Mattress Sizes in Australia Explained: Dimensions, Differences, and How to Choose

One of the most common questions people have when buying a mattress is which size to choose. The answer depends on your bedroom dimensions, who is sleeping on the mattress, and how much space you want to feel comfortable.

This guide covers every standard mattress size available in Australia, with exact dimensions, practical comparisons, and advice on which size suits different situations.

Standard Australian Mattress Sizes

Australian mattress sizes follow a consistent standard, though minor variations can occur between manufacturers. The sizes below represent standard Australian dimensions.

• Single: 91 cm wide by 188 cm long. The smallest standard size, suited to children, compact bedrooms, and single adults in tight spaces.
• King Single: 107 cm wide by 203 cm long. Sixteen centimetres wider and fifteen centimetres longer than a standard single. A practical upgrade for teenagers, taller adults, and guest rooms.
• Double: 138 cm wide by 188 cm long. Sometimes called a full size. Suits solo sleepers who want more room and couples in smaller bedrooms. Note that the double is shorter than the king single and queen.
• Queen: 153 cm wide by 203 cm long. Australia's most popular mattress size. Comfortably fits two adults and suits most standard master bedrooms.
• King: 183 cm wide by 203 cm long. Thirty centimetres wider than a queen. The best choice for couples who want maximum sleeping space.
• Super King: 203 cm wide by 203 cm long. A square mattress that offers the most sleeping space of any standard size. Requires a larger bedroom and specialist bed frames and linen.

How Australian Sizes Compare to US and UK Sizes

If you are shopping from international retailers or using overseas size references, it is important to know that mattress sizes are not universal.

The US queen (152 x 203 cm) is almost identical to the Australian queen (153 x 203 cm), but the US king (193 x 203 cm) is ten centimetres wider than the Australian king (183 x 203 cm). UK sizes differ more significantly. The UK king (150 x 200 cm) is closer in width to an Australian queen, and the UK super king (180 x 200 cm) is similar to an Australian king but three centimetres shorter.

When buying mattresses, bed frames, or linen from international sources, always confirm the dimensions against Australian standards before purchasing.

Which Size is Right for Your Bedroom?

As a general rule, leave at least 60 cm of walking space around the sides and foot of a bed so the room feels functional and not cramped.

For a single mattress, a room of at least 2.5m x 3m is comfortable. For a king single, aim for 2.8m x 3m or larger. A double fits well in rooms from 3m x 3m upward. A queen suits rooms of 3.5m x 3.5m or larger, while a king is best in rooms of 4m x 4m and above.

These are guides rather than strict rules. In practice, bedroom layout, door placement, and wardrobe positions all affect how much usable floor space you have around the bed.

Single vs King Single: Which Should You Choose?

The king single is consistently better value for most situations where a single might seem like the obvious choice. For a teenager, the extra width and length of a king single accommodates growth and provides a more comfortable sleep surface. For a guest room, the king single fits almost the same footprint but sleeps taller guests without their feet hanging off the end.

The only situation where a single clearly makes more sense is when the available room or bed frame space genuinely does not allow for the king single dimensions.

Double vs Queen: The Most Common Dilemma

The double is fifteen centimetres narrower and fifteen centimetres shorter than a queen. For couples, that size difference is significant. On a double, each person has about 69 cm of sleeping width. On a queen, that increases to approximately 76.5 cm each.

For solo sleepers, either size is comfortable. For couples, the queen is almost always the better choice if the room allows. The double works well in smaller master bedrooms or guest rooms that occasionally need to fit two people.

It is also worth noting that the double is shorter than the queen (188 cm vs 203 cm), which can be a real consideration for anyone over 180 cm tall.

Queen vs King: Is the Extra Width Worth It?

Going from a queen to a king adds thirty centimetres of total width, which works out to fifteen centimetres per person for a couple. In practice, this is a meaningful amount of space, particularly for partners who move around a lot during the night.

The king is well suited to couples who share the bed with children or pets, taller sleepers, and anyone who wants their bedroom to feel like a proper master suite. The main trade-off is that it requires a larger room and typically costs more, both for the mattress and for the bed frame and linen.

Also Read: Queen vs King Mattress: Which One is Right for You?

Does Bed Frame Size Always Match Mattress Size?

Yes. Bed frames and bases are designed to match standard mattress sizes exactly. A queen mattress requires a queen frame, a king requires a king frame, and so on. You cannot put a larger mattress on a smaller frame and expect it to work correctly.

When upgrading your mattress size, you will need to upgrade your base and frame at the same time. Linen, including fitted sheets and mattress protectors, is also size-specific.

At Chiro Care Mattresses, we stock bed frames across all standard Australian sizes alongside our mattress range, so you can find a matching setup in the one place.