Australian mattress sizes differ from those in the US and UK — if you're buying a mattress online and not paying attention, it's surprisingly easy to order the wrong size, end up with bedding that doesn't fit, or discover that your new mattress doesn't match your existing bed frame. This guide covers all standard Australian mattress sizes, what each is best suited to, and the key things to check before buying.

Australian Mattress Size Chart

Here are the standard mattress dimensions used in Australia:

  • Single: 92cm x 188cm — suitable for children and single adults in smaller rooms
  • King Single: 107cm x 203cm — wider and longer than standard single, popular for growing children and teenagers
  • Queen: 153cm x 203cm — the most popular size in Australia; suits most couples
  • Super King: 203cm x 203cm — square format, uncommon; suits very large bedrooms

How Australian Sizes Compare to US and UK

This is important to know if you're buying from international brands or searching for information on international review sites:

  • Australian Queen (153 x 203cm) is wider than a US Queen (152 x 203cm) — virtually identical
  • Australian King (183 x 203cm) is narrower than a US King (193 x 203cm) but matches a US California King in width
  • UK King (150 x 200cm) is smaller than an Australian King

When buying bedding accessories — sheets, protectors, toppers — always check dimensions rather than relying on size names alone.

Single (92 x 188cm)

The standard single is the baseline mattress size. It's suitable for children from toddler age upward, and functional for single adults in smaller spaces. The 188cm length can be a limitation for taller adults. If a child is likely to stay in the bed into their later teenage years when they'll be taller, a king single may be a better long-term choice.

King Single (107 x 188cm)

The king single is the most practical upgrade from a single — it's 15cm wider but typically fits in the same bedroom space with the right bed frame. This extra width makes a significant comfort difference for growing children and teenagers. The standard length remains 203cm in most king single mattresses in Australia, though some brands use 188cm — check specifications carefully.

Double (138 x 188cm)

The double sits between king single and queen in width. It's used less commonly in Australia than the queen — for most couples, a queen provides substantially more space for only a moderate price increase. Doubles make sense as a budget option or in smaller bedrooms where a queen won't fit.

Queen (153 x 203cm)

The queen is Australia's most popular mattress size and the default recommendation for most couples. It provides adequate space for two adults, suits the standard Australian bedroom size, and is the size that most in-a-box brands default to in their pricing. If you're buying a mattress without a specific size constraint, a queen is almost always the right starting point.

King (183 x 203cm)

An Australian king mattress is 30cm wider than a queen. For couples, this additional space is often transformative — each person gains 15cm of personal space, which reduces disturbance from a partner moving during the night. The king requires a larger room — allow at least 380cm x 320cm for the room to accommodate the mattress with comfortable walkway space. The price premium for king over queen is typically $200–$500 depending on the brand.

Super King (203 x 203cm)

The super king is a square format at 203cm x 203cm. It's uncommon and typically reserved for very large master bedrooms. Standard bedding for super kings is more limited and more expensive. Most couples who want maximum space are better served by a regular king.

Which Size Do You Need?

  • Single bedroom, one adult: king single if the room allows, otherwise single
  • Child or teenager: king single is ideal; allows room to grow
  • Single adult in main bedroom: queen for comfort
  • Couple in standard bedroom: queen
  • Couple who values personal space or where one partner is restless: king
  • Very large master bedroom: king or super king

Matching Your Mattress to Your Bed Frame

Australian bed frame sizes correspond to standard mattress sizes. However, some older frames — particularly those bought second-hand or inherited — may have non-standard dimensions. Always measure your bed frame before ordering a mattress. For in-a-box mattresses, the delivery box can typically be brought into the room and the mattress unrolled onto the frame, so a bedroom door that's too narrow isn't a barrier.

Our Verdict

For most Australian couples, queen is the right starting point — and king is worth upgrading to if your bedroom allows it and you can stretch the budget. For children, king single is a smarter long-term choice than standard single. Always verify exact dimensions with the specific mattress brand before buying.

Expert Tips for Choosing Your Mattress Size

Beyond the basic dimensions, here are practical things to consider when sizing up:

  • Room proportions matter more than square metres. A queen fits comfortably in most Australian bedrooms, but narrow rooms may feel cramped. Measure your actual space and allow at least 60cm on either side of the bed for comfortable movement.
  • Partner sleep patterns are real. If one of you moves significantly during sleep or you have different temperature preferences, king size can be genuinely life-changing. The extra width reduces disturbance more than you might expect.
  • Kids grow fast. A king single at age 5 will still be suitable at 18. A standard single rarely is. The upfront cost difference is minimal compared to replacing it in five years.
  • Bedding availability and cost. Queen and king sheets are easy to find in Australia and reasonably priced. Anything smaller or larger carries a premium. Check current bedding costs for your intended size before committing.
  • Storage space under the bed. Smaller mattresses leave more usable floor space for storage drawers or boxes — a practical consideration in Australian homes where under-bed storage is common.

Common Mistakes to Avoid

  • Ordering based on US or UK naming conventions without checking actual centimetre dimensions.
  • Measuring only the mattress length without considering width — the width difference between sizes has a bigger impact on comfort than length.
  • Forgetting to factor in bed frame thickness when calculating total bed height, particularly relevant if you have mobility issues or share a bed with someone who does.
  • Assuming bedding will fit based on size name alone — always cross-reference with the specific mattress dimensions before buying sheets or doona covers.
  • Ignoring future needs. If you're single but planning to share your bed regularly, sizing up now saves hassle later.

Mattress Size FAQ

Can I use UK or US sheets on an Australian mattress?

Not reliably. Australian Queen (153 x 203cm) is slightly wider than US Queen, and Australian King (183 x 203cm) is narrower than US King. Sheets sized for US dimensions will either be too loose or too tight. Always buy bedding sized specifically for Australian mattresses.

What's the actual cost difference between sizes?

At quality brands like Koala, Sleeping Duck, and Emma, a queen typically ranges $800–$1,500 AUD, while a king costs $1,200–$2,000 AUD. The premium is usually 20–40% depending on the brand and model. Budget mattresses show a smaller percentage gap; premium mattresses a larger one.

Will a queen mattress fit through my bedroom door?

Most in-a-box mattresses (Koala, Emma, Ergoflex) arrive vacuum-sealed and compressed in a box roughly 1m x 0.5m x 0.5m. You can carry this through any standard door. Traditional mattresses are delivered flat and may require removal of the door or tilting. Always ask about delivery logistics when ordering.

Is a king mattress worth the extra cost for couples?

It depends on your budget and how you sleep. If one partner is significantly larger, restless, or you have a pet in the bed, king is usually transformative and worth it. If both partners are small and sleep still, a queen is adequate. Test both sizes in-store if possible.

Can I use a queen frame with a king mattress?

No. A king mattress (183cm wide) will overhang a queen frame (153cm wide) and lack support, leading to sagging and potential damage. Always match the frame size to the mattress size exactly.

Should I buy a mattress protector in a specific size?

Yes. Mattress protectors are sized to fit specific mattress dimensions. A queen protector won't fit a king properly. Check the product specifications and match them to your exact mattress size.

Mattress Size Buying Checklist

  • ☐ Measure your bedroom length and width in centimetres
  • ☐ Calculate available space allowing 60cm clearance on two sides
  • ☐ Measure your existing bed frame (length × width × height)
  • ☐ Check your bedroom door width and nearest turning angles for delivery
  • ☐ Confirm your partner's comfort needs and sleep patterns
  • ☐ Research exact mattress dimensions for the brand you're considering (not just the size name)
  • ☐ Check availability and cost of sheets and doona covers in your chosen size
  • ☐ Review the brand's delivery and setup process
  • ☐ Confirm return policies in case the size doesn't work out
  • ☐ Factor in future needs (growing kids, sharing your bed, mobility changes)

Final Verdict

Australian mattress sizing is straightforward once you know the standard dimensions — but the differences between US and international sizes create real pitfalls for online buyers. Measure twice, order once. For most Australian households, queen is the sensible default; king is worth considering if your room and budget allow. For children and teenagers, king single offers genuine long-term value. Verify exact dimensions with the manufacturer, not just the size name, and always check that your bedding matches your mattress specifications.

Frequently Asked Questions

How do I know if a mattress is right for me?▾
The best indicator is how you feel after sleeping on it for 3–4 weeks. Most reputable Australian brands offer 100–120 night trials specifically so you can assess this at home. Your body typically takes 2–3 weeks to adjust to a new mattress.
What mattress trial period should I look for?▾
Look for at least 100 nights — this gives your body enough time to adjust and you enough time to assess the mattress across different conditions. All of our recommended Australian brands offer 100 nights minimum.
Are mattress-in-a-box brands good quality?▾
Yes — brands like Koala, Emma, and Ecosa offer genuine quality comparable to traditional retail mattresses at better prices, because they sell direct without retail markup. The free trial period means you can test at home with no risk.