Australia bed size dimensions are the first thing to pin down before you spend money on a mattress, because the size you choose shapes your sleep for years. Buy too small, and you’ll wake up cramped; too large, and it won’t fit your room. This guide covers every Australian bed and mattress size, from baby cots to super kings, with a dimensions chart, size comparisons and room size recommendations, so you can make a well-informed choice.
Note: All measurements below are for the Australian market. Bed sizes differ between countries, so always confirm dimensions when buying internationally. The naming is where people trip up most: a “king single” or a “double” can mean something quite different overseas, and a quick look at the Wikipedia overview of bed sizes shows how much the labels vary from one country to the next.
Australia bed size dimensions chart
Australian men average 175.6 cm tall and women 161.8 cm. Always allow at least 10–15 cm of extra length beyond your height when selecting a mattress. The chart below lists every size in metric and imperial, widest and longest first.
| Bed Size | Width (cm) | Length (cm) | Imperial |
|---|---|---|---|
| Super King | 203 | 203 | 6ft 8in × 6ft 8in |
| King | 183 | 203 | 6ft × 6ft 8in |
| Queen | 153 | 203 | 5ft × 6ft 8in |
| Double | 138 | 188 | 4ft 6in × 6ft 2in |
| King Single | 107 | 203 | 3ft 6in × 6ft 8in |
| Long Single | 92 | 203 | 3ft × 6ft 8in |
| Single | 92 | 188 | 3ft × 6ft 2in |
| Baby Cot | 69 | 130 | 2ft 3in × 4ft 3in |
How to read the chart and size up your own needs
Two numbers matter: width and length. Width decides how much room you have beside a partner, or how freely a single sleeper can roll over. Length decides whether your feet hang off the end. Most people focus on width and forget length, which is why the extra 10–15 cm allowance above is worth taking seriously. If you’re close to the top of the average range, or taller, a size that is 203 cm long is the safer pick.
Notice how many sizes share the same 203 cm length: super king, king, queen, king single and long single. Only the double and the standard single drop to 188 cm. That means choosing between a queen and a double is also a decision about legroom, not just width.
The imperial column is there because plenty of older furniture, rugs and bedroom plans are still described in feet and inches. If you’re measuring a room with an old tape, the conversions save a lot of arithmetic. Whichever units you use, measure the bed and the room in the same one.
Large beds for couples: super king, king and queen
Super King Bed: 203 cm × 203 cm
The super king is the largest mattress available in Australia, offering the most luxurious sleeping space. At 203 × 203 cm, it’s a perfect square, giving both sleepers maximum room to spread out. Ideal if you share with a restless partner, have children or pets who join you in the morning, or simply want the ultimate sleeping experience.
- Best for: 2 adults needing extra breathing space, plus pets or children
- Recommended room size: At least 4m × 4m (approx. 12ft × 12ft)
- Total mattress area: 4.12 m²
A bed this big takes over a room. Remember you still need space to walk around it, open wardrobe doors and get at bedside tables, and a super king can also be awkward to carry through narrow hallways and stairwells on delivery day.
King Bed: 183 cm × 203 cm
The king is the largest standard Australian mattress. While 20 cm narrower than a super king, it still offers generous space for two adults. A great choice if you want maximum comfort without needing an enormous room.
- Best for: 2 adults who need breathing space, or one active sleeper wanting extra room
- Recommended room size: At least 4m × 4m
- Total mattress area: 3.71 m²
King vs. Queen
A king is 30 cm wider and the same length as a queen. If you and your partner both need space to move during the night, a king is worth the investment. If you’re working with a smaller bedroom, a queen is still very comfortable for two adults.
Queen Bed: 153 cm × 203 cm
The queen is the most popular bed size in Australia, and for good reason. It’s the sweet spot between space and practicality for couples in average-sized bedrooms. A single sleeper has a luxurious 153 cm to themselves; two people get a comfortable 76.5 cm each.
- Best for: Couples needing some breathing space, or 1 active single sleeper
- Recommended room size: At least 3m × 3.5m (approx. 10ft × 12ft)
- Total mattress area: 3.10 m²
That 76.5 cm per person is a useful yardstick. It’s worth comparing it with a single mattress, since two adults on a queen each get a little less width than one person gets on a standard single. In my view the queen is the sensible default for most couples, and it’s only worth stepping up to a king if the room genuinely has the space to spare.
Mid-sized beds: double, king single, long single and single
Queen vs. Double
A queen is 15 cm wider and 15 cm longer than a double. If you need extra legroom or are taller than average, the queen is the better choice. Doubles are great for saving space in smaller rooms.
Double Bed: 138 cm × 188 cm
Also known as a full-size bed, the double is a versatile hybrid between a single and a queen. It comfortably fits one adult and can accommodate two adults with less personal space. At 46 cm wider than a single, it’s a popular upgrade for teenagers and young adults. Double mattresses are generally the most affordable of the larger sizes.
- Best for: One adult looking for comfort at a reasonable price; teenagers upgrading from a single
- Recommended room size: At least 3m × 3m
- Total mattress area: 2.59 m²
King Single Bed: 107 cm × 203 cm
The king single is wider and longer than a standard single, making it a great choice for taller individuals who want more sleeping room without the cost of a double. Two king singles pushed together create a super king, useful for couples with different firmness preferences. Always check that your bed frame is compatible, as standard single frames won’t work.
The split-bed idea is worth a closer look if you and your partner disagree on comfort. Each side can be a different feel, which is easier than finding one mattress that suits both. If you’re unsure how firmness differs, our guide to firm vs soft mattress choices explains the trade-offs.
- Best for: Taller individuals, active sleepers, teenagers
- Recommended room size: 2.7m × 3m
- Total mattress area: 2.17 m²
Long Single Bed: 92 cm × 203 cm
The long single has the same width as a standard single but is 15 cm longer, ideal for taller sleepers who don’t need extra width. A great option for guest rooms or single adults who are tall but prefer a narrower sleeping surface.
- Best for: Tall sleepers who don’t move much
- Recommended room size: 2.7m × 3m
- Total mattress area: 1.86 m²
Single (Twin) Bed: 92 cm × 188 cm
The single, also called a twin, is the smallest adult mattress in Australia. Perfect for children, teenagers, college dorm rooms, bunk beds, and small bedrooms. It’s the most budget-friendly option and works well for anyone with limited space.
- Best for: Older children, teens, and college students
- Recommended room size: 2.5m × 2.7m
- Total mattress area: 1.72 m²
Baby cot mattress size
Baby Cot: 69 cm × 130 cm
Baby cot mattresses are designed specifically for infants and toddlers aged 1–3 years. Standard cot dimensions are 69 × 130 cm. Many baby cots can be converted to toddler beds, saving money as your child grows. A cot mattress can fit into any size bedroom.
Cot mattresses are the one size where a precise fit matters more than comfort preferences. For safe sleep guidance for babies, Red Nose is the Australian organisation to consult, and your GP or child health nurse can answer questions specific to your child. Our cot mattress dimensions and size guide goes into more detail.
Questions to ask before buying a bed in Australia
- How many people will be sharing the bed? Do you have pets that sleep with you?
- What is the age and height of the primary sleeper(s)?
- Do you prefer extra width or extra length?
- What size is your existing bed frame? Will the new mattress fit?
- Do you prefer a firm or soft mattress feel?
- How large is your bedroom? Will the bed leave enough space to move around?
- What is your budget? (Larger beds cost more, both to buy and to buy linen for.)
Work through these in order and the answer usually narrows itself. The first two set the minimum width and length. The room question then caps how big you can go, and the budget decides whether you can afford to fill that space.
Frames, linen and the room around your bed
A mattress is only part of the purchase. The frame has to match the mattress size exactly, so check the dimensions of any frame you already own before ordering. If you’re shopping for a new one, our roundup of Australia’s best bed frames is a useful starting point, and what a platform bed is explains one popular style. Frame and mattress thickness together also decide how high the bed sits, which we cover in our piece on standard bed height.
Linen is the hidden cost. Sheets, quilts and covers are all sold by bed size, so a bigger bed means a bigger spend on everything that goes on it. Check our guides to bed sheet dimensions and sizes and the comforter sizes and dimensions chart before you commit, because sizing between the two does not always line up neatly.
Finally, think about the room as a whole. The recommended room sizes above are minimums, not targets. A bed that technically fits can still leave you squeezing past it to reach a window or a wardrobe, and that wears thin quickly. Measure the room, mark the bed’s footprint on the floor with masking tape, and walk around it. If you’re deciding whether to try a mattress first, our comparison of buying a mattress online vs in-store may help.
Matching size to your room, budget and habits
Understanding Australian bed size dimensions makes choosing the right mattress much simpler. Whether you’re upgrading from a single to a double, or investing in a super king for the ultimate sleep experience, matching your mattress size to your room, budget, and sleeping habits is the key to a great night’s rest.
If the numbers still feel abstract, the tape-on-the-floor trick is the quickest way to make them real before you buy.
Related articles
- Bed Sheet Dimensions and Sizes
- Comforter Sizes and Dimensions Chart
- Cot Mattress Dimensions & Size Guide Australia
For independent guidance on sleep and wellbeing, the Sleep Health Foundation is a good starting point.
