Top 10 Best King Size Mattresses UK
Updated February 2025

Top 10 Best King Size Mattresses UK

You will spend a third of your life on a mattress. We are here to help you make a better choice when buying an online mattress in the UK. We provide detailed reviews of the best rated king size mattresses in 2025.

Disclosure: We receive referral fees from the brands listed below.

Our Top Choice

  • 1
    Best Hybrid
    January SALE | Up to 52% OFF
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    • Materials: Hybrid memory foam and innerspring coils
    • Firmness: Medium luxury firm
    • Shipping: Free delivery and returns
    • Trial Period: 365 days
    • Warranty: Lifetime Warranty
    • Financing: As low as 0% APR financing with DivideBuy or Klarna
    Top-quality materials for superior comfort
    • Buy now, pay later
    • Cashmere-blend quilted cover
    • Free shipping & returns
    • 365-night sleep trial & lifetime warranty
    Full Review
    9.9 Outstanding
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Side-By-Side Comparison

Best King Size Mattresses 2025
Best Hybrid
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Best Overall
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Model Dreamcloud Mattress Simba Mattress Simba Mattress Review Nectar Hybrid Mattress Nectar Mattress Hypnia Supreme Hybrid Mattress
Material Hybrid Hybrid Hybrid Hybrid Foam Hybrid
Cooling 9.5/10 9/10 7/10 9/10 8/10 7/10
Firmness 6.5/10 6.5/10 6/10 6.5/10 6.5 / 10 6.5/10
Motion Isolation 7/10 8.5/10 8/10 7/10 8/10 7/10
Trial Period 365-Night Trial 200-Nights 200-Nights 365-Night Trial 365-Night Trial 200-Night Trial
Free Shipping and Returns Yes Yes Yes Yes Yes Yes
Warranty Lifetime 10 Years 10 Years Lifetime Lifetime 15 Years
Price Level Dollar Dollar Dollar Dollar Dollar Dollar Dollar Dollar Dollar Dollar Dollar Dollar Dollar Dollar Dollar Dollar
Special Sales
January SALE | Up to 52% OFF
Winter Sale | Up to 20% OFF Selected Mattresses
Winter Sale | Up to 20% OFF Selected Mattresses
January SALE | Up to 47% OFF
January SALE | Up to 47% OFF
Winter Sale! Get Up to 65% Off
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How to Choose the Best King Size Mattress?

Buying a mattress is not something that we do regularly. Since you’re here, the chances are you’re either replacing an old and worn-out mattress or buying your first. Either way, you’re likely overwhelmed by the various brands available today. But what you’ll find even more confusing are the different mattress technologies and the jargon used in the market. In this ultimate mattress buying guide, we’ve highlighted some critical tips to guide you when choosing the best mattress to buy today.

It’s not a surprise that the king size mattress is the most popular bed in the UK. This is a mattress you’ll appreciate if you have extra floor space to spare and are looking for ultimate comfort. This easy-to-understand guide answers your questions on how to arrive at the best king size mattress for your bedroom. 

How to Choose the Best King Size Mattress?

King Size Mattress Dimensions

The size of the king mattress in the UK is 150 x 200 cm (5’0” x 6’5”). You’ll realize that the UK's king-size mattress is significantly smaller than the American version of the king-size mattress, which measures a strong 193 x 202 cm (6’3” x 6’6”). Actually, the king mattress in the UK is comparable to the US Queen mattress, which has dimensions of 152 x 202 cm (5’0” x 6’6”).
Who Should Buy the UK King Size Mattress?

The king size mattress dimensions make it the second-largest among the most common mattress sizes in the UK. Considering its length, the best king size mattress will make an incredible choice for taller people who would prefer not to have their feet hanging off the end. For shorter customers, the length of this mattress will come in handy if your dog loves sleeping by your feet in the bed. 

Width-wise, the UK king size mattress makes a solid option for couples who’d appreciate a bed with slightly more space than a double. The extra space on a king mattress allows each person extra centimeters to turn and toss comfortably without disturbing their partner. UK king size mattresses are mostly common with couples. But they are also used to sleep taller individuals who sleep alone but would use lots of room to roll around. 

What to Consider When Buying the Best King Mattress

Memory foam beds have really taken over the market and are unbeatable thanks to their next-level cradling and pressure relief. However, they tend to sleep hot and inhibit movements since they work by letting you sink in the mattress.

Latex will be a good recommendation if you want a mattress that cradles you without limiting movements. Only bear in mind that these are the priciest mattresses in the market. 

Innerspring is a popular option among people who fancy bouncy beds. These mattresses are considerably more affordable than other types and can accommodate bigger weight comfortably.
 
Hybrid mattresses combine the feel of foam mattresses with traditional innerspring beds. They balance spine support and cradling and also offer a mattress that’s breathable and more durable. But this construction design also tends to push the prices higher.

How to Choose the Best King Size Mattress?

It’s not a surprise that the king size mattress is the most popular bed in the UK. This is a mattress you’ll appreciate if you have extra floor space to spare and are looking for ultimate comfort. This easy-to-understand guide answers your questions on how to arrive at the best king size mattress for your bedroom. 

King Size Mattress Dimensions

The size of the king mattress in the UK is 150 x 200 cm (5’0” x 6’5”). You’ll realize that the UK's king-size mattress is significantly smaller than the American version of the king-size mattress, which measures a strong 193 x 202 cm (6’3” x 6’6”). Actually, the king mattress in the UK is comparable to the US Queen mattress, which has dimensions of 152 x 202 cm (5’0” x 6’6”).
Who Should Buy the UK King Size Mattress?

The king size mattress dimensions make it the second-largest among the most common mattress sizes in the UK. Considering its length, the best king size mattress will make an incredible choice for taller people who would prefer not to have their feet hanging off the end. For shorter customers, the length of this mattress will come in handy if your dog loves sleeping by your feet in the bed. 

Width-wise, the UK king size mattress makes a solid option for couples who’d appreciate a bed with slightly more space than a double. The extra space on a king mattress allows each person extra centimeters to turn and toss comfortably without disturbing their partner. UK king size mattresses are mostly common with couples. But they are also used to sleep taller individuals who sleep alone but would use lots of room to roll around. 

What to Consider When Buying the Best King Mattress

Memory foam beds have really taken over the market and are unbeatable thanks to their next-level cradling and pressure relief. However, they tend to sleep hot and inhibit movements since they work by letting you sink in the mattress.

Latex will be a good recommendation if you want a mattress that cradles you without limiting movements. Only bear in mind that these are the priciest mattresses in the market. 

Innerspring is a popular option among people who fancy bouncy beds. These mattresses are considerably more affordable than other types and can accommodate bigger weight comfortably.
 
Hybrid mattresses combine the feel of foam mattresses with traditional innerspring beds. They balance spine support and cradling and also offer a mattress that’s breathable and more durable. But this construction design also tends to push the prices higher.

Our Top Picks
for February 2025
Best Hybrid
Dreamcloud Mattress
Hybrid | 6.5/10
Dreamcloud Mattress
CHECK PRICE
January SALE | Up to 52% OFF
Best Overall
Simba Mattress
Hybrid | 6.5/10
Simba Mattress
CHECK PRICE
Winter Sale | Up to 20% OFF Selected Mattresses
Simba Mattress Review
Hybrid | 6/10
Simba Mattress Review
CHECK PRICE
Winter Sale | Up to 20% OFF Selected Mattresses