King Mattress Size Guide Australia: How Much Space Do You Need?
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If you’ve ever woken up at the edge of the bed because your partner rolled over — or because your dog somehow ended up sleeping sideways — you’ve probably wondered whether it’s time for a bigger mattress.
For many Australian households, upgrading to a king mattress is the ultimate solution for better sleep space and comfort. But before you invest in one, it’s important to understand the king mattress size in Australia, how much bedroom space you’ll need, and whether it’s the right choice for your lifestyle.
The standard king mattress size in Australia is 183cm wide × 203cm long.
A king mattress is 30cm wider than a queen mattress, making it one of the best choices for Australian couples who want more sleeping space without moving to a super king.
In this guide, we’ll break down the exact king mattress dimensions in Australia, who it’s best suited for, and how to make sure your bedroom can comfortably accommodate it.
What Is the King Mattress Size in Australia?
The standard king mattress size in Australia is:
- 183 cm × 203 cm
- 72 inches × 80 inches
A king mattress is:
- 30 cm wider than a queen
- Ideal for couples needing extra sleeping space
- Best suited for bedrooms at least 3.6m × 3.6m
A king mattress provides a generous sleeping surface while still fitting many standard Australian master bedrooms.
Compared with other mattress sizes, the king bed provides significantly more sleeping space.
Here’s how it compares:
| Size | Width | Length | Best For |
|---|---|---|---|
| Single | 92cm | 188cm | One sleeper |
| King Single | 107cm | 203cm | Adults/small rooms |
| Double | 138cm | 188cm | Guest rooms |
| Queen | 153cm | 203cm | Most couples |
| King | 183cm | 203cm | Couples wanting space |
| Super King | 203cm | 203cm | Luxury bedrooms |
The biggest difference between queen and king mattress sizes is the extra 30 cm of width, which can make a noticeable difference if you share the bed.
That additional space allows each sleeper to move more freely during the night without disturbing the other.
How Much Bedroom Space Do You Need for a King Bed?
A king mattress may sound appealing, but it’s important to ensure your bedroom has enough space to accommodate it comfortably.
Interior designers typically recommend leaving at least 60–75 cm of walking space around the bed.
For a king mattress, the ideal bedroom size is:
3.6 m × 3.6 m or larger
This allows enough room for:
- Bedside tables
- Walking space
- Wardrobes or storage furniture
If your bedroom is smaller than this, a queen size mattress might be a more practical option.
However, if your room is spacious, a king bed can dramatically improve both comfort and visual balance in the room.
Can a King Mattress Fit Through Australian Doorways?
One of the practical questions many Australians ask before upgrading to a king mattress is whether it will actually fit through their home’s entry points.
A standard Australian king mattress measures 183 cm × 203 cm, so it is important to consider not only your bedroom size, but also the path the mattress needs to take to reach the room.
Before purchasing a king mattress, check:
- Front door and hallway width
- Staircases and tight corners
- Lift or apartment access
- Bedroom door clearance
- Bed frame assembly space
Traditional king mattresses can be difficult to move through narrow doorways because they are delivered at their full size. This can be especially challenging for apartments, older Australian homes, or bedrooms located upstairs.
A mattress-in-a-box design can make the process much easier. Onebed mattresses are compressed and rolled before delivery, allowing a king size mattress to be moved through tighter spaces more conveniently before expanding to its full size.
After delivery, always allow enough time for the mattress to fully expand and follow the manufacturer’s setup instructions to ensure the best comfort and performance.
Considering delivery access before buying helps ensure your new king mattress fits not only your bedroom, but your entire home.
Who Should Choose a King Mattress?
A king mattress is designed for sleepers who want more space without moving to a larger super king size. While it is often considered a luxury option, the extra width can provide practical benefits for many Australian households.
Couples Who Want More Personal Space
The most common reason couples choose a king mattress is the additional sleeping space.
A king mattress is 30 cm wider than a queen, giving both sleepers more room to move during the night. This can be especially helpful if you or your partner:
- Change sleeping positions frequently
- Prefer more personal space
- Are easily disturbed by movement during sleep
Families and Pet Owners
For households where children or pets occasionally join the bed, a king mattress provides extra room without making the sleeping area feel crowded.
The larger surface area allows couples to share the bed more comfortably while still maintaining enough personal space.
Overall, a king mattress is best suited for couples, families, and pet owners who have enough bedroom space and want a more spacious sleep environment.
⚡Who Should NOT Buy a King Mattress?
A king mattress may not be the best choice if:
- Your bedroom is smaller than 3.5m × 3.5m
- You live in a compact apartment
- You move homes frequently
- You want lower bedding and frame costs
- You sleep alone and don’t need extra width
In these situations, a queen mattress may offer a better balance between comfort and room functionality.
King Mattress vs Queen Mattress
For many Australian shoppers, the main decision comes down to choosing between a queen and king mattress.
Both sizes have the same length (203 cm), but a king mattress provides an additional 30 cm of width.
| Mattress Size | Width | Length | Best For |
|---|---|---|---|
| Queen | 153 cm | 203 cm | Most couples and standard bedrooms |
| King | 183 cm | 203 cm | Couples wanting more sleeping space |
The extra width of a king mattress can make a noticeable difference for couples who:
- Move around during sleep
- Prefer more personal space
- Share the bed with children or pets
However, a queen mattress may still be the better choice if your bedroom is smaller or you want more flexibility with furniture placement.
Choose a Queen Mattress If You:
- Have a smaller bedroom
- Prefer easier room layouts
- Want lower bedding and furniture costs
- Sleep alone or do not need extra width
Choose a King Mattress If You:
- Share your bed with a partner
- Want more space to move during sleep
- Have enough room for a larger bed
- Occasionally share the bed with children or pets
The right choice depends less on the mattress size itself and more on your bedroom space, sleeping habits, and lifestyle needs.
You can also compare all Australian mattress sizes in our complete guide:
👉 Bed Mattress Size Guide Australia
King Mattress vs Super King: What’s the Difference?
If you are considering a larger mattress size, you may also be comparing a king mattress with a super king.
The main difference is width. Both sizes have the same length, but a super king provides additional space for sleepers who want the largest standard mattress option available in Australia.
| Mattress Size | Dimensions (cm) | Best For |
|---|---|---|
| King | 183 × 203 | Couples wanting extra space |
| Super King | 203 × 203 | Large bedrooms and maximum sleeping room |
A super king mattress is 20 cm wider than a king, creating even more room to stretch out. However, the larger size also requires a bigger bedroom layout to ensure there is still enough walking space around the bed.
A super king is best suited for:
- Large master bedrooms
- Couples who want maximum sleeping space
- Homes with enough room for a larger bed frame and bedding
For many Australian households, a king mattress offers a better balance between comfort and practicality. It provides generous space for couples while still fitting comfortably in many standard bedrooms.
If you have a particularly large bedroom and want the biggest available mattress size, a super king may be worth considering.
Choosing a Mattress for Your King Size Bed
A larger mattress size also requires a mattress that provides consistent support across the sleeping surface.
For couples sharing a king bed, factors such as pressure relief, motion isolation and support become especially important.
Onebed offers king size mattresses designed for different comfort preferences.
You can view the full range of king size mattresses here:
👉 King Size Mattresses Collection
Final Thoughts
The king mattress size in Australia (183 × 203 cm) is the largest standard mattress available and offers generous sleeping space for couples, families, and even pets.
While it requires a larger bedroom, the additional width can significantly improve sleep quality by giving everyone more room to relax.
If your bedroom layout allows for it, upgrading to a king mattress can transform your sleep experience — especially if you share the bed with a partner, kids, or a four-legged companion.
