Australian Mattress Sizes Explained

A simple guide to common Australian mattress sizes, approximate dimensions, room planning and choosing the right size for your sleep setup.

Single, queen, king or something in between? The right mattress size needs to work for both the sleeper and the room. This guide compares common Australian mattress sizes and the practical things to consider before choosing.

Common Australian mattress sizes

Mattress dimensions can vary slightly between brands, ranges and retailers, so always confirm the exact product size before buying a mattress, base, bed frame or linen. As a general guide, common Australian sizes are often close to the dimensions below.

Single mattress

Common size: approximately 92 cm x 188 cm.

A single mattress is often used for children, smaller bedrooms, bunk beds and compact guest rooms. It is the most space-efficient standard size, but it may feel narrow for taller adults or people who move around during sleep.

Long single mattress

Common size: approximately 92 cm x 203 cm.

A long single offers the width of a single with extra length. It can be useful for taller children, teenagers, guest rooms or compact spaces where a king single may feel too wide.

King single mattress

Common size: approximately 107 cm x 203 cm.

A king single offers extra length and width compared with a single. It can be a good option for growing children, teenagers, single adults or guest rooms where a double mattress would feel too large.

Double mattress

Common size: approximately 138 cm x 188 cm.

A double gives one person more room to spread out and can work well in compact bedrooms or guest rooms. Two people can share a double, but the available space is more limited than on a queen or king.

Queen mattress

Common size: approximately 153 cm x 203 cm.

A queen mattress provides more width than a double while remaining practical for many main bedrooms and larger guest rooms.

King mattress

Common size: approximately 183 cm x 203 cm.

A king mattress gives couples more width than a queen. It can be helpful for people who move during sleep, couples with different sleeping positions, or anyone who simply wants more personal space.

Before choosing a king, measure the room carefully to make sure there is still enough space for bedside tables, drawers and walkways.

Super king mattress

Common size: approximately 203 cm x 203 cm.

A super king offers a very generous sleep surface. It can suit larger bedrooms, families with young children who climb into bed, or couples who want maximum space.

Because it takes up more floor area, it needs a room that can comfortably handle the size without feeling crowded.

Measure the room, not just the bed

Before choosing a mattress size, measure the full room. Allow space for bedside tables, wardrobes, drawers, doors and walkways around the bed.

A good rule of thumb is to leave enough room to walk comfortably around the sides and end of the bed. If the mattress makes the room feel cramped, a slightly smaller size may be the better long-term choice.

“A larger mattress only works if the room still has enough space to function comfortably.”

Consider the full bed footprint

The mattress size also affects the base, bedhead and linen you need. Some bed frames and bases can add extra width or length beyond the mattress dimensions.

If you are working with a tight room, check the overall footprint of the full bed setup, not just the mattress. A tall bedhead, thick base or wide frame can change how the room feels.

Explore Crown Posture Bedding bedheads and bases when planning the complete footprint of your bed.

Think about future needs

A mattress is a long-term purchase, so think about whether your needs are likely to change over its life. A growing child may need more length or width over time, while couples may decide they want more personal space. A guest room may also need flexibility for different visitors.

Choosing the right size now can make the bedroom more comfortable and practical over time.

If you share the bed, our guide to choosing a mattress as a couple can help you think through space, movement and comfort together.

You can also explore the Crown Posture Bedding mattress ranges before visiting a retailer.

Choose a size that works for your space

Visit your nearest Crown Posture Bedding retailer to compare mattress sizes and see which options suit your room and sleep setup.

To see these sizes in an everyday range, explore the Royale and Essential range.