King Single Mattress Size in Australia & Who It’s For
Share
Choosing the right mattress size isn’t just about width — it’s about comfort longevity, room planning, and future-proofing your sleep setup.
If you’re considering a king single, you’re likely in one of these situations:
- A growing teenager needs more space
- A tall sleeper finds a standard single too short
- A guest room needs flexibility
- A compact bedroom can’t fit a double
This guide explains everything you need to know about the king single mattress size in Australia, including exact dimensions, room layout requirements, comparisons, and whether it’s the right investment.
If you’d like to compare all available sizes, you can refer to our complete 👉 Bed Mattress Size Guide Australia 👈 for a full breakdown.
What Is a King Single Mattress Size in Australia?
A standard king single mattress in Australia measures:
107 cm wide × 203 cm long
This makes it:
- 15 cm wider than a standard single (92 cm × 188 cm)
- The same length as a queen and king mattress (203 cm)
That added length is one of its biggest advantages.
Why Length Matters More Than You Think
Many people focus on width when choosing a bed, but length significantly affects comfort — especially for taller sleepers. If your mattress is too short:
- Your feet may hang off the edge
- You may unconsciously curl your legs
- Sleep posture may become compromised
At 203 cm long, a king single accommodates most adults up to around 190–195 cm comfortably.
How Big Is a King Single Compared to Other Australian Sizes?
Here’s how king single fits within the Australian sizing hierarchy:
| Mattress Size | Dimensions (cm) | Suitable For |
|---|---|---|
| Single | 92 × 188 | Children |
| King Single | 107 × 203 | Teens & tall singles |
| Double | 138 × 188 | Solo adults / compact couples |
| Queen | 153 × 203 | Couples |
| King | 183 × 203 | Couples wanting space |
You can see that king single is unique: it combines extra length with moderate width, positioning it between a single and a double.
Who Is a King Single Mattress Best For?
1. Growing Teenagers
Teenagers quickly outgrow standard single beds.
A king single offers:
- Adult-length support
- More shoulder and arm space
- Long-term usability into adulthood
It’s often considered a “transition mattress” between childhood and adult bed sizes.
2. Tall Single Adults
If you’re over 180 cm tall, a standard single (188 cm long) may feel restrictive.
A king single gives:
- Full leg extension
- Improved spinal alignment
- Better overall comfort
For tall sleepers who don’t share a bed, it’s one of the most practical options available.
3. Guest Bedrooms
Guest rooms often need to balance space efficiency and comfort.
A king single:
- Feels more premium than a single
- Fits smaller guest rooms better than a double
- Accommodates adult guests comfortably
For occasional use, it’s a smart compromise.
4. Studio Apartments & Compact Homes
In smaller urban homes where space is at a premium, a double may dominate the room.
A king single:
- Frees up floor area
- Allows room for desks or wardrobes
- Maintains adult-level comfort
It’s often ideal for solo sleepers in apartments.
Recommended Room Size for a King Single
Choosing the right mattress isn’t just about the bed — it’s about how it fits within the room.
Minimum Room Size
We recommend a room size of at least:
2.6 m × 3 m
This allows:
- Bed placement along one wall
- 60 cm clearance on at least one side
- Space for a small bedside table
Ideal Room Size
For optimal movement and furniture placement:
3 m × 3 m or larger
This allows:
- Bedside tables on both sides
- Comfortable walking space
- Additional storage or desk area
King Single vs Single: Is It Worth the Upgrade?
The width difference may seem minor (15 cm), but in practice, it’s noticeable.
Additional Width Benefits
That extra 15 cm provides:
- More shoulder movement
- Extra turning space
- Better comfort for side sleepers
Additional Length Benefits
The extra 15 cm in length makes a substantial difference for:
- Teenagers during growth spurts
- Adults with longer legs
- Anyone who dislikes feeling confined
If budget and space allow, king single is often considered the more future-proof option.
King Single vs Double: Which Should You Choose?
Some people debate between king single and double.
Double Mattress (138 × 188 cm)
Pros:
- Wider sleeping surface
- Can accommodate two people short-term
Cons:
- Shorter than king single
- Takes up more room width
King Single (107 × 203 cm)
Pros:
- Longer
- More space-efficient
- Ideal for tall solo sleepers
Cons:
- Not suitable for couples
If you sleep alone and value legroom, king single is often the smarter choice.
Mattress Height Considerations
Mattress thickness is another important factor.
Most king single mattresses range between:
- 20 cm (standard profile)
- 25–30+ cm (premium profile)
Thicker Mattresses Provide:
- Enhanced pressure relief
- Greater durability
- Improved edge support
However, ensure:
- Your bed frame supports the thickness
- Your fitted sheets accommodate deeper profiles
Bedding & Accessories Compatibility
When you're picking up a king single mattress, you’ll want to make sure your bedding actually fits the bill. To keep things comfy, grab yourself some:
- King single fitted sheets (don’t try to stretch a standard single over it!)
- King single mattress protector
- The right-sized doona
Using the wrong size sheets isn't just a hassle to put on—it’ll mess with your comfort and wear out your gear faster.
Can Two People Sleep on a King Single?
Short answer: no — not comfortably.
At 107 cm wide, it’s designed for one sleeper only. Two adults would find it restrictive for long-term use.
For couples, consider:
- Double (minimum)
- Queen (recommended standard)
Is a King Single a Good Long-Term Investment?
Yes — particularly for:
- Teenagers transitioning to adulthood
- Tall solo sleepers
- Homes where flexibility matters
It balances space efficiency and comfort longevity better than a standard single.
Common Mistakes When Choosing a King Single
- Not measuring the room properly
- Forgetting to account for bedside tables
- Buying incorrect sheet sizes
- Ignoring mattress height compatibility
- Assuming it can accommodate two people
Taking accurate measurements before purchasing prevents costly errors.
Explore Onebed King Single Mattress Options
If you’re ready to upgrade to a king single, it’s important to choose a mattress that offers the right balance of comfort, support, and durability.
At Onebed, our king single range is designed specifically for Australian sleepers, combining ergonomic support with premium materials and long-term value.
You can explore the full range here:
👉 King Single Mattress Collection 👈
Below is a quick overview of our three most popular king single models:
Onebed Essential – Reliable Everyday Comfort
The Onebed Essential is ideal for:
- Teenagers transitioning from a single
- Guest bedrooms
- Budget-conscious upgrades
It features multi-layer foam construction designed to deliver balanced medium support, making it a practical and affordable entry-level option without sacrificing comfort.
Onebed Original – Adaptive Hybrid Support
The Onebed Original is our best-selling hybrid mattress, combining:
- Pocket spring support
- Premium comfort foam layers
- Zoned ergonomic design
This model is especially suitable for:
- Tall single adults
- Growing teens
- Sleepers who want stronger spinal alignment
The hybrid construction provides improved airflow and edge support compared to all-foam designs.
Onebed Max – Premium Comfort & Enhanced Pressure Relief
The Onebed Max is our most advanced model, engineered for:
- Enhanced pressure distribution
- Greater motion isolation
- Higher-profile luxury comfort
It’s particularly well-suited to:
- Adult sleepers using a king single long-term
- Those wanting a more plush, hotel-style feel
- People seeking maximum durability
Frequently Asked Questions
Is king single the same length as queen?
Yes. Both are 203 cm long in Australia.
Is a king single big enough for adults?
Yes — for solo adult sleepers, especially tall individuals.
What age is a king single suitable for?
Typically from early teenage years onward, though adults frequently use them as well.
Does a king single fit standard bed frames?
It requires a king single–specific frame. A single frame will not fit.
Final Thoughts: Should You Choose a King Single?
A king single mattress offers a highly practical middle ground:
- Longer than a single
- More space-efficient than a double
- Ideal for teens and tall individuals
- Suitable for compact bedrooms
If you're sleeping alone and want adult-level comfort without committing to a larger footprint, it’s one of the smartest size choices available in Australia.
