Short answer: Australia has six standard mattress sizes — Single, King Single, Double, Queen, King and Super King. A Single (92 × 188 cm) suits young kids and small rooms; a King Single (107 × 203 cm) gives growing kids and taller teens extra width and length; a Queen (153 × 203 cm) is the most popular size for couples; and a King (183 × 203 cm) is best if you want maximum room to spread out. Pick your size by who's sleeping on it, how tall they are, and the space in the room — then match your bed base to the same size.
Below is the full breakdown, including the size question Australians ask most: Single vs King Single.
Australian mattress sizes and dimensions
These are the standard Australian mattress dimensions. Sizes can vary by a centimetre or two between brands, so always check the exact specs on the product page before you buy a base or bedding.
| Size | Dimensions (W × L) | Best for |
|---|---|---|
| Single | 92 × 188 cm | Toddlers and younger kids, bunk beds, compact rooms |
| King Single | 107 × 203 cm | Growing kids, taller teens, single adults, guest rooms |
| Double | 138 × 188 cm | Solo adults who want more width; smaller couples' rooms |
| Queen | 153 × 203 cm | Most couples — the best balance of space and room fit |
| King | 183 × 203 cm | Couples who want maximum space, or share the bed with kids or pets |
| Super King | 203 × 203 cm | The largest footprint, for big rooms and maximum spread |
A quick way to remember it: width is about how many people (and how much spread) you need; length is about height. Anyone around 180 cm or taller is more comfortable on a 203 cm-long mattress (King Single, Queen, King or Super King) than on a 188 cm one.
Single vs King Single: what's the difference?
This is the size question we get asked most, especially by parents.
- A Single is 92 × 188 cm.
- A King Single is 107 × 203 cm — about 15 cm wider and 15 cm longer than a Single.
That extra width and length makes a King Single the better long-term choice for a child who's still growing, a tall teenager, or a single adult who likes room to move. It fits the same style of room as a Single but buys you years before the bed feels small.
Choose a Single if: the sleeper is a younger child, you're fitting a bunk bed, or the room is tight and every centimetre counts.
Choose a King Single if: you're buying for a child you don't want to upgrade again in two years, a teenager who's shooting up, or a single adult who finds a Single too narrow. It's the "buy once" size for a growing bedroom — the Naptime 2.0 Dual Firmness comes in King Single.
Both sizes are easy to move and set up because Naptime mattresses arrive compressed in a box — you carry the box to the room, unroll it, and it expands. No wrestling an awkward mattress up the stairs.
How to choose the right mattress size
For kids and toddlers
Start with a Single for younger children — it fits compact rooms and bunk beds. If you'd rather not upgrade again as they grow, go straight to a King Single: it's the same room footprint with noticeably more length and width, so it carries a child comfortably into the teenage years.
For teenagers
A King Single is the sweet spot. Teens grow fast, and the 203 cm length means a tall teen isn't hanging off the end. If the room is large and they're close to adult height, a Double gives even more width.
For single adults
A King Single or Double both work. Pick the King Single for length (great if you're tall) or the Double for width (great if you like to sprawl).
For couples
A Queen is the most popular couples' size in Australia for good reason — it fits most main bedrooms while giving two people proper space. Step up to a King if you want maximum width, or if kids and pets regularly end up in the bed.
For guest rooms
A King Single or Queen suits most guest rooms. King Single keeps a smaller room flexible; Queen makes guests feel like they're staying somewhere proper.
Does mattress size change the firmness or feel?
No. Size is about the footprint of the bed, not how it feels to sleep on. Every Naptime mattress is built to the same specification across all its sizes, so a Single and a Queen of the same model feel the same — one is simply larger. Choose your size by the sleeper and the room, and choose your firmness separately based on how you like to sleep. If you're unsure on firmness, the Naptime Mattress Quiz walks you through it in a couple of minutes.
Will it fit your room and your bed base?
Two quick checks before you order:
- Leave walking room. As a rule of thumb, allow around 60 cm of clear floor on each side of the bed you plan to walk past, plus space for wardrobe and drawer doors to open. Measure the room and mark out the mattress footprint with tape if you're unsure.
- Match the base to the mattress size. A King Single mattress needs a King Single base. If you're buying both, get them in the same size at the same time — browse Naptime bed bases to pair them up.
Getting the size right, risk-free
- Not sure between two sizes? Tape out both footprints on your bedroom floor before you decide — it's the quickest way to see which one actually fits the room once you allow for walking space and door swing (see the room-fit check above). If you're weighing up models as well as sizes, the Naptime Mattress Quiz narrows it down in a couple of minutes.
- Shopping online? Every mattress ships compressed in a box, with free metro delivery on orders over $499* (metro QLD, NSW, VIC and SA) and same or next business-day dispatch on in-stock items.
- Want reassurance you've chosen well? Eligible mattress models come with our 100-Night Goodnight Guarantee** — sleep on it and make sure it's right for you.
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.
Frequently asked questions
What are the standard mattress sizes in Australia?
The six standard Australian mattress sizes are Single (92 × 188 cm), King Single (107 × 203 cm), Double (138 × 188 cm), Queen (153 × 203 cm), King (183 × 203 cm) and Super King (203 × 203 cm).
Is a King Single bigger than a Single?
Yes. A King Single (107 × 203 cm) is about 15 cm wider and 15 cm longer than a Single (92 × 188 cm), which makes it a better long-term choice for growing kids, taller teens and single adults.
What size mattress is best for a child?
A Single suits younger children and bunk beds. A King Single is the better "buy once" choice for a child you don't want to upgrade again soon, because the extra length and width carries them into their teens.
What is the most popular mattress size in Australia?
The Queen (153 × 203 cm) is the most popular size for couples, because it fits most main bedrooms while giving two people comfortable space.
What size mattress do I need if I'm tall?
If you're around 180 cm or taller, choose a size that's 203 cm long — King Single, Queen, King or Super King — so your feet aren't hanging over the end.
Do I need a bed base the same size as my mattress?
Yes. Always match the base size to the mattress size. If you're buying both, order them together in the same size.
* Free metro delivery on orders over $499 — metro QLD, NSW, VIC and SA.
** The 100-Night Goodnight Guarantee applies to eligible models only: Optimal Support, Naptime 2.0 Dual Firmness, Odyssey and Oasis Gel. A minimum of 30 nights must pass before a comfort claim can be made. Mattresses only — bed bases, headboards, manchester and toppers are not included. Original delivery and freight costs are non-refundable and a mattress protector is required. See the Goodnight Guarantee page for full terms.
