Mattress Sizes Australia: Every Bed Size in cm, Drawn to Scale

Australia has five standard mattress sizes: single (92 × 188 cm), king single (107 × 203 cm), double (138 × 188 cm), queen (153 × 203 cm) and king (183 × 203 cm). Two less common sizes sit around them — the long single (92 × 203 cm) and the super king (203 × 203 cm) — and the standard cot mattress is 130 × 69 cm. Those are the numbers you’ll find on Sleeping Duck’s and Origin’s spec sheets, on IKEA Australia’s mattress pages and in Forty Winks’ size guide, and they are not the same as American or British sizes, even when the names match.

Two things are worth knowing before you measure anything. First, there are really only two lengths in Australia: 188 cm (single and double) and 203 cm (everything else). Length is the dimension people forget, and it is the one that decides whether a tall teenager’s feet hang off the end. Second, “standard” sizes still wobble by a centimetre or two between brands. Origin says its dimensions “may vary slightly (max. +/- 2 cm)”. Sealy lists its double at 138.5 × 190 cm and its king at 183.5 × 203 cm. CHOICE notes that doubles are “generally 137 x 187cm” and that IKEA’s queen measures 152 × 202 cm. Pillows.com.au even lists the king single as 106 × 203 cm in one table and 107 × 203 cm in another.

None of that matters in practice. CHOICE’s own verdict is that a centimetre or so “is unlikely to affect placement on mattress bases”, with the only casualty being a slightly looser fitted sheet if you like them drum-tight. IKEA Australia states that its mattresses are compatible with standard Australian bed sizes. So treat the chart above as the real-world standard and don’t panic if a listing is out by a centimetre. Where you should panic is when a listing is out by ten centimetres — that usually means it is an imported US or UK size wearing an Australian name, which we cover in the AU vs US vs UK section.

This page is the Australian deep-dive. If you are in the US, our US mattress size guide covers twin to Alaskan king in inches, and UK readers should head to UK mattress sizes. If you already know your size and just want a bed, our best mattress Australia ranking has five picks with tester and owner data.

Numbers in a table hide how different these beds really look in a room. The diagram below draws every Australian size on the same grid, so a super king fills its tile completely and everything else is shown in proportion. Notice how the double is wide but stops short at the dashed 188 cm line, while the king single is narrow but runs the full 203 cm. That trade-off is the single most common sizing mistake we see Australians make when buying for teenagers.

The jump from queen to king (30 cm of width) is the same as the jump from double to queen plus another 15 cm. The jump from king to super king adds 20 cm of width and nothing else. And the cot, at 69 × 130 cm, is a different category altogether — it is governed by a safety standard rather than by retail convention, which is why it gets its own section at the end of this guide.

An Australian single mattress is 92 × 188 cm. That’s the figure on Sleeping Duck’s, Origin’s and IKEA Australia’s listings; a few retailers, including Finder Shopping and Pillows.com.au, list it as 92 × 187 cm. It is the narrowest adult-length bed in Australia and the default for children’s rooms, bunk beds and small spare rooms.

The limiting factor is length. Finder Shopping’s rule of thumb is that a mattress should be about 10 cm longer than you, which puts the ceiling for a single at roughly 178 cm tall. That is fine for most kids and many adults, but it is exactly the height a lot of teenage boys pass at 15 or 16. If you are buying a bed for a child who is going to keep growing, a single is a bed you will probably replace.

That is what the long single (also sold as a single XL or single extra long) is for. It keeps the single’s 92 cm width and adds 15 cm of length, taking it to 92 × 203 cm. It is a good answer for narrow rooms, boarding houses and tall kids whose room can’t take anything wider. The catch is availability: most direct-to-consumer brands don’t make one — Sleeping Duck’s Mach II, for example, comes in six sizes and the long single isn’t one of them — and long-single sheets are harder to find than king-single ones. For most families, the king single is the better-supported version of the same idea.

• Buy a single if: it’s for a child under about 12, a bunk, or a room under about 2.4 m wide.
• Skip it if: the sleeper is already near 170 cm, or it’s for an adult’s main bed.

A king single mattress is 107 × 203 cm — 15 cm wider and 15 cm longer than a standard single. It is one of the most-searched mattress sizes in Australia, and it has no exact equivalent in the US or UK. American twin XLs share its 203 cm length but are 97 cm wide; British beds don’t come in a 203 cm length at all.

Retailers consistently pitch it at the same buyers. Finder Shopping recommends it for growing kids and teens who are likely to outgrow a single, and it is the bed we would buy for any child aged ten and up. The 203 cm length handles sleepers up to roughly 193 cm by the 10 cm rule, so it will see a kid through high school and well beyond. That same length makes it a genuinely good adult bed for one person: share-house rooms, granny flats, a parent’s second bed, a tall single adult in an apartment where a double would swamp the room.

The king single versus double question comes up constantly, and the answer depends on whether you need length or width. A double is 31 cm wider but 15 cm shorter. If the sleeper is tall, the king single wins outright — a double’s 188 cm length will leave a 185 cm teenager with their feet off the end. If the sleeper is short and sprawls, or you want the option of two people occasionally, the double wins. Surface area favours the double (2.59 m² against 2.17 m²), but for one tall person it is the wrong shape.

The king single is also, in our price analysis below, the best-value size per square metre in the one AU range we could price across every size. Single beds are poor value per square metre because they are priced close to the king single — Sleeping Duck lists the single at A$999 and the king single at A$1,099. Our Australian mattress rankings already flag “smaller sizes are poor value” as a con for the Mach II, and the per-square-metre numbers back that up.

A few practical points. King single bases and frames are wider than the mattress by a few centimetres, so measure the room for the frame, not just the mattress. King single mattresses fit through doorways and up stairs with no fuss, which isn’t true of a hybrid king. And if you are buying for a growing child, look at our best mattress for kids guide for what to prioritise in the mattress itself.

An Australian double mattress is 138 × 188 cm. Sleeping Duck, Origin and IKEA Australia all list it at 138 × 188 cm, CHOICE says doubles are “generally 137 x 187cm”, and Sealy’s own double runs to 138.5 × 190 cm. It is the closest Australian size to an American full (137 × 191 cm) and a British double (135 × 190 cm), which makes it the easiest size to buy imported linen for.

The double’s problem is that it was once the default bed for couples, and it isn’t big enough for that anymore. Split two ways, it gives each adult 69 cm of width — narrower than a single bed gives one child. Add the 188 cm length and anyone over about 178 cm is cramped on two axes. Finder Shopping still lists it as suiting solo sleepers or couples, and two people can certainly share one, but if this is the main bed for two adults, it is the wrong size.

Where the double shines is as a solo adult’s bed in a room that can’t take a queen, or as a guest bed. On Sleeping Duck’s pricing it is 18% cheaper than the queen version of the same mattress, so for a spare room that gets used a few weekends a year, it is the sensible choice. For a teenager, though, we would pick a king single over a double almost every time, for the length.

• Buy a double if: you sleep alone, like to sprawl, are under about 178 cm and your room is under about 2.9 m wide.
• Skip it if: it’s for two adults every night, or for anyone tall.

An Australian queen mattress is 153 × 203 cm. It is the best-selling size in the country, the default “master bedroom” bed, and the size almost every mattress review and price you see is quoted in. CHOICE puts it plainly: “Queen mattresses in Australia are 203cm long and 153cm wide, while thickness varies between models.” Sealy lists 152.5 × 203 cm and IKEA’s queen measures 152 × 202 cm — all the same size for the purposes of bases and sheets.

For couples, the queen is the minimum we would recommend: 76.5 cm per person, and the full 203 cm length that suits sleepers up to roughly 193 cm. It fits in most Australian bedrooms (see the room guide below — about 2.7 × 2.6 m is the tight minimum for the mattress alone), it is easy to find sheets for, and every brand makes one. It is also the size where competition between brands is fiercest, so it is where you get the best deals. CHOICE notes that Koala’s queen mattresses alone range from A$950 to A$2,390 depending on model.

Good news for anyone buying from overseas: the Australian queen is effectively the same as a US queen (60 × 80 inches, about 152 × 203 cm). US queen sheets fit an AU queen, and so does a US queen mattress protector. The British are the trap here — a UK “king” (150 × 200 cm) is roughly a slightly small Australian queen, and a UK “queen” isn’t a standard size at all.

If you share a queen and one of you is a restless sleeper, motion isolation matters more than an extra 30 cm. Our best mattress for couples guide covers which constructions damp movement best.

An Australian king mattress is 183 × 203 cm. That’s 30 cm wider than a queen and the same length. Sleeping Duck, Origin and IKEA Australia all list 183 × 203 cm; Sealy’s is 183.5 × 203 cm. Each sleeper gets 91.5 cm of width — essentially a single bed each, which is why couples who upgrade from a queen often describe it as the end of elbow wars.

The Australian king is not the American king. A US king is 76 × 80 inches — about 193 × 203 cm — so it is 10 cm wider. The Australian king’s 183 cm width actually matches the US California king, but the Cal king is 213 cm long. In practice this means US king sheets will bag around the sides of an AU king, and an imported US king mattress won’t fit an Australian king base. The UK’s super king (180 × 200 cm) is the closest British match, about 3 cm smaller each way.

Before buying a king, check three things. The room: you want roughly 3.0 m of wall for the bedhead at minimum and about 3.3 m to be comfortable. The access: a king hybrid like Origin’s weighs 43 kg (against 36 kg for the queen), and Sleeping Duck’s Mach II stands 31 cm tall — fine in a box, a two-person job once unpacked. And the price: on the Sleeping Duck range, a king is A$350 more than a queen for 20% more sleeping area. If the bed is mainly for two adults plus a dog or a toddler, that’s money well spent. Our best king size mattress guide has more on choosing one.

An Australian super king mattress is 203 × 203 cm — a perfect square. Sealy Australia describes it as offering “an additional 19.5cm in width to the King and an impressive 50.5cm to the Queen”, measured against its own 183.5 cm king and 152.5 cm queen. Sleeping Duck makes the Mach II in a 203 × 203 cm super king, and Amart lists the size alongside the standard five.

It is a niche size. Pillows.com.au calls it “Not very common as a mattress size, but more popular for bed linen” — many people buy super king quilts for a king bed to get more overhang. As a mattress, it makes sense for co-sleeping families, two large adults, or a couple with a big dog who refuses to sleep on the floor. For almost everyone else, a king does the job for considerably less.

Sealy’s room advice is to treat it as a master-bedroom bed — it notes that “a master bedroom is often 20 square metres” — and to leave 75 to 90 cm of clearance on all sides. On our arithmetic, that means about 3.5 × 2.8 m for comfortable access to the mattress alone. Super kings are also the most expensive size per square metre in the one range we priced: on Sleeping Duck, A$2,699 against A$1,999 for a king, so you pay A$700 extra for 20 cm more width.

There is no Australian Standard for bedroom clearance, so room sizing comes down to two industry rules of thumb. Finder Shopping cites the interior-design convention of leaving 60 cm of clearance around the sides of the bed. Sealy recommends more: “a clearance of 75 to 90cm on all sides”. We’ve taken both and done the arithmetic for each size, assuming the bedhead sits against a wall and you need clearance on both long sides and the foot.

Read the first number as the room width (the wall the bedhead goes on) and the second as the room depth. A typical 3 × 3 m secondary bedroom takes a queen comfortably and a king only just — you’ll have about 58 cm either side of a king, which is passable but leaves no space for bedside tables. A 2.7 × 3 m kids’ room comfortably takes a king single with space for a desk, and a double tightly.

Remember these are mattress-only numbers. Bed frames and bases are often 5–10 cm larger than the mattress, Finder Shopping warns that frames add bulk, and a chunky upholstered bedhead can eat another 10 cm of depth. If you plan wardrobes on the side wall, you need more space in front of their doors than the bed clearance. Measure the room, subtract the frame’s footprint (not the mattress’s), and see what’s left.

If you just want the answer, here it is. Most adults sleeping alone should get a king single or a queen; most couples should get a queen or a king; most kids should get a king single from around age ten. The cards below give the full picture, including who should skip each size.

The two mistakes we’d steer you away from: buying a double for two adults to save a few hundred dollars (you’ll each have less width than a single), and buying a single for a pre-teen (they’ll outgrow its 188 cm length before the mattress wears out). For the mattress itself, not just the size, our how to choose a mattress guide walks through firmness, materials and sleeping position.

Every brand prices its sizes differently, and Australian brands discount so often that list prices are only a rough guide. To show the shape of the price curve, we took one mattress that is sold in all six sizes with published prices — Sleeping Duck’s Mach II, which Tom’s Guide AU names its best overall Australian mattress — and divided each price by the sleeping surface.

Three patterns stand out. First, the king single is the cheapest per square metre (about A$506/m²) and the single the most expensive below super king (about A$578/m²) — a single costs only A$100 less for 20% less bed. Second, double, queen and king cost almost the same per square metre (A$520–538), so you are paying for space, not a size premium. Third, the super king carries a real premium — about A$655/m², with A$700 extra over the king for 11% more surface.

The same logic usually holds for other Australian brands. Origin sells its hybrid in the five core sizes, from 21 kg for a single to 43 kg for a king; its site shows sale prices that change too often to tabulate. Our Australia mattress guide lists queen prices for Koala (A$1,249 RRP), Origin (A$711.55, Oct 2026), Ecosa Pure (A$1,740 RRP) and the Emma Comfort Protect (A$1,479 RRP). Use the queen as your anchor: on Sleeping Duck’s ladder, a double is about 18% cheaper and a king about 21% dearer.

The takeaway: don’t downsize to save money unless you’re dropping a whole size category. Going from queen to double saves A$300 on the Mach II but costs each person 7.5 cm of width and 15 cm of length. Going from single to king single costs A$100 and buys a bed that lasts until the kid leaves home.

Size names don’t travel. The queen is the only Australian size that has an exact equivalent in the US, and Britain doesn’t use the word “queen” for a standard bed at all. This matters if you buy bedding from overseas sellers, move here with furniture, or read a mattress review written for another market. Always compare in centimetres.

The safe swaps: US queen sheets on an AU queen, and US full or UK double sheets on an AU double. The risky ones: US king sheets on an AU king (10 cm too wide, so they bag and wrinkle), UK king sheets on an AU queen (about 3 cm short each way, so they’re tight and may ping off), and anything at all for a king single or super king, which have no overseas equivalent. US twin sheets on an AU single are 5 cm wider but usually fine.

New Zealand mostly shares Australian sizes, with one exception worth knowing: Sheridan sells a separate “NZ King” fitted sheet at 168 × 203 cm, narrower than an Australian king. If you’re buying linen from a trans-Tasman retailer, check you’re not in the NZ king listing. For the full US range (including Cal king and Alaskan king), see our US mattress sizes guide.

Australian linen is sized to Australian mattresses, with a little stretch built in. Sheridan, one of the biggest local linen brands, lists its fitted sheets at 91 × 190 cm (single), 107 × 203 cm (king single), 137 × 190 cm (double), 152 × 203 cm (queen), 180 × 203 cm (king) and 203 × 203 cm (super king). They are slightly smaller than the mattress on some dimensions because the elastic corners pull them tight.

The number most people forget is pocket depth. Sheridan’s standard fitted sheets have a 40 cm wall; its queen, king and super king come in 50 cm “multi depth” versions too. Modern mattresses are getting taller — Sleeping Duck’s Mach II is 31 cm and Origin’s Hybrid 27 cm — so a 40 cm pocket leaves about 9 cm of room on the Mach II for a mattress protector and topper. If you add a thick topper (see our best mattress topper guide), go straight to a 50 cm pocket.

Quilt covers are sized for overhang rather than to match the mattress. Sheridan’s are 140 × 210 cm (single), 180 × 210 cm (double), 210 × 210 cm (queen), 245 × 210 cm (king) and 270 × 240 cm (super king). If you and your partner fight over the doona on a queen, a king quilt on a queen bed is a cheap fix.

The usual Australian cot mattress is 1300 × 690 mm (130 × 69 cm), and unlike adult beds, this one is a safety matter rather than a convenience. Cots sold in Australia must meet the mandatory standard AS/NZS 2172. Adairs’ cot instructions, citing AS/NZS 2172:2013, specify a 1300 × 690 × 130 mm mattress and explain that the width and length are set so gaps “will not exceed 40mm when the mattress is pushed to one side or end, and 20mm when the mattress is centred”, to minimise the risk of a child’s limb becoming caught.

The Victorian Government’s Better Health safe sleeping checklist says the mattress should be “firm, clean, well fitted and flat”, with “no more than 20mm gap between mattress and cot sides and ends when centred”, and should meet the voluntary mattress standard AS/NZS 8811.1:2013. Note that Better Health cites the 2003 edition of the cot standard while Adairs cites 2013; both use the same 20 mm and 40 mm gap limits.

The rule that overrides everything: buy the mattress size printed on your cot, not a generic “cot size”. Some cots, including some imported ones, call for slightly different dimensions. A US crib mattress (about 69 × 130 cm per Zoma’s guide) is close to the Australian size, but close isn’t the test — the gap is. Don’t add a second mattress or a thick topper either; Adairs warns the maximum thickness should not exceed 130 mm, because a taller mattress shortens the cot’s side height.