusing on one specification.
- Check the mattress specifications: look at construction, depth, weight limits where applicable, guarantee and care requirements.
- Consider trying it: our SleepPRO system in-store can help match you with the right mattress for your needs.
King Size Mattress FAQs
What size is a king size mattress in the UK?
A standard UK king size mattress measures 150cm wide by 200cm long, which is approximately 5ft wide by 6ft 6in long. King size mattresses are wider and longer than standard double mattresses, while being narrower than super king mattresses. Always check the manufacturer's dimensions before buying, as sizes can vary slightly between countries and individual mattress designs.
Is a king size mattress bigger than a double?
Yes. A standard UK king size mattress measures 150cm × 200cm, while a standard double measures 135cm × 190cm. This means a king size mattress provides 15cm more width and 10cm more length than a double. The additional sleeping space can be particularly useful for couples, provided the bedroom has enough room for the larger mattress and bed frame.
What is the difference between a king and super king mattress?
The main difference between a king and super king mattress is width. A standard UK king size mattress measures 150cm × 200cm, while a super king measures 180cm × 200cm. Both have the same standard length, but a super king provides an additional 30cm of width. Your choice will depend on the available bedroom space and how much sleeping room you prefer.
What type of king size mattress is best?
There is no single type of king size mattress that is best for everyone. Pocket sprung mattresses offer a responsive feel, memory foam provides more cushioning and contouring, while hybrid mattresses combine different materials and technologies. Your preferred sleeping position, firmness, comfort preferences and budget can all influence which construction is most suitable. Comparing the complete mattress specification can help you choose.
Are king size pocket sprung mattresses good?
King size pocket sprung mattresses can provide a supportive and responsive sleeping surface, with individual springs designed to respond independently to pressure. This can be particularly useful for couples because movement may be less likely to travel across the mattress than with some interconnected spring systems. The overall feel still depends on the spring construction, firmness, fillings and comfort layers used.
Are king size memory foam mattresses comfortable?
King size memory foam mattresses can be comfortable for sleepers who prefer a cushioning, contouring feel. Memory foam responds to pressure and can mould more closely around the body than some traditional spring mattresses. Comfort is subjective, however, and depends on factors such as foam density, mattress firmness, sleeping position and personal preference. Some king size mattresses also combine memory foam with pocket springs.
How much does a king size mattress weigh?
The weight of a king size mattress varies considerably depending on its construction, thickness and materials. Pocket springs, memory foam, natural fillings and hybrid designs can all affect the overall weight. Rather than relying on an average figure, check the individual product specifications for the exact weight. This is particularly useful if you need to carry the mattress upstairs or move it between rooms.
How long does a king size mattress last?
A king size mattress can last for several years, although its lifespan depends on its construction, materials, usage and maintenance. Higher-quality mattresses may retain their support and comfort for longer, but no mattress lasts indefinitely. Following the manufacturer's care instructions, using a suitable bed base and rotating the mattress when recommended can help maintain its condition and extend its useful lifespan.
Why Buy a King Size Mattress from Bensons for Beds?
Customers shopping with Bensons can also benefit from:
- Flexible payment options with £0 deposit
- Up to 5 years interest-free credit
- Delivery to your room of choice
- Bed assembly services*
- Bed recycling services*
- A minimum 5-year bed guarantee
- A free SleepPro assessment**
Many Bensons mattresses are also made in the UK in British Kitemark-certified factories, giving you added confidence in quality and craftsmanship.
*Additional charges may apply.
Available in-store with our trained sleep specialists.
