Double bed size in Australia is 138cm wide by 188cm long, while a standard queen size bed runs 153cm by 203cm. That 15cm jump in width and 15cm in length is the entire room layout maths most shoppers miss when weighing a double bed vs queen bed size decision for a small Australian bedroom.

The hard part isn’t the numbers themselves. It’s what those numbers actually do once you measure your doorframe, wardrobe swing, and bedside clearances. Australians shopping online often assume a “double” means the same thing globally — it doesn’t. A US full is 134.5cm wide. Our double is wider. A US queen is 152.4cm wide. Our queen runs 153cm. Close, but not identical, and frame importers frequently ship the imperial size, not the Australian standard.

This guide walks through the working maths: how to measure your room, how to read the difference between double bed size and queen size bed floor footprints, and how to pick a mattress that suits the space you actually have. Restmaker has spent over 25 years in the Australian mattress industry — from the factory floor to the showroom floor — so we’ll frame this in terms of how locals really furnish small bedrooms and guest rooms.

Australian standard dimensions sourced from the Sleep Health Foundation Australia sizing guide (2023).

How does double bed size compare to queen size bed floor space in a small bedroom?

Double size takes up roughly 2.59 square metres of floor footprint. A queen size takes 3.10 square metres. The 0.51 square metre gap sounds tiny on paper, but in a 3m x 3m spare bedroom it eats 5.7% of your usable floor area. That’s the difference between fitting a small desk and not fitting one.

Working out the maths:

• Double: 138cm wide × 188cm long = 2.59m²
• Queen: 153cm wide × 203cm long = 3.10m²
• Footprint jump: 0.51m² — about half a square metre extra floor space gone
• Wall length required: Double needs at least 188cm of clear wall; queen needs 203cm

When you’re running the double bed vs queen bed size maths against your actual bedroom, the question isn’t which is “better.” It’s which leaves you enough floor to walk around the bed without sideways shuffling.

For Australian apartments under 10m² total, the double wins on layout alone. For master bedrooms north of 12m², the queen size bed fits without crowding the wardrobe.

1. What clearance do you actually need around the bed?

The commonly cited 60cm to 70cm walking clearance around the sides and foot of the bed isn’t a marketing number — it’s based on ergonomic research into comfortable bedroom circulation (Impacts of thermal adaptive behaviors in bedrooms on sleep quality and thermal comfort in the tropics, 2025).

A bed size in a 2.8m-wide room leaves you 71cm on each side. A queen in the same room leaves 63.5cm. Both technically pass the clearance test. But the queen leaves zero margin for a partner, a child, or a dog rounding the corner at speed.

For doorways: measure the inside of the frame from jamb to jamb. Australian standard internal doorframes are usually 82cm wide. A queen mattress stands on its side at 153cm in queen size bed — it won’t fit through a standard door without tilting onto the long edge. A double at 138cm also won’t fit flat. Plan your delivery route before you order.

2. Does a bigger mattress actually sleep cooler in a small room?

Not always, and not for the reason you’d think. More mattress surface area doesn’t cool you down by itself — but it does give two sleepers room to stop generating heat in each other’s pocket. The CSIRO’s 2021 review on thermal comfort in bedding flagged body heat pooling between co-sleepers as a leading cause of night-time wake-ups.

So if you’re solo, a double bed size can actually sleep cooler per square metre because you’re not generating heat for a second body. If you’re a couple, the extra 15cm of queen size bed width lets each sleeper drift to their own thermal zone.

3. When does the maths break in favour of queen?

Three situations, in order of how often I see them in the Restmaker customer inbox:

• Your bedroom is over 3.2m on its shortest wall. A double bed size looks lost in that space.
• You share the bed with a restless partner or a pet. The 15cm matters.
• Your doorframe, hallway, and stairwell all measure over 154cm at their tightest diagonal — queen delivery is painless.

When none of those apply, the double wins on pure room layout maths.

Which mattress type and feel suits the size you pick?

A mattress that flattens out in three years ruins the maths, no matter how smart the dimensions looked on day one. The size decision is only half the puzzle for double bed size or queen size bed — the feel and the build quality decide whether you’ll still be sleeping well in year five.

Restmaker’s range splits into three feels that map neatly onto different sleeper profiles and room sizes:

• iSLEEP DELUXE — Medium feel, bamboo cover, gel foam, edge support coils. Suits couples and warm sleepers in master bedrooms.
• iSLEEP EZEE — Medium feel, gel foam, lighter build. Suits single sleepers, guest rooms, and kids’ rooms where a double is the right size.
• iSLEEP SUPPORT — Firm feel, gel-infused foam, firm high-resilience foam. Suits back and stomach sleepers, heavier builds, and anyone who wants firmer support.

If you’re picking a double bed size for a spare room or a kid’s bedroom, the iSLEEP EZEE hits the weight-to-comfort ratio that makes sense — lighter to move, easier to rotate, and built for single sleepers. If you’re picking a queen size bed for a master bedroom with a partner, the iSLEEP DELUXE gives you the edge support and bamboo breathability that pays off over years of shared sleep.

1. What feel works best for solo sleepers on a double?

MEDIUM. Not because medium is a marketing middle ground — because a solo sleeper on a double bed size benefits from contouring that distributes weight across the smaller surface area. A medium-feel gel foam like the iSLEEP EZEE spreads pressure without letting you sink into a hammock shape. Firm mattresses on a double can feel like sleeping on a board for lighter builds (under 70kg).

Heavier solo sleepers (over 90kg) are the exception — a firm high-resilience foam like the iSLEEP SUPPORT holds its shape better under sustained load.

2. How does edge support change the maths on a queen?

Edge support coils extend the usable sleep surface right to the perimeter. On a queen size bed, that’s where the extra 15cm of width actually gets used — partners tend to drift to the edges over the night, and without reinforced perimeter coils, that edge sags first. The iSLEEP DELUXE bakes edge support coils into the build specifically because queen mattresses fail at the edges faster than double bed size, given the wider span.

If you’re choosing between double vs queen size for a couple, factor edge support into the queen decision. Otherwise you’re paying for width you can’t use.

What does the double bed vs queen bed size comparison look like side by side?

The table below puts the working maths in one place. Prices are current as of November 2025 on the Restmaker site and represent sale pricing across the iSLEEP range.

The double bed vs queen bed size decision usually lands on three numbers: room length, doorway diagonal, and who’s sleeping in it. Two out of three in the double column, save your money and the floor space.

1. How do you measure your bedroom before ordering?

Three measurements, in order:

1. Wall to wall on the shortest axis — this decides if the bed fits with walking clearance on both sides.
2. Wall to wall on the longest axis — this decides if the bed’s length clears the wardrobe or window without blocking the door.
3. Doorframe diagonal — measure corner to corner. If the queen’s 153cm width is bigger than this, you’ll need a king-single route or a flat-pack assembly in the room.

Australian bedrooms in apartments built before 2000 often have stud walls that aren’t square. Measure twice. I’m not 100% sure why older apartments drift on the diagonal, but your tape measure won’t lie.

2. What about the King Single that doesn’t exist overseas?

This is the part that confuses newcomers furnishing their first Australian home. There’s no “King Single” size in the US, UK, or European mattress standards. It’s an Australian and New Zealand thing — 107cm × 203cm. It’s longer than a single but narrower than a double bed size, and it’s the standard for kids’ rooms, teen bedrooms, and slim spare rooms where a double feels too wide but a single feels too short.

If you’re shopping on an overseas website and see “King Single,” check the dimensions before you order. Most US retailers will simply not list it at all. It’s the clearest signal that mattress sizing isn’t a global standard, and that an Australian-sized double is not the same as a US full.

What room layout mistakes cost the most when picking a size?

Five mistakes I see weekly in customer queries. Skip any one of these and you’re fine. Hit two and the bed ends up returned.

• Forgetting the wardrobe door swing. A 50cm-deep wardrobe door needs 50cm of clear floor to open. Measure from the wardrobe edge to the side of the proposed bed, not to the wall.
• Ignoring the power point position. Lamp, phone charger, and electric blanket leads all need a reachable socket. A queen  size bed pushed against a wall without a power point means extension cords across the floor.
• Trusting the listed mattress size over the frame size. Some imported bed frames ship in non-Australian dimensions. Measure the inside of the frame from slat to slat. If it’s more than 2cm off the standard 138 × 188 or 153 × 203, the mattress will sit unevenly.
• Buying the bigger size to “future-proof”. If you live solo now and your room is under 10m², a queen size bed don’t need is just floor space you’re losing. The maths doesn’t care about hypothetical future partners.
• Skipping the doorframe check on the second floor. A queen mattress delivered up a narrow stairwell with a tight turn at the landing won’t make it. Measure the diagonal at the tightest point.

Run through this list once and the double bed vs queen bed size maths stops being theoretical.

How do you choose the right size for your sleep setup?

A buyer decision framework, in plain language. Three questions, in this order:

1. Who is sleeping in this bed? Solo sleeper or one parent with a child sharing occasionally — double. Two adults sharing full-time — queen.
2. What’s the shortest wall in the room? Under 2.5m — double strongly preferred. Over 3m — queen fits without crowding.
3. Is the doorframe diagonal over 154cm? If no, queen delivery needs a flat-pack plan. Double always gets through.

If your answers land double bed size on all three, the iSLEEP EZEE in double is the practical pick. If you answer queen on at least two, the iSLEEP DELUXE in queen is the working choice. If your main concern is firmer support — say you’re a back or stomach sleeper with a heavier build — the iSLEEP SUPPORT delivers the firm high-resilience foam that holds shape under sustained pressure better than standard foam.

Restmaker’s range is engineered by a team with over 25 years of mattress industry experience, developed according to proprietary Australian specifications, and built to strict quality standards by trusted global manufacturing partners. That phrase — “Australian-designed” — is doing real work here. It means the sizing, the foam densities, and the cover fabrics were specified for Australian climate conditions, Australian homes, and Australian comfort expectations. Not adapted from an overseas template.

For tight budgets, the iSLEEP EZEE Double at AUD 159 on sale (down from AUD 229) is hard to beat for a guest room or kid’s bedroom. For couples in a master bedroom who want long-term durability, the iSLEEP DELUXE mattress for Queen  size bed at AUD 449 on sale (down from AUD 719) is the working answer.

Both come with a 100-night trial on mattresses, OEKO-TEX® Standard 100 and CertiPUR-US® foam certification, and the same engineering pedigree Restmaker has built since 1997.

Future outlook

The double bed size vs queen size bed maths comes down to three numbers: shortest wall, doorway diagonal, and who’s sharing the bed. Two out of three in the double column, the iSLEEP EZEE is the practical pick — engineered by a team with over 25 years of mattress industry experience, CertiPUR-US® certified foam, and a 100-night trial. Three in the queen column, the iSLEEP DELUXE delivers the edge support and bamboo breathability that pays off over years of shared sleep.

Australian mattress sizing has stayed consistent for decades — but the room sizes around us haven’t. Apartments keep getting tighter, wardrobes keep getting bigger, and the working maths matters more now than it did in 1997 when Restmaker started. Measure your room. Measure your doorframe. Match the mattress to the sleeper and the space, not to the marketing.

Next step: Grab a tape measure, run through the three-question framework above, and browse the Restmaker mattress range with your actual numbers in hand. Fast Sydney dispatch is available on selected collections; free Sydney metro delivery applies to others — check each product page before checkout.