Quick answer: A “Super King” bed means different things by region. In the UK, it’s 180cm×200cm (71″×79″), 30cm wider than a UK King. In the US, “super king” isn’t a standard size—Americans should consider a Standard King (76″×80″), California King (72″×84″), or oversized options like Texas King (80″×98″) or Alaskan King (108″×108″). UK Super Kings need 14′×12′ rooms; US Kings need 13′×13′.
Key Takeaways
- Regional terminology: “Super King” is UK/European sizing (180cm×200cm); not a standard US term—US shoppers should look for California King, Standard King, or oversized options
- Size comparison: UK Super King is 30cm wider than UK King; US Standard King (76″×80″) is actually wider than UK Super King
- Room requirements: UK Super King needs 14′×12′ bedroom minimum; US King needs 13′×13′ for proper clearance and furniture
- Availability differences: UK Super Kings are standard and readily available; US shoppers need custom orders or should consider widely-available King/Cal King sizes
- Bedding compatibility: UK Super King bedding hard to find in US; King bedding readily available in US but won’t fit UK Super King
- Quick links: Compare King vs California King. See mattress sizes chart. Learn about oversized mattress options.
| Region | King Size | Super King Size | Size Relationship |
|---|---|---|---|
| UK | 150cm x 200cm (5'0" x 6'6") | 180cm x 200cm (6'0" x 6'6") | Super king is 30cm WIDER |
| US | 76" x 80" (193cm x 203cm) | Not a standard size | N/A - closest is California King |
| Australia | 183cm x 203cm | 203cm x 203cm | Super king is 20cm WIDER |
Regional Sizing Note: Bed size terminology varies significantly between countries. “Super king” is a standard UK and European size that is larger than a king bed in those markets.
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This size designation is not used in standard US mattress sizing. American readers seeking a bed larger than a standard king should explore California king, Texas king, or Alaskan king options. This article compares international sizing standards to help shoppers understand regional differences.
King beds are an excellent option if you’re looking for more sleeping space or a comfy mattress for two sleepers. A larger bed is especially appealing to co-sleeping parents or heavier couples for its extra space. And, if you’re rather tall, king beds offer height and room other mattresses simply can’t.
In our post, we lay out the details and differences of both super king and king beds as well as how you can choose between the two mattress sizes.
What Are Super King Bed Dimensions by Region?
A super king size bed is a larger mattress size that varies by region:
UK/European Super King: 180cm x 200cm (approximately 71″ x 79″), which is 30cm (12 inches) wider than a UK king bed
US Market: The term ‘super king’ is not a standard industry size in the United States. American retailers do not typically use this terminology. The largest standard US sizes are:
- Standard King: 76″ x 80″
- California King: 72″ x 84″
- Oversized mattresses like Texas King (80″ x 98″) or Alaskan King (108″ x 108″)
We will focus on how UK/European super king beds compare to US standard king beds for international shoppers or those importing mattresses.
For UK Super King (180cm x 200cm): You’ll need a bedroom at least 14′ x 12′ (approximately 4.3m x 3.7m) to allow for walkway space and bedroom furniture.
For US Standard King (76″ x 80″): You’ll need a bedroom at least 13′ x 13′ to comfortably accommodate the bed, other furniture and space to walk around. UK super king mattresses are not commonly stocked by American retailers.
Super king beds are readily available from most major UK retailers and are a standard mattress size. US shoppers wanting this size would need to:
- Import from UK manufacturers
- Use specialty/custom mattress companies
- Consider the similar California King (72″ x 84″) which is widely available in the US
Bedding for UK super king beds can be difficult to find in US stores but is standard in UK retail.
Also, due to their rarity, there are some minor size variations depending on the manufacturer, so be sure to double-check the dimensions of the mattress before buying any accessories to go along with it.
Not all bedding companies make bed sheets for a super king, so it can be difficult to find bed sheets. Again, those usually have to be specially made. And when it comes to mattress supports, you will have to get a bed set or foundation sized for your mattress.
Even headboard size can be tricky if you want an oversized bed with a classic look. It may be easiest to look for a wall-mounted standard king size headboard, which won’t need to be attached to a smaller bed frame.
Which Sleepers Should Choose a Super King Bed?
For UK/European Shoppers:
- Couples who want significantly more width than a king bed
- Families who co-sleep with children or pets
- Active sleepers who need space to move without disturbing partners
- Those with bedrooms 14′ x 12′ or larger
But for US shoppers, since UK super king is not a US standard size, consider instead:
- California King (72″ x 84″): Best for taller individuals, similar width to UK super king
- Standard King (76″ x 80″): Wider than UK super king, widely available
- Split King: Two Twin XL mattresses for customized comfort”
What Are Standard King Bed Dimensions and Features?
The king size bed, also known as the Eastern king, is the most widely available and largest standard mattress size. It measures at 76 by 80 inches, or 193 by 203 centimeters, and is rectangular. When compared to a super king’s dimensions, it is a bit taller and wider.
A king size mattress will fit best in a large bedroom no smaller than 13 by 13 feet.
King beds are readily available because they are a standard size. Nearly all mattress companies offer king mattresses and accessories, so you won’t need to do too much research when looking for your mattress. In addition, you could save some money because you won’t need any custom-made accessories or bedding.
Who Is a King Size Bed Best For?
Like super kings, couples are particularly drawn to king beds since they offer ample room for each sleeper. And, if you and your partner have different firmness preferences, you can use two twin XL mattresses together since they equal the same dimensions of a king. (We call these split kings.)
With a split king mattress, sleepers with different preferences can choose their preferred mattress model for their side of the bed. Read more about king vs split king mattresses.
When sharing a large bed, couples can sleep in their optimal sleeping position without disturbing their partner.
Best Amerisleep King Size Mattresses
Quick Guide: A 30-Second Summary
| Best King Mattress Overall | Amerisleep AS3 |
-
Price Range
$1149 to $2398
-
Mattress Type
Memory Foam
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Firmness
5 to 6 out of 10 (Medium)
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Availability
All sizes
-
Warranty
20 Years
-
Thickness
12 Inches
The AS3’s balanced medium feel makes it the perfect choice for couples who are seeking a king size mattress to share. The versatile surface provides comfort and support to most sleeping positions, and even partners who disagree on how a mattress should feel often find the AS3 feels just right to each of them.
- Sensitive areas of the body cradled by Bio-Pur®
- Five zones of support established through cutouts
- Sturdy base foam minimizes chances of soft spots
- Side, back, and combination sleepers
- Couples with conflicting sleep styles
- Hot sleepers
Many partners have different sleeping styles, making it a challenge to find a bed that’s compatible with both preferences. One partner may dismiss a bed as too soft for sleep, while the other may find another mattress too firm to enjoy. The AS3 is excellent for couples who want to share a king size mattress without any discomfort.
The AS3 is our most popular model and can significantly upgrade a person’s sleep experience. The memory foam model relies on three foam layers to establish a versatile medium feel that suits most sleep styles.
The first layer is Bio-Pur® foam, a material exclusive to our memory foam mattresses. Unlike traditional memory foam, we make Bio-Pur® foam by substituting certain ingredients with plant-derived oils. This foam is more sustainable, breathable, and responsive than traditional memory foam.
The next layer is Affinity foam with HIVE® technology. Hundreds of hexagonal cutouts comprise HIVE® technology, with the cutouts arranged to create variable support. The shoulders and hips feel softer through greater flexibility, providing an extra boost of pressure relief. Meanwhile the head, back, and feet areas focus more on spine support.
The final layer is Bio-Core® foam, a durable base structured for lasting support. All of these foam layers are certified safe by CertiPUR-US®, meaning they are free of potentially harmful materials.
We also offer the AS3 Hybrid, perfect for shoppers who want a king size mattress with springy support.
Every AS3 mattress includes a 100-night sleep trial and a 20-year warranty. The sleep trial starts when the mattress arrives at a customer’s front door, giving them months to try out the mattress and make sure it’s the right one.
Pricing of Amerisleep King Mattresses
| Mattress | Price |
|---|---|
| AS1 | $1199 |
| AS2 | $1399 |
| AS3 | $1599 |
| AS3 Hybrid | $1699 |
| AS4 | $1599 |
| AS5 | $2199 |
| AS5 Hybrid | $2399 |
| Amerisleep Organica | $1599 |
Where Can You Buy Super King and Oversized Mattresses?
Most companies do not sell oversized mattresses. Instead, oversized mattresses and other specialty beds are rare to come by, so you’ll need specialized boutiques or companies to produce them. However, when custom-ordering, you can customize specific details such as the mattress filling, mattress thickness, and firmness.
What About the California King?
The California king mattress, known for its dimensions of 84 inches in length and 72 inches in width, is a popular choice that strikes a balance between space and room size. It offers an extra 4 inches in length compared to a standard king, making it ideal for taller individuals.
The Cal king is a king size variation that is not considered an oversized mattress but is instead part of the standard-size run. Sometimes, it’s called the Western king as the counterpart to the traditional Eastern king bed.
While more accessible and affordable than larger options like the Alaskan king or super king, the California king provides ample sleeping space for couples, especially those with varying sleeping habits. When comparing mattress sizes, the California king stands out for its versatility and suitability for various bedroom sizes.
How Do You Choose Between King and Super King Sizes?
When looking to upgrade your mattress, there are certain details to consider when deciding between a king or super king sized bed.
Bedroom Space
Before choosing a mattress size, double-check if it fits in your bedroom by marking the dimensions of the mattress on the floor with measuring tape. You should have at least 30 inches of space between the bed and the perimeter of the room to avoid overcrowding.
Bedrooms typically have other furniture, such as end tables, a dresser, or additional seating. They can get cramped and uncomfortable if you purchase too large of a mattress for the size of your room.
If you want room for extra furniture, choose a smaller mattress; but if you value sleeping space more, go for the larger mattress size.
Bedroom Location
Mattresses, particularly oversized mattresses, are heavy, and it can be cumbersome taking a bed from point A to point B, especially if your bedroom is on the second or third floor of your home. However, companies who offer White Glove Delivery can carry the mattress up the stairs for you, taking this burden off your shoulders.
A large mattress may potentially not fit through your stairwell and bedroom door, though nowadays, most beds are available in bed in a box mattress sets, making them compact and easily transportable.
Number of Sleepers
If you share your bed with a partner, child, or sibling, a king or super king bed frame can comfortably sleep multiple individuals of varying heights and sizes. The sturdy construction of the bed frame ensures stability and support, allowing everyone to spread out comfortably and without bothering each other. So, families and couples can enjoy each other’s company while still having their own space.
On the other hand, if you’re just a single person, a king may be unnecessarily large and not worth the price. A super king size bed may be useful if you’re wanting a large sleeping space or are tall, though a single person rarely needs anything larger than a queen size mattress.
Budget
Before choosing a mattress, take into account the total cost of everything, including your mattress and its foundation, bed frame, and bedding, to check if it fits your budget. Super kings, due to their lack of availability, are usually more expensive than standard kings. King beds and their accessories are more readily available and easy to find at an affordable price.
Naturally, materials and other features affect price. Mattress thickness does as well, with taller beds costing more.
Practical Considerations for International Shoppers
Importing Considerations
- Shipping costs for international mattresses can be substantial
- Customs duties may apply for cross-border mattress purchases
- Warranty coverage often doesn’t extend internationally
- Return policies become complicated across borders
Bedding Solution Options
- US shoppers wanting UK Super King: Consider custom bedding makers or UK import shops
- UK shoppers in US: Standard King or California King bedding widely available
- Check thread count and material compatibility when ordering custom sizes
Moving Between Countries
- If relocating from UK to US (or vice versa), your bed frame and mattress may not fit standard sizing in new country
- Plan for replacement costs when moving internationally with oversized beds
- Consider selling existing bed and purchasing regionally when relocating
FAQs
Is a super king the same as a California king?
No. A California King is a US size (72″×84″) that’s longer but narrower than a US Standard King. “Super King” is a UK term (180cm×200cm) not used in standard US sizing—they’re completely different regional standards.
What’s bigger than a King bed in the US?
California King (72″×84″) is longer. Oversized options include Texas King (80″×98″), Wyoming King (84″×84″), and Alaskan King (108″×108″). These require custom ordering and special bedding.
Do US King sheets fit a UK Super King bed?
No. US King sheets (76″×80″) won’t properly fit UK Super King beds (71″×79″). UK Super King bedding is difficult to find in US stores but standard in UK retailers.
Can you buy a Super King mattress in the US?
UK Super King sizes aren’t standard in the US. You’d need to custom-order or import from UK manufacturers. Consider readily-available US Standard King or California King instead.
What room size do you need for a Super King bed?
UK Super King needs a bedroom at least 14′×12′ (4.3m×3.7m). US Standard King needs at least 13′×13′. This allows 30 inches clearance on each side for walking and furniture.
Do mattress dimensions vary by country?
Yes, significantly. UK King (150cm×200cm) differs from US King (76″×80″) and Australian King (183cm×203cm). Always verify your region’s sizing standards before purchasing bedding or mattresses internationally.
Can two adults sleep comfortably on a Full bed?
A Full (54″×75″) gives each person only 27″ width—quite cramped. Couples should choose at least Queen size (60″×80″), or King/Super King for optimal comfort and personal space.
Are Super King mattresses more expensive than King mattresses?
In the UK where Super King is standard, prices are comparable to King beds. In the US, custom Super King orders cost significantly more due to specialty manufacturing and limited availability.
Conclusion
When choosing between King and Super King beds, your location matters more than you might think. For UK and European shoppers, a Super King (180cm×200cm) offers 30cm more width than a standard King—perfect for couples who want maximum space.
For US shoppers, “super king” isn’t a standard size; instead, choose a Standard King (76″×80″) for width, a California King (72″×84″) for length, or explore oversized custom options like Texas or Alaskan King for truly expansive sleep space.
Before purchasing, always verify:
- Your bedroom can accommodate the mattress with 30″ clearance on all sides
- Bedding and accessories are available in your region for that size
- The mattress fits through doorways and stairwells
- Your budget covers not just the mattress but frame, foundation, and bedding
Ready to find your perfect King-size mattress? Browse our complete King mattress collection to compare models, or see our mattress size guide to explore all available dimensions.
Found this comparison helpful? Share your experience with King or Super King beds in the comments below, or share this guide to help others navigate international mattress sizing confusion.
About the author
April Mayer is a sleep expert and writer with a degree in exercise physiology. She has dedicated her career to exploring the relationship between sleep and productivity. Her insightful articles, such as "The Surprising Way Your Mood Might Be Messing With Your Productivity" and "Wake Up to More Productive Mornings," have been featured in reputable publications like Forbes, Greatist, Real Homes, Thrillist, Tom's Guide, and Eat This, Not That. With a passion for helping others lead more productive lives through restful sleep, April offers valuable expertise on foods and vitamins for better sleep. As a trusted member of the Early Bird team since March 2020, she continues to provide informative and well-researched content.
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