Australian Bed Size Guide for Mattresses, Bed Frames & Bedding

Choosing a new mattress in Australia can feel confusing when the same bed has different measurements listed in centimetres, millimetres and inches. This guide walks you through every standard Australian mattress size, explains who each one suits, and clears up the difference between a mattress, its bed frame and the bedding that goes on top. By the end, you'll know exactly which size fits your room and your sleeping needs.

Australia uses seven common mattress sizes, from a compact single through to a spacious super king. The table below compares each mattress in centimetres, millimetres and inches, along with a quick note on who it typically suits.

Here's a closer look at each mattress, with dimensions and who it tends to suit.

Single Bed Dimensions

• Centimetres: 92 × 188

• Milimetres: 920 × 1880

• Inches: 36 × 74

A single is the most compact standard mattress. It's a practical choice for children's rooms, bunk beds and tight spaces where floor area matters.

Best for: kids, solo sleepers and smaller bedrooms. Explore our single mattresses.

King Single Bed Dimensions

• Centimetres: 107 × 203

• Milimetres: 1070 × 2030

• Inches: 42 × 80

A king single adds both width and length over a standard single, giving taller sleepers extra room to stretch out.

Best for: growing teens, taller individuals and guest rooms. See the king and long single range.

Double Bed Dimensions

• Centimetres: 137 × 188

• Milimetres: 1370 × 1880

• Inches: 54 × 74

A double gives one person plenty of space to spread out. Two adults can share it, though the width is snug compared with a queen.

Best for: solo sleepers wanting more room, or couples in compact rooms. Browse our double mattresses.

Queen Bed Dimensions

• Centimetres: 153 × 203

• Milimetres: 1530 × 2030

• Inches: 60 × 80

The queen is the most widely chosen mattress in Australian homes. It balances comfortable width for two with a footprint that fits most main bedrooms.

Best for: couples and anyone wanting a roomy solo bed. Take a look at our queen mattresses.

King Bed Dimensions

• Centimetres: 183 × 203

• Milimetres: 1830 × 2030

• Inches: 72 × 80

A king offers noticeably more width than a queen, which helps couples who move around at night or share the bed with children or pets.

Best for: couples wanting generous personal space.

Super King Bed Dimensions

• Centimetres: 203 × 203

• Milimetres: 2030 × 2030

• inches: 80 × 80

The super king is the largest standard mattress, forming a near-square shape. It needs a large bedroom to fit comfortably with walking room around it.

Best for: couples with oversized, spacious rooms. View our king and super king mattresses.

Here's a common surprise: a bed frame is always slightly larger than the mattress it holds. The dimensions listed above measure the mattress only. Once you add a frame, the external footprint grows because of side rails, headboards, footboards and any surrounding trim.

The extra width and length varies by design. A slim, low-profile frame adds only a few centimetres, while a frame with a padded headboard or storage drawers can add considerably more. Before you buy, measure the outer dimensions of the bed frame, not just the mattress size. The same applies to bed bases, which usually match the mattress footprint but can sit inside a frame that extends further.

The key idea: shop for the mattress size you want, then confirm the frame's total footprint will fit your room.

Bedding is sized to match standard mattress dimensions, so a queen fitted sheet is made for a queen mattress. Simple enough, but two details are worth checking.

• Mattress depth matters. Fitted sheets are made to fit a range of mattress depths. A thicker mattress or an added topper may need deep-fitted sheets so the corners stay in place.

• Doonas often run larger. A quilt or doona is usually wider than the mattress so it drapes over the sides. Many people size up their doona a step for better coverage.

When in doubt, match your bedding to your mattress size first, then adjust for depth and drape.

A mattress that fits the frame still needs room to move around. Follow these steps before you buy:

1. Measure the floor space. Note the length and width of the room in centimetres.

2. Mark the bed's footprint. Use the frame's external dimensions, not the mattress size alone.

3. Leave walking room. Aim for around 60–70 cm of clear space on the sides and foot of the bed so you can move and make it easily.

4. Check doorways and hallways. Confirm the mattress and frame can physically get into the room.

5. Account for other furniture. Allow space for wardrobes, drawers or bedside tables to open freely.

If the room feels tight, dropping down one size, from a king to a queen for example, often creates a more comfortable layout.

Frequently Asked Questions

Now that you know how each mattress size compares, measure your room, confirm the frame footprint and match your bedding to suit. When you're ready, browse the full range at Sleeping Giant to find the size that fits your space.