King Single Bed Size Australia: Dimensions and Who It Suits (2026)

A King Single mattress is 107 × 203 cm in Australia — about 15 cm wider and 15 cm longer than a Single. It suits growing kids, tall teenagers, single adults and guest rooms, and it fits the same style of room as a Single while buying you years before the bed feels small.

Below: the exact dimensions, how a King Single compares to a Single and a Double, whether it will fit your room, and what to check before you buy bedding for one.

King Single bed dimensions

A King Single is 107 cm wide and 203 cm long. That is the standard Australian King Single size.

Here is where it sits against the other Australian sizes:

Sizes can vary by a centimetre or two between brands, so check the exact specification on the product page before you order a base or bedding.

King Single vs Single: what's the difference?

A King Single is 15 cm wider and 15 cm longer than a Single. It is the same idea of bed — one sleeper — with more room in both directions.

The length is the part people underestimate. At 188 cm, a Single starts to feel short for anyone around 175 cm or taller, because you want some clearance at the feet rather than exactly your own height. A King Single's 203 cm removes that problem for almost everyone.

Choose a Single if the sleeper is a younger child, you are fitting a bunk bed, or the room is tight enough that 15 cm matters.

Choose a King Single if you are buying for a child you would rather not upgrade again in a few years, a teenager who is still growing, or a single adult who finds a Single narrow.

King Single vs Double: which is bigger?

This one catches people out, because neither is straightforwardly bigger.

A Double is wider but shorter. So if the sleeper is tall, a King Single is the more comfortable bed despite being narrower. If the sleeper is short and likes to sprawl, a Double gives more room to move.

Who is a King Single best for?

• Growing kids. It is the "buy once" size. A child who moves into a King Single at seven or eight is unlikely to outgrow it before they leave home.
• Teenagers. The 203 cm length is the reason. Teens grow fast, and a Single runs out of length well before they stop growing.
• Single adults. Particularly in a smaller bedroom, where a Double would eat the floor space but a Single feels mean.
• Guest rooms. Two King Singles side by side can be made up as separate beds for two guests, which a Double cannot.
• Studios and small apartments. Full adult length without the width of a Double.

Will a King Single fit your room?

The mattress footprint is 107 × 203 cm, but the bed will be slightly larger once it is on a base, and larger again with a headboard.

Two checks before you order:

• Allow walking room. As a rule of thumb, leave around 60 cm of clear floor on any side you need to walk past, plus room for wardrobe and drawer doors to open fully.
• Mark it out. Put masking tape on the floor at 107 × 203 cm and live with it for a day. It is the quickest way to know, and it costs nothing.

The length is usually the constraint rather than the width. A King Single is 15 cm longer than a Single, so a bed that fitted neatly between a wall and a doorway may no longer clear it.

King Single bedding and bases

King Single bedding is its own size. Single sheets will not fit, and Double sheets will be loose. Buy fitted sheets labelled King Single, and check the pocket depth is enough for your mattress plus any topper.

Quilts and doonas are more forgiving. Many people use a Double quilt on a King Single so there is enough overhang on both sides.

Your base must also be King Single. A King Single mattress on a Single base will overhang at the sides and the foot, which is uncomfortable and puts the mattress edges under strain. If you are buying both, order them together in the same size.

Naptime King Single mattresses

Not every model in our range comes in King Single, and stock moves, so check the product page for current availability before you plan around a particular model.

The Naptime 2.0 Dual Firmness is our King Single that is in stock at the time of writing. It is a pocket spring mattress with a different firmness on each side, so you flip it to change the feel rather than replacing it — useful for a child's bed, where what suits a seven-year-old is not what suits a fifteen-year-old.

You can see everything currently available in the size on our mattresses page.

Frequently asked questions

What size is a King Single bed in Australia?

A King Single mattress is 107 cm wide and 203 cm long.

Is a King Single bigger than a Single?

Yes. A King Single is 15 cm wider and 15 cm longer than a Single, which is 92 × 188 cm.

Is a King Single bigger than a Double?

Not straightforwardly. A King Single is 15 cm longer than a Double but 31 cm narrower. A Double is the wider bed; a King Single is the longer one.

Can two people sleep in a King Single?

It is a single bed, so it is built for one sleeper. At 107 cm wide it is narrower than a Double, which is already tight for two adults.

How long is a King Single bed?

203 cm, the same length as a Queen or a King. That is what makes it suitable for tall sleepers.

Does a King Single fit a bunk bed?

Usually not. Most bunk frames are built for a Single. Check the frame's stated mattress size before buying.

Do King Single sheets fit a Single bed?

No. King Single fitted sheets are cut for a 107 × 203 cm mattress and will be loose on a Single. Buy the size that matches your mattress.

Is a King Single good for an adult?

Yes, for one adult. It is full length at 203 cm, so it suits tall single adults, and it takes less floor space than a Double.

Browse all mattresses · See every Australian mattress size · How to choose firmness

Naptime is an Australian-owned family business based in Capalaba, QLD (est. 2012), selling factory-direct so you get the mattress without the retail mark-up. Trusted by 100,000+ Australian customers, and rated 4.8 stars on Okendo. We take care of the rest.