A small Aussie apartment turns into a Tetris puzzle the moment you start measuring for a bed size to fit in their bedroom. Every centimetre between the wardrobe and the window matters, and a wrong call leaves you squeezing past the mattress at 6am or waking up with a stiff neck because the frame jammed into the wall.

This planner walks you through how to map a mattress size that actually fits a compact floor plan without sacrificing sleep quality. You’ll learn how Aussie mattress sizing differs from US and UK standards, which dimensions suit studios and one-bedders, and how to keep neck and upper back support a priority even in a tight room.

We’re covering measurement rules, layout sketches, mattress feel choices for smaller builds, and a comparison table of Restmaker collections that pair well with restricted floor space. By the end, you’ll have a step-by-step layout plan you can tape out on the floor tonight.

Why does Aussie bed size confuse so many people?

Australian mattress size standards don’t line up neatly with what’s sold in the US, UK, or Europe. A local King is roughly a US Queen plus a bit, and our king size bed dimensions (183cm x 203cm) sit somewhere between an American King (193cm x 203cm) and a US Queen (152cm x 203cm). Meanwhile, the King Single (107cm x 203cm) barely exists outside Australia and New Zealand, which trips up anyone shopping with overseas retailers.

Bed size confusion hits hardest when renters are furnishing a first apartment, recent migrants are setting up a new home, or locals are buying from international online stores. The label looks familiar, the numbers don’t, and the mattress arrives too wide, too short, or shaped for a frame you can’t actually source.

Knowing the local standards saves you money and a return trip. Here’s the quick reference most Aussie layout planners use:

1. What’s the actual measurement breakdown for mattress size?

2. Why is King Single such an Aussie quirk?

The King Single runs 15cm wider than a Single and matches the Queen and King in length (203cm). That extra length matters for taller teens, uni students in studio flats, or any solo sleeper over 180cm who keeps their feet hanging off a standard Single.

Overseas sites often don’t stock it, so you’ll see shoppers buying a Single and adding a mattress topper, or upsizing to a Double and wasting 50cm of floor space they don’t have.

How do you tape out a bed sizing layout before buying?

Grab a measuring tape, some painter’s tape, and a partner if you’ve got one. Mark the mattress footprint on the floor where you think it should go, then walk around it. Open wardrobes. Open drawers. Sit on the edge. Pretend you’re making the bed at 7am half-asleep.

Bed size planning works best with a 60cm clearance rule: leave at least 60cm on the side you climb in from, and 60cm at the foot for walking space. Anything tighter and you’ll be doing gymnastics every morning and bad for same mattress size. For a one-bedroom apartment under 40 square metres, this usually means a Double or Queen, not a king size bed.

Use this quick checklist before you commit:

1. What’s the room measurement checklist?

1. Measure wall-to-wall length and width for bed size of the bedroom at the longest and shortest points.
2. Mark the door swing so the open door doesn’t crash into the bed frame.
3. Note radiator, heater, or AC vents that need airflow clearance.
4. Check window placement. You don’t want the headboard blocking a window you need to open in summer.
5. Allow for bedside tables. They eat up 40-50cm of side space each.
6. Tape out the actual mattress footprint, not just the bed frame.

2. Where should the bed actually sit in a small apartment?

Push the headboard against the longest uninterrupted wall, away from the door swing. In a studio, floating the bed away from the wall turns it into a room divider. In a one-bedder under 9 square metres, a Queen along the 3-metre wall usually leaves a workable walkway on the opposite side.

Honestly, the worst bed size mistake I see is forcing a king size bed into a 3-metre room. You end up with 50cm of squeeze and no room for a desk or wardrobe.

Which mattress size suits a solo sleeper in a studio flat?

Solo sleepers in studio apartments usually land on a Single, King Single, or Double depending on height and sleeping style. A Single works for sleepers under 175cm who don’t move much. A King Single suits taller solo sleepers or anyone who tosses and turns because the extra 15cm of width stops elbow-drops onto the floor.

Mattress size choice also ties to sleep posture in same bed size. Side sleepers need enough width to roll without sliding off the edge. A Double gives that room for one person and doubles as a guest bed when cousins visit for the weekend. The trade-off is floor space. A Double eats up roughly 1.4 square metres more than a King Single.

If your studio is under 20 square metres, measure the gap between the kitchen bench and the bathroom door first. That gap determines whether a Double still leaves you a usable living zone.

1. What about couples in a one-bedroom apartment?

Couples in a one-bedder usually end up on a Queen. It’s wide enough (153cm) for two adults not to feel like they’re sharing a Single, and short enough to leave walking room in most 3.5m x 3.5m bedrooms. A king size bed only fits comfortably in rooms 3.7m wide or larger once you add bedside tables.

For couples where one partner runs hot or shifts a lot, pocket spring systems reduce motion transfer so the still sleeper doesn’t get nudged every time someone rolls over.

2. Does pillow height change with bed size?

Not directly, but the mattress size affects how much room you have for a proper pillow setup. On a Single, a thick pillow plus a folded throw doesn’t fit comfortably. Side sleepers waking up with neck stiffness often blame the pillow when the real issue is that they’re curling into the wall because the bed is too narrow.

A medium-firm mattress paired with a pillow that fills the shoulder-to-neck gap can reduce that morning stiffness. The support underneath matters as much as the pillow on top.

How does mattress feel tie into bed size planning?

Smaller rooms tend to run warmer because there’s less air volume, and a soft plush mattress can trap heat around the body. A medium-firm feel usually balances support with airflow better in a confined space, especially for sleepers waking with neck or upper back stiffness.

The iSleep Support collection from Restmaker uses gel-infused foam and firm pocket springs, which suits sleepers who want firm support without the hard-as-board feel. The bamboo cover adds breathability, which matters when your bedroom window is 2 metres from the bed size.

For tight apartments where the bed sits 30cm from a heater or a sunny window, breathability and temperature regulation often matter more than plush cushioning. A firmer, cooler sleep surface keeps the body from sinking into a heat pocket overnight.

1. What specs actually help with morning stiffness?

For sleepers waking with a stiff neck, the combination that tends to work is firm adaptive pocket springs plus gel-infused foam. Pocket springs push back the moment you shift position, so your spine doesn’t stay locked in one posture all night. Gel foam draws heat away from the shoulders and neck.

The iSleep Support is built this way: individually wrapped firm pocket springs for adaptive support, gel-infused foam for pressure relief, and edge support coils so you can sit on the side to put socks on without the edge collapsing. Each Restmaker mattress is Australian-designed by a team with 25-plus years in the industry, engineered layer by layer to proprietary specs.

2. Is firm too firm for side sleepers?

Not necessarily. Side sleepers need pressure relief at the shoulder and hip, but they also need the spine to stay level in same bed size. A mattress that’s too soft lets the hip sink, tilting the spine and pulling the neck out of alignment overnight. A medium-firm feel with a comfort layer often hits the spot.

Look for a mattress size and feel combo where the comfort layer is responsive rather than memory-foam slow. Responsive foam pushes back as soon as you shift, so you don’t wake up stuck in a crater.

Which Restmaker mattress fits which size for small apartments?

Picking the right bed size is half the layout battle. Picking a mattress engineered for compact, warmer rooms is the other half. Restmaker’s iSleep Support comes in Single, Double, Queen, and King, all built around firm pocket springs, gel foam, and a breathable bamboo cover.

Here’s a side-by-side of how each size stacks up for apartment use:

1. Restmaker iSleep Support size comparison

2. What about delivery and trial?

The iSleep Support range comes bed-in-a-box, compressed and roll-packed, so it fits through apartment doorways and up tight stairwells without a delivery team wrestling a full mattress up three flights.

Each mattress includes a 100-night sleep trial, so you can sleep on it through a few warm summer weeks before deciding. If it doesn’t suit, returns are hassle-free. Note that not all collections include free delivery. Some lines ship with fast Sydney dispatch instead of free metro delivery, so check the product page before ordering.

What’s the step-by-step bed size layout plan?

Here’s the planner you can run tonight with a tape measure, some painter’s tape, and a phone for notes. It works for studios, one-bedders, and small master bedrooms where every centimetre counts.

Step 1: Measure twice. Grab wall-to-wall dimensions at floor level and at bed-head height. Corners aren’t always square, especially in older apartments.

Step 2: Tape the footprint. Mark out your shortlisted mattress size options on the floor with painter’s tape. Live with each mark for an hour. Open wardrobes, sit on the edge, walk the path from bed to bathroom.

Step 3: Check the path of travel. Make sure the door can swing fully and you can walk from bed to bathroom without side-stepping.

Step 4: Match the feel to the sleeper. Solo side sleepers and couples waking with stiffness usually need medium-firm with responsive foam, not a soft plush surface.

1. How do you handle unusual apartment layouts?

L-shaped bedrooms, bedrooms with built-in desks, or rooms where the window sits in the corner all need a custom plan bed size. Tape out a few configurations and photograph them from above.

In an L-shape, the bed usually tucks into the shorter wall opposite the entry. In a room with a low window, keep the headboard below the sill so you can still open it for airflow. Apartment airflow is underrated: a hot bedroom produces restless sleep and morning stiffness almost as much as a bad mattress does.

2. What mistakes should you avoid?

Three common traps. First, sizing up because you think you’ll grow into a king size bed. You won’t, and the squeeze will annoy you daily. Second, ignoring the door swing and then discovering the door hits the frame every morning. Third, forgetting bedside table space. A bed size without a 50cm side table zone is a phone-on-the-floor situation.

Pick the smallest mattress size that lets you and your partner sleep without shoulder contact. That’s the sweet spot.

The End Game

A small apartment doesn’t mean a small sleep setup. It means a smarter one. Tape out the footprint, match the bed size and mattress size to the room and the sleeper, and pick a feel that supports rather than sinks.

For most compact Aussie apartments, a Double or Queen iSleep Support hits the balance. The firm pocket springs and gel foam reduce that morning neck stiffness without making the bed feel like a slab, and the bamboo cover breathes well in warm rooms. The bed-in-a-box format also means delivery into tight stairwells isn’t a drama.

Your next step: grab a tape, mark out your shortlisted bed size tonight, and check the iSleep Support range to find the configuration that suits your room. The 100-night sleep trial gives you a full season to decide if it’s right.