The standard dimensions of king size mattress in Australia are approximately 183 cm wide × 203 cm long. Some manufacturers specify the width as 183.5 cm, so it is always worth checking the exact mattress specifications before purchasing a bed frame, fitted sheet or other bedding.
In millimetres, the commonly quoted dimensions are 1,830 × 2,030 mm. In imperial measurements, this is approximately 72 × 80 inches.
An Australian King mattress is 30 cm wider than a standard Queen mattress, while both are generally 203 cm long. A Super King is wider again, measuring approximately 203 × 203 cm.
The main reason Australians choose a King mattress is the generous width.
At approximately 183 cm wide, a King provides considerably more personal sleeping space than a Queen while retaining the same approximate 203 cm length. This makes it particularly appealing to couples who want additional room to move during the night.
A King can also be useful for households where children or pets occasionally share the bed.
The additional width does, however, require careful bedroom planning. The mattress itself occupies more than 3.7 square metres, before allowing for the bed frame, bedside tables and walking space.
The standard Australian King mattress width is approximately 183 cm.
Some manufacturers quote 183.5 cm, so small differences between brands are possible.
A standard Australian King mattress is approximately 203 cm long.
This makes it 15 cm longer than an Australian Double and the same general length as Queen, King Single and Super King mattresses.
Unlike width and length, mattress thickness is not standardised to one fixed measurement.
Depending on construction, a King mattress might be relatively low-profile or considerably deeper. Pillow-top, plush, hybrid and premium mattresses can all have different heights.
This matters when selecting fitted sheets and bed frames.
| Mattress Size | Approximate Dimensions |
|---|---|
| Single | 92 × 188 cm |
| King Single | 107 × 203 cm |
| Double | 138 × 188 cm |
| Queen | 153 × 203 cm |
| King | 183 × 203 cm |
| Super King | 203 × 203 cm |
The exact dimensions can vary slightly between manufacturers, so these measurements should be treated as a useful Australian sizing guide rather than a substitute for the product specifications.
A Queen mattress is approximately 153 × 203 cm, while a King is approximately 183 × 203 cm.
The main difference is width.
A King provides around 30 cm of additional width, giving couples noticeably more room to spread out.
Both sizes are approximately the same length, so upgrading from Queen to King primarily changes the amount of side-to-side sleeping space.
An Australian Super King mattress is approximately 203 × 203 cm.
Compared with a standard King, the Super King adds around 20 cm of width while retaining the same 203 cm length.
This makes Super King particularly appealing in large master bedrooms where generous proportions are important.
Before choosing one, however, consider the complete footprint of the bed frame and the amount of circulation space available around it.
One of the most important points about the dimensions of king size mattress is that the mattress measurement is not the same as the external measurement of the bed.
A King mattress may measure approximately 183 × 203 cm, but the completed bed can be wider or longer because of:
Always check the external dimensions of the bed frame, rather than assuming it will occupy exactly 183 × 203 cm.
A King mattress itself is approximately 183 × 203 cm, but comfortable bedroom planning requires additional space around it.
Allow room for:
A room can physically accommodate a King mattress but still feel cramped once the frame and other furniture are introduced.
For a polished interior, the goal is not simply to make the bed fit. It should have enough breathing room to feel proportionate.
The additional width makes a King especially comfortable for couples.
The larger sleeping surface provides more room when children occasionally climb into bed.
The generous dimensions create a strong focal point in a spacious main bedroom.
A King mattress can give a bedroom a more substantial, hotel-inspired appearance.
Extra width can be helpful for people who move frequently during sleep.
A King mattress works beautifully with layered quilts, doonas, blankets, throws and decorative cushions.
Some King configurations use two separate bases beneath one overall King mattress size, which can make handling and movement easier.
When shopping around the dimensions of king size mattress, begin with the mattress measurement and then consider the complete bedroom.
A King bed works beautifully as the centrepiece of a spacious bedroom, particularly when paired with a substantial bedhead, coordinated bedside tables and layered bedding.
For a sophisticated Australian interior, consider natural textures, warm neutrals and carefully proportioned accessories. A generous quilt or doona, textured throw and a selection of cushions can soften the scale of a King bed without making it feel overcrowded.
House of Isabella Australia offers distinctive homewares and furniture, a large in-stock catalogue, fast delivery Australia-wide, East and West Coast warehouses and Australian-based customer care.
Buy Now, Pay Later options including Afterpay and Zip can also make larger bedroom updates easier to plan.
Collections such as Florabelle Collection, Zaffero, Emac & Lawton, Gallery Home, Café Lighting & Living and OneWorld Collection can provide contextual inspiration when coordinating bedside furniture, lighting and decorative pieces.
King beds provide plenty of space for layered bedding, creating the relaxed luxury associated with boutique hotels.
Cream, oatmeal, beige, taupe, warm white and earthy shades continue to create calm bedroom environments.
Large upholstered and timber bedheads can balance the generous width of a King mattress and create a strong visual focal point.
Linen-look fabrics, timber, woven details and tactile throws add warmth without overwhelming the room.
Rounded bedside tables, curved bedheads and organic accessories can soften the strong rectangular proportions of a King bed.
Storage beds are increasingly useful for keeping spare bedding and seasonal items organised without requiring additional furniture.
Layered bedding, symmetrical bedside tables, statement lighting and restrained decorative accessories create a polished bedroom atmosphere.
Position the bed so the room feels balanced rather than simply pushing it against the largest available wall.
A King bed can make very small bedside tables look visually lost. Choose pieces that feel appropriately substantial without obstructing movement.
Begin with fitted bedding, add a King-sized quilt or doona, then introduce a coverlet, blanket or throw for additional texture.
A few larger cushions can create depth, while too many can make the bed difficult to use.
A wide upholstered or timber bedhead can reinforce the scale of the King mattress and create a sophisticated focal point.
Matching bedside lamps create symmetry, while sculptural pendant lights or wall-mounted lighting can provide a more contemporary approach.
This distinction is particularly important when planning a bedroom.
Mattress dimensions describe the sleeping surface itself.
Bed frame dimensions describe the complete external footprint of the furniture.
For example, a King mattress may be approximately 183 × 203 cm, while the finished bed frame could be larger depending on its construction.
If you are working with a tight room, always measure the complete bed rather than relying only on the mattress size.
A standard Australian King mattress is approximately 183 × 203 cm, although some manufacturers specify approximately 183.5 × 203 cm.
An Australian King is approximately 72 × 80 inches.
No. An Australian King is approximately 183 × 203 cm, while a US King is wider at approximately 193 × 203 cm.
Yes. An Australian King is approximately 30 cm wider than a Queen, while both are generally around 203 cm long.
An Australian Super King is approximately 203 × 203 cm, making it around 20 cm wider than a standard King.
Not necessarily. Width and length are generally standardised, but mattress depth can vary considerably. Always check the fitted sheet's depth and the mattress manufacturer's specifications.
Understanding the dimensions of king size mattress makes planning a bedroom much easier.
For most Australian homes, the key measurement to remember is approximately 183 × 203 cm. However, always check the exact manufacturer's dimensions, particularly when buying a bed frame, fitted sheets or mattress accessories.
A King mattress offers generous sleeping space and can become an impressive centrepiece in a well-proportioned bedroom. Give it enough surrounding space, balance its scale with substantial furniture and finish the look with layered, tactile bedding.
The result is a bedroom that feels spacious, comfortable and beautifully considered.
Brand and collection names mentioned in this glossary are included purely for descriptive and contextual purposes. House of Isabella Australia is not affiliated with, endorsed by, or associated with the brands mentioned, and all trademarks remain the property of their respective owners.
Disclaimer: All trademarks, brand names and product names mentioned on this website are the property of their respective owners. Any references are made for identification, informational or comparative purposes only, and do not imply any affiliation, endorsement, sponsorship or authorisation.
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