King vs Super King Bed: Which Size Is Right For You?

Choosing between a king size bed and a super king bed can make a noticeable difference to how comfortable and spacious your bedroom feels. Both are popular UK bed sizes, and both provide plenty of sleeping space for couples. However, the extra width of a super king can be important if you like more room to move, share the bed with children or pets, or simply prefer a generous sleeping area.

The right choice is not only about getting the biggest bed possible. Your bedroom dimensions, available floor space, sleeping habits and preferred bedroom layout all matter. Understanding the difference between a king vs super king bed can make it much easier to choose a size that suits your home.

What Is the Difference Between a King and Super King Bed?

The main difference between a king and super king bed is their width. In the UK, a standard king size mattress measures 150cm × 200cm, while a super king mattress measures 180cm × 200cm. Both have the same standard length, but a super king gives you an additional 30cm of width.

Bed Size	Width	Length
King Size	150cm (5ft)	200cm (6ft 6in)
Super King	180cm (6ft)	200cm (6ft 6in)

That extra 30cm may not sound substantial at first, but across the width of the mattress it can provide noticeably more personal space for two sleepers.

It is also worth remembering that these measurements refer to the mattress size, rather than necessarily the exact outside dimensions of the bed frame. Headboards, upholstery, storage mechanisms and other design features can make the overall frame larger.

King Size Bed: What Can You Expect?

A king size bed is 150cm wide and 200cm long, making it a spacious option for couples without taking up quite as much floor space as a super king. The 200cm length also provides more legroom than a standard double bed.

For many bedrooms, a king size bed offers a practical balance between sleeping space and room around the furniture. You can still have bedside tables, wardrobes and other bedroom furniture without the bed necessarily dominating the entire room.

A king size bed can be particularly suitable if:

• You share your bed with a partner.
• You want more space than a double bed provides.
• Your bedroom is a reasonable size but not particularly large.
• You want to retain comfortable walking space around the bed.
• You prefer a spacious bed without moving to the widest standard UK size.

Super King Bed: What Makes It Different?

A super king bed measures 180cm wide and 200cm long. It has the same length as a king but provides considerably more width, giving each sleeper additional room to spread out.

This extra width can be useful for couples who prefer not to sleep close together. It may also appeal to people who have children or pets occasionally joining them in bed.

However, the additional space comes with a practical consideration: a super king needs more floor area. The mattress itself is 30cm wider than a king, and the complete bed frame may occupy even more space depending on its design.

Before choosing one, think beyond whether the mattress will physically fit. You should also have enough room to walk around the bed, open wardrobes and drawers, and access other parts of the bedroom comfortably.

King vs Super King Bed: Which Gives You More Sleeping Space?

If your main priority is sleeping space, the super king provides more width.

A king mattress gives two people 150cm of width, while a super king gives them 180cm. This means the super king provides an additional 15cm of width per person if the space is shared evenly.

Both mattresses are 200cm long, so there is no difference in standard length between a UK king and super king. The extra space comes entirely from the width.

For taller sleepers, therefore, moving from king to super king will not provide additional legroom. If length is your main concern, check whether a specialist longer mattress or bed size would be more suitable.

Which Bed Size Is Better for Couples?

Both king and super king beds can work well for couples, but personal sleeping preferences can make one size more suitable than the other.

A king size bed may provide enough room if you and your partner are comfortable sharing the sleeping space and want to keep more usable floor area in the bedroom.

A super king can be useful if either person tends to move around during the night or prefers more personal space. The additional width creates a larger sleeping surface without making the mattress longer.

There is no universal answer because comfort is personal. Think about how much space you currently use on your bed and whether you regularly find yourself moving towards the edge or disturbing your partner during the night.

Will a Super King Fit Your Bedroom?

This is one of the most important questions to ask before buying a super king bed.

Do not measure only the empty area where the mattress will sit. Consider the entire bedroom layout, including:

• Bedside tables
• Wardrobes and cupboards
• Bedroom doors
• Windows
• Radiators
• Drawers and storage units
• Walking space around the bed

A useful approach is to mark the approximate footprint of the bed on your floor using removable tape. This can give you a much clearer idea of how much space the bed will occupy before you commit to it.

Also check the overall dimensions of the chosen bed frame, rather than relying only on the standard mattress measurements. A thick headboard or upholstered frame can add several centimetres to the footprint.

Think About Your Bedroom Layout

The size of the bed is only one part of the decision. How the bed fits into the room can affect how practical the space feels every day.

For example, a super king may technically fit into a bedroom but leave very little room to move around it. In that situation, a king size bed could create a more balanced layout.

On the other hand, if you have a large bedroom with plenty of unused floor space, the additional width of a super king may make better use of the available area.

The goal should be to create a bedroom where the bed feels comfortable without making the rest of the room difficult to use.

Don’t Forget the Mattress and Bedding

When changing from a king to a super king, remember that your existing mattress and bedding will not normally be interchangeable.

A king size mattress is designed for a 150cm × 200cm sleeping surface, while a super king mattress is designed for 180cm × 200cm.

The same applies to fitted sheets and mattress protectors. Check the measurements carefully before purchasing new bedding.

It is also worth checking the exact dimensions of your bed frame and mattress rather than relying solely on labels such as “king” or “super king”, particularly if you are replacing an existing bed.

King or Super King: What Should You Consider?

If you are still deciding between the two, consider these questions:

How much bedroom space do you have?

Measure the room before choosing. A larger bedroom gives you more flexibility, while a compact room may benefit from the smaller footprint of a king.

How much personal space do you prefer?

If you and your partner like having plenty of space between you, the extra width of a super king could make a noticeable difference.

Do you share the bed with children or pets?

Occasional visitors to the bed can make additional width useful. A super king provides more room without increasing the length.

Do you need space for other furniture?

Think about your complete bedroom rather than the bed alone. A slightly smaller bed may allow you to keep useful storage and comfortable walkways.

Are you replacing your existing bed?

If so, check the mattress, frame and bedding measurements before making a purchase. Standard sizes are useful guides, but individual frames can have different overall dimensions.

King vs Super King Bed: Making the Right Choice

The decision between a king size bed and super king bed ultimately comes down to how you use your bedroom and how much sleeping space you want.

A king size bed measures 150cm × 200cm and can provide a comfortable balance between generous sleeping space and practical floor usage. A super king measures 180cm × 200cm, giving couples an additional 30cm of width while keeping the same standard length.

If you have enough room and value maximum width, a super king may suit your sleeping habits. If you want plenty of space while keeping more room around the rest of your furniture, a king size bed may fit your layout more comfortably.

Before making your choice, measure your bedroom, check the complete bed-frame dimensions and consider how much space you and your partner actually need. The best bed size is the one that gives you comfortable sleep while still allowing your bedroom to function naturally.