An Australian double mattress measures 138 cm wide and 188 cm long (1,380 × 1,880 mm). It's a practical choice for single adults, teenagers and guest bedrooms, offering more sleeping space than a single or king single mattress. However, couples may find a queen more comfortable, especially if they prefer extra room to move.
If you're wondering what size a double bed mattress is in Australia, this guide covers the exact dimensions, comparisons with other mattress sizes, bedroom space requirements, bed frame compatibility and what to check before buying.
What Size Is a Double Mattress in Australia?
The standard Australian double mattress size is 138 × 188 cm (width × length), approximately 54.3 × 74 inches.
These measurements refer to the mattress itself, not the outer dimensions of the bed frame. Mattress thickness also varies depending on the brand and model.
Here are the standard measurements:
- Width: 138 cm (1,380 mm)
- Length: 188 cm (1,880 mm)
- Dimensions in inches: Approximately 54.3 × 74 inches
- Sleeping width for two people: Approximately 69 cm each
- Mattress thickness: Varies by model
Australian mattress retailers commonly use these dimensions, although imported products and individual manufacturers may differ.
For an independent reference, see Bedbuyer's Australian mattress size guide.
If you want to compare every standard mattress size, including single, king single, queen, king and super king, see DuuDuu's Australian Bed Size Guide and Dimensions Chart.
Australian Bed Mattress Size Comparison: Double vs King Single vs Queen
Choosing the correct mattress size involves more than measuring its width. Mattress length, available bedroom space and the number of people sharing the bed are equally important.
The following table compares the three most relevant Australian mattress sizes when considering a double bed.
|
Mattress Size |
Dimensions (cm) |
Dimensions (in inches) |
Best For |
|
King Single |
107 × 203 cm |
42.1 × 79.9 in |
Taller solo sleepers who need extra length |
|
Double |
138 × 188 cm |
54.3 × 74.0 in |
Solo adults, teenagers and compact guest rooms |
|
Queen |
153 × 203 cm |
60.2 × 79.9 in |
Couples wanting more width and length |
Double vs Queen Mattress: What's the Difference?
An Australian queen mattress measures 153 × 203 cm, making it 15 cm wider and 15 cm longer than a double.
This difference can be important for couples and taller sleepers.
A double mattress provides approximately 69 cm of sleeping width per person when shared equally. A queen offers around 76.5 cm per person.
Although the difference may appear small, extra width can make sharing a bed more comfortable when one or both sleepers regularly change positions.
A double may be suitable if you have a smaller bedroom or only occasionally share the bed. A queen is worth considering if two adults sleep together every night.
Double vs King Single Mattress: Which Is Better?
A king single mattress measures 107 × 203 cm, making it 31 cm narrower but 15 cm longer than a double.
A king single may be the better choice for a taller person sleeping alone, particularly when bedroom width is limited.
A double provides more room to move from side to side, making it appealing for teenagers, solo adults and guest bedrooms.
The main difference is simple: Choose a king single if extra length matters most, or a double if you prefer additional width.
Is a Double Mattress Big Enough for Two Adults?
Yes, two adults can sleep on a double mattress, but it provides less personal space than a queen.
With a standard width of 138 cm, each person has approximately 69 cm of space if the bed is shared equally.
Whether that is comfortable depends on individual body size, sleeping positions and personal preferences.
A double mattress may suit:
- Single adults who enjoy additional sleeping space.
- Couples who prefer sleeping close together.
- Teenagers transitioning to a larger bed.
- Guest bedrooms with occasional overnight visitors.
- Smaller bedrooms where a queen would take up too much space.
For couples who frequently change sleeping positions or prefer more personal room, a queen may be worth the additional floor space.
Is a Double Mattress Suitable for Tall People?
A standard Australian double mattress is 188 cm long.
For someone approximately 183 cm tall (six feet), that leaves only around 5 cm of spare mattress length.
Pillow placement, sleeping position and personal comfort can make that feel restrictive.
A queen or king single, both commonly 203 cm long, provides an additional 15 cm of length and may be more suitable for taller sleepers.
Will a Double Mattress Fit in a Small Bedroom?
A double mattress can work well in a smaller bedroom, but you should measure the complete bed frame and available walking space before buying.
The standard mattress footprint is 138 cm wide and 188 cm long.
However, bed frames with upholstered sides, headboards or storage features can extend beyond those measurements.
Will a Double Bed Fit in a 3 × 3 Metre Room?
A double mattress can physically fit inside a 3 × 3 metre room, but that does not automatically mean the layout will be practical.
Consider a room measuring 300 × 300 cm.
|
Measurement |
Available Space |
|
Room width |
300 cm |
|
Double mattress width |
138 cm |
|
Remaining total width |
162 cm |
|
Room length |
300 cm |
|
Double mattress length |
188 cm |
|
Remaining total length |
112 cm |
These calculations describe the mattress footprint only. The remaining space is not necessarily available as a clear walkway because bed-frame dimensions, room layout and other furniture must also be considered.
How to Measure Your Bedroom Before Buying
- Measure the room: Record the available length and width, including fixed features.
- Check the bed frame: Find its external measurements rather than relying only on the mattress size.
- Allow access around the bed: Consider walking space, bedside tables and wardrobes.
- Check doors and drawers: Make sure they can open without hitting the bed.
- Confirm delivery access: Measure narrow doorways, corridors, stairs and lifts if necessary.
A little planning can help prevent buying a mattress or bed frame that technically fits but makes the bedroom difficult to use.
Will an Australian Double Mattress Fit Any Double Bed Frame?
Not necessarily. While Australian double bed frames are generally designed for mattresses measuring 138 × 188 cm, frame construction and imported sizing can differ.
Always check the manufacturer's recommended mattress dimensions.
For example, a frame may include thick upholstered rails or a large headboard, increasing the overall space it occupies.
Also check whether the mattress requires a particular type of base, slat spacing or support system.
Are Australian and European Double Mattress Sizes the Same?
Not always.
Mattress sizes differ between countries, and a bed frame described as a double overseas may not match Australian measurements.
This is particularly important when purchasing imported furniture or bedding online.
If you're comparing international dimensions, read DuuDuu's Australian vs European Mattress Sizes Guide before ordering.
Buying tip: Always compare actual centimetre measurements instead of relying only on labels such as double, full or standard.
What Thickness Should a Double Mattress Be?
Mattress size and mattress thickness are two separate measurements.
A double mattress measures 138 × 188 cm across its sleeping surface, but its height depends on the construction and materials.
Mattresses may contain different combinations of foam, latex, springs, comfort layers and covers.
For example, the DuuDuu Hybrid Mattress is listed with double-size dimensions of 138 × 188 × 30 cm (width × length × height).
A thicker mattress is not automatically better than a thinner one. Comfort, support and durability depend on the overall design, materials and how well the mattress suits the sleeper.
When comparing products, check the complete specifications rather than relying on thickness alone.
What Size Sheets Fit an Australian Double Mattress?
Australian double fitted sheets are generally designed for mattresses measuring 138 × 188 cm.
However, you must also check the mattress depth.
A fitted sheet with insufficient pocket depth may be difficult to fit or could slip off the mattress.
For example, DuuDuu's TENCEL™ bed sheets have been listed in double size with measurements of 138 × 188 cm and a 43 cm fitted-sheet pocket depth.
Before buying sheets, check:
- The mattress width and length.
- The mattress thickness.
- Whether you use a mattress topper.
- The fitted sheet's stated pocket depth.
- Any manufacturer-specific sizing instructions.
Remember that fitted sheets, flat sheets and doona covers have different sizing requirements.
How to Choose the Right Double Mattress in Australia
Once you've confirmed the dimensions, the next step is choosing a mattress that suits your sleeping preferences, bed frame and budget.
1. Consider Who Will Sleep on It
A double mattress can be a practical everyday choice for a solo adult.
For couples, consider whether 69 cm of space per person provides enough room.
For taller sleepers, compare the double's 188 cm length with the 203 cm length of a queen or king single.
2. Check Mattress Construction
Mattresses use different combinations of springs, foam, latex and comfort layers.
Consider factors such as support, firmness preference, edge feel, ventilation and movement across the mattress.
Avoid assuming that one material or construction type is automatically best for every person.
3. Choose a Firmness That Feels Comfortable
Firmness preferences vary according to body size, sleeping position and individual comfort.
A mattress described as medium-firm by one manufacturer may feel different from another mattress carrying the same label.
Where possible, review the manufacturer's firmness description and any applicable trial conditions.
4. Confirm Bed Frame Compatibility
Check that the frame supports the mattress dimensions, weight and construction.
If you're keeping an existing bed frame, inspect its condition and follow the mattress manufacturer's base requirements.
5. Review Bedding Compatibility
Consider whether your existing fitted sheets, mattress protector and other bedding will fit the new mattress depth.
This is especially important when replacing a thinner mattress with a deeper hybrid model.
6. Compare Product Details Before Ordering
Review the available sizes, materials, warranty information, delivery conditions, current price and stock availability.
If you're considering a hybrid design, the DuuDuu Hybrid Mattress is one option to compare in Australian double size.
Always check the current product listing for the exact measurements and purchasing conditions.
Frequently Asked Questions About Double Mattress Sizes
What is the standard size of a double mattress in Australia?
A standard Australian double mattress measures 138 cm wide by 188 cm long. That is equivalent to 1,380 × 1,880 mm, or approximately 54.3 × 74 inches. Mattress thickness varies by model.
How wide is a double bed in cm?
An Australian double mattress is 138 cm wide. The complete bed frame may be wider because of upholstered sides, structural rails or headboard design.
How long is an Australian double mattress?
An Australian double mattress is 188 cm long. Queen and king single mattresses are commonly 203 cm long, providing an additional 15 cm of length.
Is a double bed big enough for two adults?
Yes, but it provides approximately 69 cm of sleeping width per person. Couples who prefer more personal space may find a queen more comfortable.
What is the difference between a double and queen mattress in Australia?
A queen mattress is 15 cm wider and 15 cm longer than a double. Double mattresses measure 138 × 188 cm, while queen mattresses measure 153 × 203 cm.
Is a king single bigger than a double?
A king single is longer but narrower than a double. It measures 107 × 203 cm compared with 138 × 188 cm for a double, making it a useful option for taller solo sleepers.
Will a double mattress fit in a 3 × 3 metre bedroom?
A double mattress can fit in a 3 × 3 metre bedroom, but the complete layout determines whether it is practical. Check the bed frame's external dimensions, walking space and furniture clearance.
What size fitted sheets do I need for a double mattress?
Choose Australian double fitted sheets designed for a 138 × 188 cm mattress. Check the pocket depth against your mattress thickness and any topper to ensure a proper fit.
Find the Right Double Mattress for Your Bedroom
An Australian double mattress measures 138 × 188 cm, making it a practical option for solo adults, teenagers and guest bedrooms.
Before buying, compare the available sleeping space, your height, bedroom dimensions, bed-frame compatibility and fitted-sheet requirements.
If you regularly share your bed or need more length, a queen may be a better option. If you're a taller solo sleeper with limited space, a king single is also worth considering.
To compare Australian-sized mattresses and bedding, visit DuuDuu Australia and choose a size that suits your space, sleeping preferences and everyday needs.
