Buying a new mattress is one of the most important decisions you can make for your sleep — and yet, many Australians overlook the most fundamental question: will it actually fit? Getting the size wrong means either cramped nights for the people sharing the bed, or a mattress that leaves a gap between itself and the bed frame. Neither is ideal.
Australian mattress sizing follows its own standard, which is slightly different from the US and UK. So if you've been Googling general sizing charts, you might end up with a mattress that doesn't quite line up with your bed frame or your bedroom floor plan. This guide breaks down every standard size — what the measurements mean, who each size suits, and how to choose the right one for your needs.
It's easy to assume that "a double is a double" anywhere in the world. But Australian sizing is distinct. For example, an Australian king measures 183 cm × 203 cm, while a US king is 193 cm × 203 cm. That 10 cm difference is enough to cause real fitting problems if you purchase based on overseas guides or second-hand information.
Beyond measurements, the right size also affects sleep quality. Research consistently shows that restricted sleeping space leads to more movement, more disturbance between partners, and lighter, less restorative sleep. Picking the right dimensions from the start is an investment in genuinely better nights.
|
Size |
Dimensions (W × L) |
Best For |
|
Single |
92 cm × 188 cm |
Children, teens, guest rooms, compact spaces |
|
King Single |
107 cm × 203 cm |
Older children, taller teens, solo adults |
|
Double |
138 cm × 188 cm |
Solo sleepers who want more room, couples in smaller bedrooms |
|
Queen |
153 cm × 203 cm |
Couples, the most popular size in Australia |
|
King |
183 cm × 203 cm |
Couples who want generous space, master bedrooms |
|
Super King |
203 cm × 203 cm |
Couples seeking maximum space, large master suites |
The single is the go-to choice for children's bedrooms and compact guest rooms. At just under a metre wide, it gives a child plenty of room to spread out without dominating a small bedroom. Pair it with a kids' bunk bed or kids' bed frame and you can fit two beds in a single room quite comfortably.
Keep in mind that very tall teens may start to feel cramped lengthwise — at 188 cm, anyone over about 175 cm will want to consider stepping up to a king single.
The king single is one of Australia's underrated sizes. It's 15 cm wider than a standard single and 15 cm longer — a meaningful difference for growing teenagers or adults who prefer to sleep alone but want more elbow room. It's also a smart choice for narrow rooms where a double would look oversized but a standard single feels too small.
You can explore the full range of king single mattresses to find one that matches your preferred feel, whether that's firm support or a softer, more cushioned surface.
The double sits in an interesting middle ground. For a solo sleeper, it offers generous width — almost 50 cm more than a single — making it ideal for someone who likes to starfish or simply wants more breathing room. For couples, though, it's snug. Each person has roughly 69 cm of space, which is noticeably less than a cot-sized single bed.
If you're a couple on a budget or living in a smaller apartment where floor space is tight, a double can work well. Just make sure the double mattress you choose offers good motion isolation so you're not disturbing each other through the night.
For a detailed breakdown of how the double compares to the next step up, check out the double bed mattress vs queen mattress guide.
The queen is, without question, the most popular mattress size in Australia. It hits a sweet spot: spacious enough for two people to sleep comfortably, yet compact enough to fit in most standard bedrooms (typically around 3 m × 3.5 m or larger).
Each person on a queen gets around 76 cm of width — more than a single bed. That's enough room to change position freely without bumping into your partner. The 203 cm length also accommodates most Australian adults without feet hanging over the edge.
Browse the full selection of queen mattresses, available in a variety of comfort levels — from ultra-firm orthopedic options to plush, pillow-top designs.
The king is where sleep truly becomes luxurious for couples. At 183 cm wide, it gives each person roughly 91 cm — more than a single bed each. If one partner is a restless sleeper, or if you share your bed with a small child or a pet in the mornings, the king size absorbs that extra activity without disturbing the other sleeper.
To make the most of a king, you'll want a master bedroom of at least 4 m × 4 m. This leaves enough space to walk comfortably around the bed frame and fit other essential bedroom furniture — a pair of bedside tables, a dresser, perhaps even a reading chair.
If you're weighing up your options between sizes, the king vs. super king dimensions guide is worth a read.
The super king is the pinnacle of mattress sizing — a perfect square at 203 cm × 203 cm. It's rare for a bed to offer genuinely solo-sized personal space to both partners simultaneously, but the super king does exactly that. It's also popular with families who enjoy weekend morning pile-ons or parents co-sleeping with younger children.
You'll need a generous master suite to do a super king justice — ideally a bedroom of at least 4.5 m × 5 m. If you have the space, the payoff is exceptional. Browse super king mattresses to find a model that supports the weight and movement of two people across all that surface area.
Measure your bedroom before you commit to any mattress size. As a general rule, leave at least 60 cm of clearance on the sides and foot of the bed so you can move freely. This also matters when setting up a complete bedroom suite — you'll want to check that bedside tables and other pieces fit comfortably once the bed is in place.
Solo adult: A double or queen gives a comfortable spread without using unnecessary space.
Couple: A queen is the minimum most couples should consider; a king or super king if space and budget allow.
Children and teens: A single or king single depending on their age, height, and whether they tend to move around a lot during sleep.
Taller individuals (over 185 cm): Look for mattresses with a 203 cm length — king single, queen, king, and super king all offer this.
Restless sleepers, starfish sleepers, and those who tend to radiate heat benefit enormously from extra space. If you or your partner are in any of these categories, going one size up from what you think you need is usually the right call. You can also pair a larger sleeping surface with a mattress protector to keep it fresh for longer.
Naturally, larger mattresses cost more. But the price difference between a queen and a king isn't always as dramatic as people expect — especially during a sale period. It's worth setting a realistic budget range before browsing. If you're working to a specific number, filtered ranges like mattresses under $1,000 or mattresses under $2,000 can help narrow your options quickly.
Different mattress types — pocket spring, cooling gel memory foam, or latex — each have unique properties in terms of motion transfer, temperature regulation, and support. Your chosen size should be available in the mattress type that suits your sleep needs, so check before committing to a brand or model.
💡 Pro Tip: Always measure both your room AND your existing bed frame (if keeping it) before purchasing a new mattress. Australian sizing standards mean that overseas bed frames may not match local mattress dimensions precisely.
A mattress performs best when it's properly supported. Whether you prefer a classic timber slat base, a solid platform, or a fully flexible electric adjustable bed base, the base dimensions must match your mattress size exactly. Mismatched sizes can cause sagging, void warranties, and reduce the lifespan of your mattress significantly. If you're buying both together, consider one of the convenient mattress and base packages that pair perfectly matched sets at great value.
For more on how the base affects your overall sleep experience, the article on why your mattress might feel hard on the wrong frame is an insightful read.
