Super King Mattress

A super king mattress is the largest standard size in Australia, a perfect square that gives couples true independence and families extra room on weekend mornings. Available in pocket spring, memory foam and hybrid constructions across every comfort feel, with a bed frame or base that must be specifically super king sized.

Room size and fit

A super king mattress measures 203cm wide x 203cm long, a perfect square and the largest standard mattress size in Australia, 20cm wider than a standard king (183cm x 203cm) and 50cm wider than a queen (153cm x 203cm). You'll want a bedroom of at least 16m², ideally 4m x 4m or more, with around 60cm of clearance on all accessible sides.

One important thing to know: super king bed sheets, protectors, and bed frames or bases must all be specifically super king sized. A standard king base (183cm x 203cm) will not support a super king mattress correctly, using the wrong base can void most warranties, and king accessories will not simply fit. We stock a range of super king bases and frames built for exactly this size.

Super king mattress design and materials

Understanding what is inside your mattress is worth the extra minutes to help you make your decision. Pocket spring mattresses use individually wrapped coils that move independently, delivering strong support, durability, and excellent motion isolation, which makes a real difference when you are sharing a bed. Memory foam super king mattresses respond to body heat and pressure to closely contour the body, excellent for pressure relief and side sleepers who want to wake up without a single aching joint. Hybrid super king mattresses layer pocket springs with foam or latex, giving you the responsive support of springs and the contouring comfort of foam in one. Latex is naturally breathable and responsive, a particularly good option for those who sleep warm and want to stay that way.

Who is a super king mattress best for?

Choosing a super king size mattress comes down to knowing what you want from your sleep, and once you make the switch, most people wonder why they waited so long. Here are the most common reasons people upgrade:

Couples who want true independence

A super king mattress for couples is less about sharing and more about having your own space within the same bed. At 203cm wide, each partner has roughly the equivalent of a king single to themselves, so a restless sleeper, a blanket thief, or someone who runs warm on one side simply stops being everyone's problem. Wake up refreshed, not resentful.

Families with young children or pets

Weekend mornings are a lot more enjoyable when there is actually room for everyone. A super king bed and mattress turns what used to be a chaotic, elbow-in-the-ribs situation into something genuinely comfortable. Plenty of space for the kids, the dog, and ideally, a coffee.

Premium sleepers who want the best

For buyers who treat sleep as a genuine health and lifestyle investment, super king is the logical endpoint. More surface area means more room to move through the night, less disturbance, deeper sleep, and mornings where you actually feel like yourself.

Super king mattress firmness guide

Super king mattresses at Forty Winks are available across a range of firmness levels. Our in-store team can confirm exactly what is available in super king sizes during your visit.

Ultra plush

The softest feel in the range, with deep cushioning comfort layers that cradle the body and take the pressure off completely. Best suited to side sleepers and lighter body types who want maximum give and that blissful, wrapped-in feeling from the moment they lie down.

Plush

All the support, with an extra layer of indulgence. A super king mattress plush option is perfect for side sleepers who love a gentle, contouring feel that cushions the body and eases pressure points, wrapping you in comfort so you wake up feeling relaxed and refreshed.

Medium

The crowd favourite for a reason. A super king mattress medium offers a balanced feel that suits a wide range of sleep styles, making it an easy choice for combination sleepers and couples with different preferences.

Firm

Firm is about enjoying a more stable, grounded sleep surface with less sink and more consistency throughout the night. A super king mattress firm option is ideal for back and stomach sleepers, as well as anyone who prefers a flatter feel and likes sleeping more on their mattress than in it.

Ultra firm

Maximum support, minimal give, and zero compromise. A super king mattress ultra firm offers an exceptionally stable sleep surface with minimal cushioning, delivering a consistent sleeping experience from edge to edge and night to night.

Budget and value

The cost of a super king mattress at Forty Winks ranges from $1,199 for entry-level models like Rest Assured Haven through to $6,999+ for premium options like the Crown Posture Bedding Physio Pro Advance. Most quality super king mattresses sit in the $2,299 to $6,599 range, typically 10 to 20 per cent more than the equivalent king model. Finance options are available to spread the cost.

Super king mattress brands at Forty Winks

At Forty Winks, we stock a carefully curated selection of super king mattresses from Australia's most trusted brands including King Koil, Sealy Posturepedic and Crown Posture Bedding. Every brand we carry has earned its place in the range, and because super king is a specialised size, our trusted in-store Sleep Advisors know exactly what is available and can help you compare, try and find the model that works best for your body and your budget.

Super king mattress care: Protecting your investment

A super king mattress is one of the most significant purchases you will make for your home. Looking after it properly makes a real difference to how long it performs and how good it feels years down the track.

• Super king mattress protector: Mattress protectors guard against spills, dust mites, and daily wear. This is an essential addition that also helps keep your mattress warranty valid.

• Super king bed base: Your bed base or frame must be specifically sized for a super king. Using the wrong base can affect performance and void most warranties.

• Regular rotation: Rotate fortnightly for the first three months, then seasonally after that, to help extend the life of your mattress.

Finding your super king mattress in store

A super king mattress is a serious investment in your sleep, and at Forty Winks we take that seriously too. As a proudly Australian, family-owned retailer with stores across the country and decades of sleep expertise behind us, we built Forty Winks bedMATCH^® exclusively for our customers because we believe getting it right matters more than making a quick sale.

This clinically proven sleep diagnostic system takes 18 precise body measurements and runs over 1,000 calculations to match you to the right super king mattress for your body type and sleep position. It works for couples too, taking both sleepers into account. Try your matched mattresses in store before you commit, and walk out knowing you have made the best decision for your sleep. Find your nearest Forty Winks store and get your Forty Winks bedMATCH^® today.