Guide to Choosing the Best King Size Mattress for Better Sleep

Choosing the right mattress can make a world of difference to your sleep quality and a king size mattress is often the gold standard for those who prioritise space, support, and luxury. But with so many options on the market, how do you choose the best king size mattress for your sleep needs?

In this in-depth 2025 guide, we’ll cover everything from dimensions and benefits to detailed buying tips and top Luxe Mattress recommendations, designed to help you sleep cooler, deeper, and better every night.

What Is a King Size Mattress?

A king-size mattress (150cm x 200cm)  is one of the most spacious and luxurious bed sizes available on the market today. Known for its generous width and extended length, a king size bed is designed to accommodate couples, co-sleeping parents, or individuals who simply prefer extra room while they sleep. Its ample dimensions make it a popular choice in master bedrooms and homes where space is not a constraint.

The standard UK king size mattress measures 150 cm wide by 200 cm long (5 feet by 6 feet 6 inches). This size provides significant room for two adults to sleep comfortably without disturbing one another, which is especially useful for light sleepers or those with different bedtime routines.

But not all king mattresses are created equal. Different countries have different standards for what qualifies as a “king,” and the dimensions vary considerably. Here’s how the UK king compares to other common regional king mattress types:

King Size Mattress Dimensions Around the World

1. United Kingdom (UK) – Standard King Size Mattress

• Dimensions: 150 cm x 200 cm (59” x 79”)
• Best For: Couples or tall solo sleepers in master bedrooms
• Notes: The most common king size in the UK. Distinct from the UK Super King, which measures 180 cm x 200 cm.

2. United States – Standard King Size Mattress (Eastern King)

• Dimensions: 76” x 80” (193 cm x 203 cm)
• Best For: Couples who want extra width
• Notes: The US king is wider but slightly shorter than the UK Super King. Very popular in North American households.

3. United States – California King Size Mattress

• Dimensions: 72” x 84” (183 cm x 213 cm)
• Best For: Taller individuals who need extra legroom
• Notes: Offers less width than a standard US king, but adds more length. Ideal for taller users.

4. Canada – King Size Mattress

• Dimensions: 76” x 80” (193 cm x 203 cm)
• Best For: Similar to US King; offers ample space for couples or families
• Notes: Canadian king sizes usually follow American sizing standards.

5. Australia – King Size Mattress

• Dimensions: 183 cm x 203 cm (72” x 80”)
• Best For: Couples, families, or those who prefer spacious sleeping areas
• Notes: Slightly wider than the UK king; comparable to the US California King in width but not length.

6. Europe – Euro King Size Mattress

• Dimensions: 160 cm x 200 cm (63” x 79”)
• Best For: Couples looking for a wider option than the UK king
• Notes: Slightly wider than the UK version. Bedding and frame compatibility can vary across European countries.

Different King Size Mattresses Comparison

Region	Type	Dimensions (cm)	Dimensions (inches)	Notes
UK	King	150 x 200	59 x 79	Standard UK king
UK	Super King	180 x 200	71 x 79	Larger than standard UK king
USA/Canada	Standard King	193 x 203	76 x 80	Known as Eastern King in USA
USA	California King	183 x 213	72 x 84	Narrower but longer
Australia	King	183 x 203	72 x 80	Similar to US king
Europe	Euro King	160 x 200	63 x 79	Slightly wider than UK king

Why You Should Upgrade to a King Size Mattress (And Whether It’s Truly Necessary)

If you’re currently sleeping on a double, full, or queen mattress, you may not realize what you’re missing until you try a king size mattress. It’s not just about having a bigger bed, it’s about creating the ideal sleep environment that supports better health, improved comfort, and deeper rest.

But is it truly necessary to make the switch? Let’s explore why upgrading to a king mattress could be the best sleep investment you make, and how to know if it’s right for you.

The Hidden Downsides of Smaller Mattresses

Sleeping on a smaller mattress can cause issues you may not consciously notice:

• 1. Restricted movement – If you’re a restless sleeper or share the bed, tight space can result in disturbed sleep.
• 2. Poor spinal alignment – Limited surface area may cause you to curl unnaturally, especially if you’re tall.
• 3. Overheating – Sleeping close to a partner on a tight surface can trap heat and lead to night sweats.
• 4. Interrupted sleep – Lack of motion isolation means you’ll feel every movement your partner makes.
• 5. Less relaxation space – Reading, watching TV, or lounging in bed becomes cramped and less enjoyable.

Why a King Size Mattress Changes Everything

Upgrading to a king size mattress can transform your sleep experience almost overnight. Here’s how:

• Extra Room for Better Sleep A UK king size mattress (150cm x 200cm) gives each sleeper plenty of personal space to stretch out without bumping into the other.
• Minimised Sleep Disruption With more room to move, you’re less likely to be disturbed by your partner’s tossing, turning, or late-night bathroom trips.
• Ideal for Families or Pets If your child or pet sneaks into bed, a king mattress comfortably accommodates the entire family without crowding.
• Better for Health and Posture A larger mattress allows more freedom in changing positions, which reduces pressure points and supports better spinal alignment.
• Improved Sleep Quality Less disturbance and better posture mean deeper sleep stages, more restorative rest, and better morning energy.
• Enhanced Bedroom Aesthetic A king bed makes a statement, it’s a luxurious centrepiece that elevates the look and feel of your entire room.

Pros of a King Size Mattress

1. Ample Sleeping Space for Ultimate Comfort

A standard UK king size mattress measures 150 cm x 200 cm, offering generous space for both individuals and couples. Unlike smaller beds where space is compromised, a king mattress allows you to fully stretch, turn, and reposition without encroaching on your partner’s side. This spacious design is especially beneficial for those who move frequently during sleep or prefer not to feel confined.

2. Ideal for Families and Pets

If you have young children who like to crawl into bed occasionally or a furry pet that sleeps by your side, a king size mattress comfortably accommodates everyone without sacrificing your personal space. The added width ensures that you, your partner, and an occasional visitor (furry or human) can all share the bed without feeling overcrowded.

3. Enhanced Postural and Orthopaedic Support

Most high-quality king mattresses come with advanced support systems, such as zoned coil layers or memory foam technologies. These features are engineered to relieve pressure on key areas like the lower back, shoulders, and hips. For individuals dealing with joint pain, back problems, or general discomfort, this extra support can significantly improve sleep quality and reduce nighttime aches.

4. Superior Motion Isolation

If your partner tosses and turns throughout the night or if you’re a light sleeper, a king mattress with motion isolation technology can be a game changer. Many king-size mattresses feature individually pocketed coils or advanced memory foams that absorb and isolate motion, so one person’s movements don’t ripple across the entire bed.

5. Long-Term Durability and Shape Retention

Thanks to their premium construction, king-size mattresses are often made with reinforced edge support and high-density foam layers, helping them resist sagging and deformation over time. Whether you sleep in the centre or closer to the edges, the mattress maintains consistent firmness and structural integrity, offering lasting value.

6. Luxurious Aesthetic for Larger Bedrooms

From a visual standpoint, a king-size bed can instantly elevate the look of your bedroom. It becomes a luxurious centrepiece that complements spacious interiors, offering both form and function. Paired with the right headboard and bedding, a king-size setup communicates comfort, elegance, and modern living.

Cons of a King Size Mattress

1. Requires Significant Bedroom Space

While a king-size mattress is luxurious in size, it’s not suitable for every room. Placing a 150 x 200 cm mattress in a small or medium-sized bedroom can limit walking space, reduce furniture flexibility, and make the room feel cramped. Ideally, your bedroom should be at least 10 x 12 feet (approximately 3 x 3.6 metres) to comfortably fit a king-size mattress along with bedside tables and storage.

2. Higher Price Tag

With more surface area and premium materials, a king-size mattress usually comes with a higher upfront cost compared to smaller options like a double or queen. This cost reflects not only the size but the enhanced support features, premium foams, or hybrid coil systems that often come with king mattresses.
Example:

In the UK, a high-quality king-size mattress typically costs between £500 and £1,500, depending on the brand, construction, and materials.

• Budget models (open coil or basic memory foam) may start around £450–£600.
• Mid-range options (hybrid or zoned support) range between £700–£1,000.
• Premium models (orthopaedic, natural latex, luxury hybrids) can exceed £1,200–£1,800.

But it doesn’t stop there. King-size accessories such as:

• Fitted sheets (£25–£60 each),
• Duvets (£40–£120),
• Bed frames (£200–£800),are also more expensive than their double-size equivalents.

So while the comfort upgrade is significant, it’s important to factor in the total cost of ownership, not just the mattress itself.

3. Heavy and Difficult to Move

Due to its larger size and dense materials, a king-size mattress can be a logistical challenge to move. Whether you’re flipping it, rotating it for even wear, or relocating to a new home, this isn’t a task one person can typically handle. Most king-size mattresses require two or more people, or even professional movers, to carry and manoeuvre safely without bending or damaging the structure.

This becomes particularly inconvenient if you:

• Live in a flat with stairs or tight corridors
• Frequently move houses
• Like to rearrange your bedroom layout often

Average Weight by Mattress Type (King Size 150cm x 200cm):

Mattress Type	Average Weight
Memory Foam	30–40 kg
Pocket Spring	45–55 kg
Hybrid (Foam + Springs)	50–60 kg
Natural Latex	55–65 kg
Orthopaedic (Dense Foam)	50–70 kg

4. Limited Bedding Availability for Non-Standard Sizes

While standard king size bedding is increasingly accessible, variations like California King, Euro King, or Split King may require custom or imported bedding, especially in the UK. Even with standard sizes, high-quality or stylish bedding options may come at a premium or be limited in retail availability.

Tips for Choosing the Right King Size Mattress

Choosing the right king-size mattress goes beyond just size, it’s about aligning your personal comfort preferences, sleep habits, and lifestyle needs with the mattress’s core features. Here’s a comprehensive guide to help you make an informed decision:

1. Consider Your Sleeping Position

Your primary sleep position plays a crucial role in determining the ideal firmness and support you need:

1. Combination Sleepers Opt for a responsive medium-firm mattress that adapts to different sleep positions and provides a balanced level of support.
2. Side Sleepers A soft to medium mattress helps cushion pressure points around the shoulders and hips. Look for memory foam or hybrid options that contour your body gently.
3. Back Sleepers Medium-firm mattresses are typically best, offering the necessary lumbar support to maintain a neutral spine position.
4. Stomach Sleepers A firmer mattress prevents your hips from sinking too deep, which can misalign your spine and lead to back discomfort.

2. Choose the Right Firmness Level

Mattresses generally fall into three firmness categories, each catering to different body types and comfort preferences:

• Soft (1–3 out of 10) Ideal for lightweight sleepers or side sleepers who need extra cushioning. However, these may lack long-term support for heavier individuals.
• Medium-Firm (4–6 out of 10) A versatile choice that suits most sleepers, offering a balance of comfort and spinal support. It’s also ideal for couples with different firmness preferences.
• Firm (7–10 out of 10) Best for heavy sleepers or stomach sleepers, these provide strong support and help prevent excessive sinkage.

3. Evaluate the Material Type

Different materials offer different benefits in terms of comfort, durability, and support. Here’s what to consider:

• Innerspring Traditional and affordable. Offers bounce and good airflow but may lack motion isolation.
• Memory Foam Excellent for pressure relief and contouring. It’s especially effective for side sleepers and couples, but some models retain heat unless designed with cooling technology.
• Hybrid Combines coils and foam for a mix of bounce, contouring, and breathability. Ideal for all sleep types and couples.
• Latex (Natural or Synthetic) Durable, breathable, and hypoallergenic. Natural latex is especially popular among eco-conscious shoppers.

Tip: If you have allergies or sensitivities, opt for mattresses made with organic or OEKO-TEX certified materials.

4. Check for Temperature Regulation

Hot sleepers or those living in warmer climates should prioritize cooling features such as:

• Gel-infused memory foam that dissipates heat.
• Breathable covers made of bamboo, cotton, or Tencel.
• Latex, which naturally regulates temperature and doesn’t retain heat.

A cool sleep surface can significantly improve sleep quality, especially during warmer months or if you’re prone to night sweats.

5. Look for Motion Isolation and Edge Support

These are especially important if you share your bed with a partner:

Edge Support Reinforced edges prevent sagging and offer better support when sitting or sleeping near the mattress edges, great for couples and families.

Motion Isolation Memory foam and hybrid mattresses excel at absorbing movement, allowing one partner to turn or get out of bed without disturbing the other.

6. Trial Period and Warranty

Always check the return and warranty policy before making a purchase:

• Trial PeriodLook for brands that offer at least a 90–100 night trial. This gives you ample time to test the mattress in your own environment.
• WarrantyA minimum of 10 years is standard for quality mattresses. Ensure the policy covers sagging, workmanship defects, and material breakdown.

A long trial and robust warranty show that the manufacturer stands behind their product.

7. Set a Realistic Budget

King-size mattresses range in price depending on material, brand, and added features. While it may be tempting to cut costs, investing in a quality mattress pays off in terms of durability, comfort, and sleep quality.

• Budget-friendly options start around £400–£600 (basic memory foam or entry-level hybrids).
• Premium king mattresses with advanced cooling, support layers, and high-density materials range from £800 to £2000+.

If you’re shopping at Luxe Mattresses, watch for seasonal sales or bundle offers that add value to your investment.

Elevate Your Sleep with Best King-size Mattresses at Luxe Mattresses

With Luxe Mattresses’ premium selection for king-size mattresses designed for optimal comfort and support, you may experience next level sleep. Our collection ensures a sleep experience that properly suits your demands by fusing cutting-edge materials with expert design. Every mattress is designed to relieve pressure, enhance alignment and keep you cool throughout the night so you can wake up feeling rejuvenated.

1. Luxe Nova Hybrid Mattress – Balanced Comfort for All Sleep Styles

The Luxe Nova Hybrid Mattress combines Zero Gravity Foam™ with individually pocketed coils to offer medium-firm support. This hybrid structure adapts to various sleeping positions, making it ideal for couples or combination sleepers who value both cushioning and spinal alignment.

2. Luxe Velour Hybrid – Affordable Quality with Lasting Comfort

Looking for a high-quality king-size mattress that doesn’t break the bank? The Luxe Velour Hybrid delivers dependable comfort and pressure relief at an accessible price. Its layered foam and coil design helps minimise motion transfer and enhances breathability, perfect for hot sleepers and budget-conscious buyers alike.

3. Luxe Natural Pillow-Top Mattress – Organic, Sustainable, and Breathable

For eco-conscious sleepers, the Luxe Natural Pillow-Top Mattress is a top-tier choice. Crafted with organic cotton, natural latex, and locally sourced British wool, it offers plush pressure relief and temperature regulation, making it a luxury choice that’s as good for the planet as it is for your body.

4. Luxe Ergo 3400 Mattress – Firm Orthopaedic Support for Targeted Relief

The Luxe Ergo 3400 Mattress is built for sleepers who need enhanced support and firm comfort. Featuring a multi-zone FortiCoil™ 3400 spring system and cooling gel-infused foams, it’s the ideal mattress for those suffering from back pain or needing greater spinal alignment and durability.

Quick Guide to Choose Your Best Fit

• Want plush, organic comfort? → Try the Luxe Natural Pillow-Top Mattress
• Need balance and responsiveness? → Go for the Luxe Nova Hybrid Mattress
• Looking for orthopedic-grade firmness? → Choose the Luxe Ergo 3400 Mattress
• On a budget but want quality? → The Luxe Velour Hybrid is your best bet

Each of these Luxe king-size mattresses has been thoughtfully designed to meet a wide range of sleeping needs. Whether you’re after cloud-like softness, all-natural construction, or firm orthopaedic support, there’s a Luxe model that fits your lifestyle and your sleep.

Conclusion:

In conclusion, by reading this comprehensive guide, your search for the ideal king mattresses ends! Equipped with measurements and knowledge, you are prepared to turn your bedroom into a calm haven. Selecting the ideal mattress will help you wake up a happier, healthier version of yourself. Don’t accept anything less than royal treatment!