Choosing a mattress size is partly about who will sleep on it, but it is also a room-planning decision. The bed needs to fit through the home, sit on the correct base and leave enough space for doors, drawers and everyday movement.
Quick answer: Australian mattress names are familiar, but exact dimensions can vary slightly between manufacturers. Always compare the mattress specification with the internal dimensions of your bed frame. BOXY currently offers Single, Double, Queen and King hybrid mattresses, all with a 30cm profile.
Australian mattress size chart
The ranges below are a practical guide to common Australian mattress dimensions. They show why checking the exact product specification matters, especially when a bed frame, fitted sheet or room layout has little spare tolerance.
| Mattress size | Common guide range (width x length) | Often considered for | BOXY option |
|---|---|---|---|
| Single | About 91-92 x 188-190cm | Children, teenagers, compact bedrooms and one sleeper | Yes |
| Long Single / Single XL | About 91-92 x 203cm | Taller single sleepers and split guest-room layouts | No |
| King Single | About 105-107 x 203cm | Taller teenagers or one sleeper wanting extra width | No |
| Double | About 137-139 x 188-190cm | One sleeper wanting more width, guest rooms and smaller bedrooms | Yes |
| Queen | About 152-153 x 203cm | Couples, main bedrooms and larger guest rooms | Yes |
| King | About 183-184 x 203cm | Couples wanting more personal width in a larger bedroom | Yes |
| Super King | About 203 x 203cm | Very large bedrooms and sleepers prioritising maximum width | No |
These are market guide ranges rather than a universal fixed standard. Mattress construction, handmade tolerances and brand specifications can create small differences. A bed frame is also usually wider and longer than the mattress it supports.
Exact BOXY Hybrid Mattress dimensions
The BOXY Hybrid Mattress combines memory foam comfort layers with pocket spring support. Its four available sizes use the following finished mattress dimensions:
| BOXY size | Width | Length | Height | View size |
|---|---|---|---|---|
| Single | 92cm | 188cm | 30cm | View Single |
| Double | 138cm | 188cm | 30cm | View Double |
| Queen | 153cm | 203cm | 30cm | View Queen |
| King | 183cm | 203cm | 30cm | View King |
Use these exact dimensions when checking a BOXY mattress against a base, frame, fitted sheet or room plan. The broader chart is useful for initial comparison, but the product specification should make the final decision.
Mattress size is not the same as bed frame size
A mattress measurement describes the sleeping surface. A complete bed can occupy more floor space because the frame may include side rails, an upholstered headboard, a footboard, drawers or an overhanging platform.
Before buying, check two separate measurements:
- Internal frame dimensions: the opening that supports the mattress.
- External frame dimensions: the full width and length that will occupy the room.
A frame can be labelled Queen while still having external dimensions several centimetres larger than a Queen mattress. If you are keeping an existing frame, measure its internal opening rather than relying only on the label.
How to measure a bedroom before choosing a mattress
- Measure the usable room: record wall-to-wall dimensions, then mark doors, windows, wardrobes, vents and power points.
- Add the complete bed footprint: use the frame's external size when available. If you have not chosen a frame, allow extra space beyond the mattress outline.
- Mark it on the floor: use painter's tape or sheets of paper to outline the proposed bed. This makes the scale easier to judge than numbers alone.
- Test movement: walk the route from the doorway to the wardrobe and both sides of the bed. Check whether drawers, doors and windows can open fully.
- Allow for bedside furniture: include bedside tables, lamps, charging cables and any drawer clearance in the plan.
- Check delivery access: measure the narrowest doorway, stair turn or lift opening for the bed base as well as the mattress.
For smaller homes, the small apartment furniture guide provides a broader room-planning checklist.
Single vs Double mattress
A Single mattress preserves the most floor space and can suit a child's room, a compact guest room or one adult sleeper. Moving to a Double adds roughly 46cm of width in the BOXY range, while the length remains 188cm.
That additional width can make a meaningful difference for one sleeper who changes position often. It also increases the room footprint, so compare the extra width with wardrobe access and walking space rather than assuming the larger option will fit.
Double vs Queen mattress
The BOXY Queen is 15cm wider and 15cm longer than the BOXY Double. The extra length is important for taller sleepers, while the added width gives two sleepers more personal space.
A Double may be easier to place in a smaller guest room or apartment bedroom. A Queen is often the more flexible long-term choice for a main bedroom when the full bed frame still leaves a practical route around the room.
Queen vs King mattress
The BOXY Queen and King are both 203cm long. The King adds 30cm of width, bringing the sleeping surface to 183cm wide. That difference is substantial in both sleep space and floor planning.
Measure the external frame, not just the mattress, and check the remaining space on both sides. A King can feel generous in a large room but may restrict wardrobe doors or make bedside storage awkward in a tighter layout.
Why mattress height matters
Width and length decide whether a mattress fits the room, but height affects the finished bed and the bedding you need. Every BOXY Hybrid Mattress size is 30cm high.
Add the mattress height to the base or frame height to estimate the total step-up from the floor. Also check the pocket depth of fitted sheets and mattress protectors. A sheet designed for a shallow mattress may not sit securely on a 30cm profile.
Boxed delivery helps access, not room fit
A compressed mattress can be easier to move through a home before unboxing, but it still expands to its full finished dimensions. Carry the unopened box to the intended room first, clear the setup area and confirm the final mattress outline before opening.
Read the boxed mattress expansion and setup guide before delivery. Once the mattress is in use, the mattress care and rotation guide explains practical care habits.
Common mattress size questions
Are Australian and overseas mattress sizes the same?
No. Size names can refer to different dimensions in Australia, the United Kingdom, Europe and the United States. Check measurements in centimetres rather than assuming an imported frame, mattress or sheet will match by name.
Can a mattress be slightly smaller than its bed frame?
A small manufacturing tolerance may be normal, but a clearly mismatched mattress and frame can create movement, gaps or poor support. Follow the frame and mattress manufacturers' specifications and avoid forcing a mattress into an opening that is too small.
Which mattress size is best for a guest room?
It depends on the room and the guests you expect. A Single protects floor space, a Double offers more width for one sleeper and occasional flexibility, while a Queen provides more length and room for two when the bedroom can accommodate it. Tape the full bed footprint on the floor before deciding.
Which BOXY mattress sizes are available?
BOXY currently offers Single, Double, Queen and King sizes. Each is a 30cm hybrid mattress with memory foam comfort layers, pocket spring support and roll-packed delivery. Compare the range in the BOXY mattress collection.
Choose the size first, then compare comfort
Start with the room and frame measurements, shortlist the sizes that genuinely fit, and then compare construction, firmness and setup. The hybrid mattress buying guide explains the BOXY layer design and the questions to check before ordering.