King Size Mattresses
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A king size mattress gives you 15cm more width and 10cm more length than a double, so couples get real room to move and taller sleepers aren’t left with their feet over the edge. It measures 150 x 200cm (5ft x 6ft 6in) and fits any standard UK king size bed frame. Choose memory foam, pocket sprung or hybrid in the firmness you prefer.
What Size is a King Size Mattress?
UK king size mattress dimensions measure 150cm wide by 200cm long (5ft x 6ft 6"). This makes it 15cm wider and 10cm longer than a double mattress, providing noticeably more sleeping space for couples or solo sleepers who prefer room to move. If you need even more space, consider our super king mattresses at 180cm x 200cm. Read our mattress size guide for more help and advice.
Will a King Size Mattress Fit My Bed Frame?
A king size mattress fits any standard UK king size bed frame, whether it's a divan, ottoman, or bedstead. Always check your bed frame's internal dimensions match 150cm x 200cm before ordering. Keep in mind that the bed frame itself may be slightly larger, depending on its style, so measure your bedroom space accordingly. We recommend leaving at least 60cm clearance on each side for easy access.
How Heavy Is a King Size Mattress?
Weight depends on the materials used. Memory foam and hybrid mattresses tend to be heavier than pocket sprung or open coil designs, thanks to their extra foam layers. We recommend having at least two people when moving a king size mattress due to their heavy weight, especially when navigating stairs and corners.
What Types of King Size Mattresses Do You Offer?
We have a king size mattress in every comfort type to suit how you sleep:
- Memory Foam King Size Mattress - Contours to your body shape for pressure relief and minimal motion transfer, ideal for couples and those with joint pain.
- Pocket Sprung King Size Mattress - Individually wrapped springs respond independently to movement, providing targeted support and reducing partner disturbance.
- Open Coil King Size Mattress - Traditional interconnected spring system offering reliable support at a budget-friendly price.
- Hybrid King Size Mattress - Combines memory foam comfort layers with pocket spring support for the best of both worlds.
- Latex King Size Mattress - Naturally breathable and responsive with a cooler sleep surface, great for hot sleepers.
- Gel King Size Mattress - Infused with cooling gel particles to regulate temperature throughout the night.
- Orthopaedic King Size Mattress - Firmer construction designed to promote proper spinal alignment, particularly suited to back sleepers and those with back pain.
- Eco-Friendly King Size Mattress - Made from sustainable and natural materials for comfort without compromising on environmental responsibility.
Our mattress buying guide gives you even more advice on finding your perfect type.
What Is the Best King Size Mattress?
The best king size mattress depends on how you sleep, your firmness preference and whether you need extra pressure relief. Side sleepers often prefer softer options like memory foam, while back and front sleepers tend to find pocket sprung king size mattresses more supportive.
What Firmness Levels Do King Size Mattresses Come In?
Our king size mattresses come in comfort levels from soft to firm. The right firmness depends on your sleeping position and personal preference. Here's a quick guide:
- Soft King Size Mattress - Best for side sleepers who need cushioning around shoulders and hips; provides gentle contouring and pressure point relief.
- Medium Firm King Size Mattress - Suits most sleepers and sleeping positions; balances cushioning comfort with supportive structure to maintain spinal alignment.
- Firm King Size Mattress - Ideal for back sleepers, front sleepers, and those with lower back pain; offers a stable surface with minimal sinkage.
Not sure which firmness to choose? As a general rule, side sleepers tend to prefer softer mattresses, back sleepers suit medium-firm, and front sleepers often need firmer support. Your body weight also plays a role - heavier sleepers typically benefit from firmer options.
How Much Does a King Size Mattress Cost?
Cost depends on the mattress type, the materials inside it and the comfort technology used. Open coil and pocket sprung king size mattresses generally sit at the lower end, while memory foam and hybrid king size mattresses cost more due to their added layers. A good king size mattress can range from around £200 to £1,000+, so there are options to suit different budgets.
How Soon Can You Deliver My King Size Mattress?
Most of our king size mattresses are dispatched within a few working days, though timings vary by product, so check the specific delivery estimate on the mattress page before you order. All our king size mattresses include free UK delivery to most areas in England, Scotland, and Wales, and many arrive rolled and vacuum-packed for easier handling through doorways and up stairs. We also offer 0% APR finance on approved credit, helping you spread the cost of your perfect night's sleep.
Do you have more queries about our king size mattresses? If so, don't hesitate to ask. Our contact form is a great way to get in touch with our experts.