What’s the Biggest Bed Size? King vs Super King Explained
So, you know you want a big bed, but how big exactly? Choosing a new mattress is exciting — especially one that lets you spread out — but once you start comparing sizes, it can get confusing fast. If you’re wondering what the biggest bed size or largest mattress size available in Australia is, or debating king size vs super king, this guide has got you covered.
In Australia, the largest standard bed size available in most retailers is the super king mattress. But bigger isn’t always better. The right choice depends on your room size, sleeping habits and how much space you really need.
Key Takeaways
- The super king mattress is generally the biggest bed size commonly available in Australia.
- A king bed is slightly narrower but still offers generous sleeping space.
- The best size depends on your room footprint, sleepers, pets and lifestyle.
- Larger mattresses require larger bedding and accessories.
- Always consider room clearance and furniture placement before upgrading.
What does mattress size actually mean?
When we talk about mattress size, we’re referring to the mattress’s width and length in centimetres. In Australia, sizes follow standard naming conventions — single, double, queen, king and super king — each with set dimensions.
When comparing mattress sizes, even small differences in dimensions can significantly affect comfort, especially for couples. Just as the difference between queen and king beds can dramatically affect how you sleep at night, so too the jump in size between a king and a super king can dramatically affect:
- Personal sleeping space (likely your top concern!)
- Room layout
- Bed frame compatibility
- The size (and cost) of your bedding
Of course, the largest bed size sounds appealing, but it needs to suit your home — not just your wishlist. If you’re still comparing options, it’s worth browsing mattresses and checking our detailed Mattress Size Guide before deciding.
What are king bed dimensions?
A standard king bed size in Australia measures: 183 cm (W) × 203 cm (L)
That extra width compared to a queen makes a noticeable difference. Each person gets approximately the width of a single mattress to themselves, which is why king beds are so popular with couples.
Why choose a king bed?
- Plenty of space for two adults.
- Comfortable for occasional co-sleeping with kids.
- Easier to fit into most master bedrooms.
- More affordable bedding than a super king.
A king mattress still feels luxuriously spacious, but it’s more forgiving in smaller rooms. You’ll also find a wide range of compatible king-size bed frames, bedding and accessories to match.
What are super king mattress dimensions?
A standard super king mattress size in Australia measures: 203 cm (W) × 203 cm (L)
That’s 20 cm wider than a standard king — and those extra centimetres make a big difference in shared sleeping space.
Why choose a super king bed?
- Even more personal space for couples, especially hot sleepers or those who like to “spread eagle”.
- Ideal for families with young children who regularly climb in overnight.
- Comfortable for pet owners whose furry family members like to snuggle up.
- Popular choice for large master bedroom mattress setups where space isn’t limited.
If you’re searching for the biggest bed size available, this is usually it. Just remember: with more mattress comes a bigger bed base or frame and larger bedding.
King size vs super king — what’s the difference?
At first glance, king and super king look similar. But side-by-side, it’s easy to see the key difference is width. Both are the same length, but the super king gives you an extra 20 cm across.
| Feature | King | Super King |
|---|---|---|
| Width | 183 cm | 203 cm |
| Length | 203 cm | 203 cm |
| Best For | Couples | Couples + kids/pets |
| Room Size Needed | Large bedroom | Very large master bedroom |
How to choose between king & super king
1. Room size & clearance
Increasing the size of your bed might guarantee a better night’s sleep, but beware of sacrificing too much floor space in your bedroom as it could become squashy.
- King: around 3.5 m × 3.5 m
- Super king: around 3.8 m × 3.8 m
2. Who sleeps in the bed?
- Two adults only? King is likely more than enough.
- Kids regularly climbing in? Super king may be worth it.
- Pets? Extra width helps.
3. Budget considerations
Keep in mind bedding like quilts can be pricier in larger sizes.
4. Furniture layout
You’ll still need space for bedside tables, drawers and wardrobes.
Should you choose a king or a super king mattress?
Choose a king if you:
- Have a standard master bedroom.
- Prefer easier access around the bed.
Choose a super king if you:
- Have a large master suite.
- Share with kids or pets.
See our guide to choosing the right mattress for you.
What bedding do you need for super king & king beds?
Your quilt should match your mattress width.
You’ll also need sheets, quilt sets and layered pillows.
Find the best large bed for your home and lifestyle
If you’re searching for the largest bed size available, the super king is your go-to.
Explore our range of king and super king beds, mattresses and bedding in store now.
FAQs
What’s the biggest bed size commonly available?
In Australia, the biggest standard bed size is typically the super king mattress.
How big is a super king compared to a king?
A super king is about 20 cm wider than a king.
Can a super king fit in a standard bedroom?
It depends on the room size. Larger rooms work best.
What bedding sizes do I need for a super king bed?
You’ll need super king sheets, quilt and protectors.