The king single is one of those Australian mattress sizes that sounds bigger than it is. It is not a king at all, but a roomier single, and it fills a genuinely useful gap between a standard single and a double.
This guide explains the king single's dimensions, how it compares to other sizes, and exactly who tends to benefit from it.
King Single Dimensions and Where the Name Comes From
In Australia, a king single mattress is approximately 107 cm wide by 203 cm long. The "king" refers to the extra width and length over a standard single, not to a king-bed footprint.
That makes it noticeably wider and longer than a single, while still being a one-person bed. Always confirm the exact dimensions against the specific mattress, as sizes can vary slightly between brands. Our Australian bed size guide lists all the standard sizes.
King Single vs Single vs Long Single
Here is how the single-bed family compares in Australia.
| Size | Approx. dimensions | Best for |
|---|---|---|
| Single | 92 x 188 cm | Young children, very compact rooms |
| Long Single | 92 x 203 cm | Tall sleepers who need length, not width |
| King Single | 107 x 203 cm | Extra width and length for one person |
The key difference: a king single gives both more width and more length than a standard single, while a long single adds only length.
Who a King Single Suits
The king single earns its keep in several situations.
- Children and teens, who appreciate the extra room as they grow, making it a long-lasting choice for a kid's room. See choosing a mattress for children.
- Tall single sleepers, thanks to the 203 cm length.
- Solo adults in smaller bedrooms, who want more space than a single without the footprint of a double.
- Bunk beds and trundles, where king single is a popular upgrade size.
- Guest rooms, where it comfortably sleeps one and suits flexible spaces.
Room Size and Bedding Fit
A king single needs a bit more floor space than a single, so check it fits with room to walk around and open drawers. Because it is a specific size, make sure your bed base, fitted sheets and protector are king single rather than standard single, as single bedding will be too small.
When to Size Up to a Double or Queen Instead
If the bed is for two people, even occasionally, a king single will be too narrow, and a double or queen is the better choice. A king single is firmly a one-person bed; it simply gives that one person more room. For couples, see our best mattress for couples guide.
DuuDuu's King Single Option
If a king single suits your space and sleeper, a quality hybrid in this size gives a child, teen or solo adult proper support and pressure relief, with the convenience of mattress-in-a-box delivery. Confirm the king single dimensions and specifications against the product details before ordering.
Frequently Asked Questions
What are the dimensions of a king single?
In Australia a king single is approximately 107 cm wide by 203 cm long, wider and longer than a standard single but still a one-person bed. Confirm the exact size against the specific mattress, as it can vary slightly by brand.
Is a king single bigger than a single?
Yes. A king single is both wider and longer than a standard single, giving one person noticeably more room. A standard single is about 92 by 188 cm, while a king single is about 107 by 203 cm.
Is a king single good for adults?
For a solo adult, yes, especially in a smaller bedroom or for a tall person who needs the 203 cm length. It is roomier than a single while taking less space than a double. It is not suitable for two people, though.
What's the difference between a king single and a long single?
A long single adds length only, staying narrow at about 92 cm but extending to around 203 cm. A king single adds both width and length, at about 107 by 203 cm. Choose a long single if you only need extra length, and a king single if you want more room overall.
