King Single Mattress Size in Australia & Who It’s For
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Choosing the right mattress size is about balancing comfort, available space, and how your sleeping needs may change over time.
A standard king single mattress in Australia measures 107 cm × 203 cm, making it one of the best choices for taller solo sleepers who need extra length without taking up as much space as a double mattress.
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 mattress shoppers focus on width, but mattress length can have a major impact on comfort.
A standard single mattress measures 188 cm long, which may feel restrictive for taller sleepers.
At 203 cm long, a king single provides:
- More legroom
- A more comfortable sleeping position
- Extra space for growing teenagers
For solo sleepers who need additional length without moving to a larger mattress, this is one of the biggest advantages of a king single.
How Big Is a King Single Compared to Other 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 wanting more width |
| Queen | 153 × 203 | Couples |
You can see that king single is unique: it combines extra length with moderate width, positioning it between a single and a double.
Who Should Choose a King Single Mattress?
A king single mattress is designed for sleepers who need more space than a standard single but don't have room for a double. It offers a practical balance between comfort and space efficiency, making it one of the most versatile mattress sizes in Australia.
Growing Teenagers
As children grow into their teenage years, a standard single mattress can start to feel restrictive. A king single provides the extra length needed through growth spurts while still fitting comfortably in most bedrooms.
It's a practical long-term upgrade that can continue to suit many sleepers into adulthood.
Tall Solo Sleepers
For taller adults, mattress length is often more important than width. At 203 cm long, a king single offers the same length as a queen or king mattress while taking up far less floor space.
If you sleep alone and want extra legroom without moving to a larger bed, a king single is one of the best options available.
Guest Rooms and Compact Homes
A king single is also a smart choice for guest bedrooms, studio apartments, and smaller homes where every square metre matters.
Compared with a double mattress, it occupies less floor space while still providing comfortable sleeping dimensions for most adult guests. It also leaves more room for wardrobes, desks, or other furniture, making it easier to maintain a practical room layout.
What Room Size Do You Need for a King Single?
A king single mattress requires more space than a standard single, but it can still fit comfortably in many Australian bedrooms.
A room around 3 m × 3 m provides enough space for:
- Walking clearance
- A bedside table
- Storage furniture or a desk
For smaller rooms, always consider the placement of wardrobes, doors, and other furniture before purchasing.
Because a king single has a narrower footprint than a double, it leaves more usable floor space for wardrobes, desks, or other furniture, making it a practical choice for compact bedrooms.
King Single vs Single: Is It Worth the Upgrade?
| Single | King Single | |
|---|---|---|
| Width | 92cm | 107cm |
| Length | 188cm | 203cm |
| Best For | Children, small rooms | Teenagers, taller sleepers |
The key difference:
Single saves space. King single adds comfort.
Choose a single if:
- Bedroom space is limited
- The sleeper is younger
- Maximising floor space is important
Choose a king single if:
- The sleeper is growing
- Extra legroom is needed
- You want a longer-term option
For many Australian households, a king single is often seen as a long-term upgrade because it provides extra space without requiring a much larger bedroom.
King Single vs Double: Which Should You Choose?
| Mattress Size | Dimensions | Best For |
|---|---|---|
| King Single | 107 × 203 cm | Tall solo sleepers, teenagers |
| Double | 138 × 188 cm | Adults wanting more sleeping width |
The biggest difference is simple:
- A king single is longer but narrower.
- A double is wider but shorter.
Choose a king single if you:
- Need extra legroom
- Sleep alone
- Have a compact bedroom
Choose a double if you:
- Want more room to move during sleep
- Occasionally share the bed
- Have enough bedroom space
For solo sleepers, the choice usually comes down to whether extra length or extra width matters more.
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)
Choosing a King Single Mattress from Onebed
Onebed offers several king single mattress options designed for different sleepers:
Onebed Essential
A practical option for teenagers, guest rooms, and everyday comfort.
Onebed Original
A versatile hybrid mattress with balanced support, suitable for growing teenagers and adult solo sleepers.
Onebed Max
A premium option for sleepers wanting enhanced comfort, support, and durability.
All models are available in Australian king single size (107 × 203 cm).
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.
