King Bed Vs. Super King Bed Dimensions

Sep 17 2025

The choice between a king and super king mattress is ultimately one of space, comfort level, and lifestyle. Each one provides a great sleep surface for couples. However, if you are looking for extra space, knowing the differences in size and support is key. In this article, we provide a head-to-head comparison of these two premium mattress sizes, which can be easily found in most places across Australia.

An Overview of the King-Size Bed

The king-size mattress is one of the popular choices in Australian homes. The king-size bed is an ideal choice for the couples who want more sleeping space than a queen mattress without requiring an oversized bedroom

Best for: Couples, tall individuals, and people who prefer more width while sleeping.
Fit: Best for master bedrooms that are at least 3.6 m x 3.6 m.
King Bed Dimensions: 183 cm wide x 203 cm long

The size provides enough space for two adults and enough room to move around without disturbing your partner.

King Size Bed Dimensions

What are the dimensions of a king size mattress in mm’s?

King mattress dimensions in mm are 1,830 x 2,030 mm.

King size bed dimensions in mm may be different on the basis of the mattress brand.

What are the dimensions of a king size mattress in cm’s?

King mattress dimensions in cm are 183 cm x 203 cm.

*King size bed dimensions in cm may be different on the basis of the mattress brand.

What are the dimensions of a king size mattress in inches?

King mattress dimensions in inches are 72.0 in × 79.9 in.

*King size bed dimensions in inches may be different on the basis of the mattress brand.

The Pros and Cons of King-Size Beds

Pros:

Great choice for couples who need more space than a queen mattress provides
It is widely available in bed frames, accessories, and bedding.
It fits comfortably in most master bedrooms.
The king-size bed is easier to move than a super king bed.

Cons:

It may still feel a bit tight if co-sleeping with a child or pet.
It may require more space than a queen-size mattress and may not be suitable for small rooms.

The Super King: The Ultimate Luxury

The super king-size mattress is the widest standard-width mattress in Australia, so you’ve got extra room all around. Great for large bedrooms and the ultimate luxury sleeping experience, especially if you share your bed or are a light sleeper.

Best for: Couples who like their own space, families, or just anyone in the market for maximum comfort.
Fit: Best for rooms 4.2 m x 4.2 m or larger.
Super King Bed Dimensions: 203 cm wide x 203 cm long

A Super King offers more room between partners and the edges, since it’s 20 cm wider than a standard King-size bed.

Super King Size Bed Dimensions

What are the dimensions of a super king size mattress in mm’s?

Super king mattress dimensions in mm are 2,030mm x 2,030 mm.

*Super king size bed dimensions in mm may be different on the basis of the mattress brand

What are the dimensions of a super king bed in cm?

Super king mattress dimensions in cm are 203 cm x 203 cm.

*Super king size bed dimensions in cm may be different on the basis of the mattress brand.

What are the dimensions of a super king bed in inches?

Super king mattress dimensions in inches are 79.9 in × 79.9 in.

*Super king size bed dimensions in inches may be different on the basis of the mattress brand.

The Pros and Cons of Super King Beds

Pros:

Maximum personal space for undisturbed sleep
Perfect for families co-sleeping
Enhances luxury and aesthetics in large bedrooms
Reduces movement disturbance

Cons:

Requires a larger bedroom to fit properly
Higher cost for mattress, bed frames, and linen
Less variety in accessories and bed bases
Heavier and more difficult to move

King Bed vs. Super King Bed: Making the Right Choice

Feature	King Bed	Super King Bed
Dimensions (AU)	183 cm (W) × 203 cm (L)	203 cm (W) × 203 cm (L)
Ideal For	Couples, medium to large bedrooms	Couples, families, large bedrooms
Space per sleeper	Moderate space	Extra space for each person
Room size needed	Minimum ~3.6m × 3.6m	Minimum ~4.2m × 4.2m
Common in Australia?	Yes — widely available	Less common — limited availability
Bedding cost	More affordable and widely available	Higher cost, harder to find accessories
Comfort level	High comfort for most	Premium comfort and more personal space
Best for	Everyday comfort and affordability	Luxury feel, co-sleeping with child or pet
Ease of moving/installing	Easier due to smaller size and weight	Bulkier and more difficult to maneuver

Looking for a King or Super King Mattress? Shop at Bedworld

Shop our comprehensive collection of king and super king mattresses at BedWorld. We believe in quality and comfortable affordable bedding and furniture. Whether you’re looking to upgrade your sleep setup or furnish a new home, we’ve found the bed that’s right for you.

FAQ

1. What are the dimensions of a super king bed in Australia?

A super king bed dimension in Australia measures approximately 203 cm × 203 cm, which is equivalent to 80″ × 80″, offering maximum width and comfort.

2. How much bigger is a super king compared to a king bed?

A super king adds around 20 cm more width over a standard king bed. King is equivalent to 183 cm wide, and Super King is equivalent to 203 cm.

3. Will a super king bed fit in my bedroom?

Only if your bedroom is large enough, ideally 4.5 m × 4.5 m or more, to allow enough space around the bed. For smaller bedrooms, a king size often fits more comfortably.

4. Is king or super king better for couples?

If both individuals care about space and sleeping without being disturbed by movement, a super king offers better width. A king still provides generous space and may be sufficient in many typical bedrooms.

5. Does a super king cost much more than a king bed?

Yes, generally. Not only is the mattress larger, but frames, bases, bedding, and delivery might cost more. Super King options are also less common, which can increase the price.