Last updated: March 2025 · 8 min read · Expert reviewed
Everything you need to know about Australia's two largest standard mattress sizes — dimensions, room requirements, prices, and who each size suits best.
Choosing between a king and a super king mattress is one of the most important decisions you'll make for your bedroom — and it's not as simple as "bigger is better." The right size depends on your room's dimensions, who you share your bed with, your sleep style, and your budget.
As Queensland's trusted furniture specialists with 5 stores across Brisbane, Ipswich, and the Gold Coast, the A2Z Furniture team helps hundreds of Aussie families make this decision every month. This guide covers everything you need to know — written by our in-store sleep experts and backed by Australian sizing standards.
Australian Note: The "Super King" is Australia's equivalent to what the United States calls a "California King" — though the dimensions differ. Australian sizes are unique, so always verify measurements in centimetres before purchasing bedding or bed frames online from overseas retailers.
1. Australian Size Dimensions & Visual Comparison
Before comparing features, let's get the numbers straight. Both sizes share the same length, but the super king offers a meaningful 20cm of extra width.
| Feature | King (183 × 203cm) | Super King (203 × 203cm) |
|---|---|---|
| Width | 183 cm (1,830 mm) | 203 cm (2,030 mm) |
| Length | 203 cm (2,030 mm) | 203 cm (2,030 mm) |
| Space per sleeper (couple) | ~91.5 cm each | ~101.5 cm each |
| Min. recommended room size | 3.6m × 3.6m | 4.2m × 4.2m |
| Suits average bedroom | ✓ Yes | Needs larger room |
| Standard bedding availability | ✓ Wide range | Moderate (growing) |
| Typical price range (mattress only) | $400 – $3,500+ | $600 – $4,500+ |
| Two long singles = one? | ✓ Yes (split king option) | No |
* Dimensions may vary ±15mm between brands due to manufacturing tolerances. Always measure before purchasing bedding.
2. Room Size Requirements
The single biggest factor in deciding between a king and super king is your bedroom's dimensions. Sleep experts and furniture retailers recommend a minimum of 60–75cm of clearance around all accessible sides of the bed to allow comfortable movement, open drawers on bedside tables, and maintain a spacious feel.
Allows 75cm clearance on both sides. Suits most standard master bedrooms in QLD homes.
Allows 75cm clearance on both sides. Ideal for larger master suites in new builds and renovated homes.
How to Measure Your Room
Before visiting a store, take these four steps:
- Measure your bedroom wall-to-wall (both width and length).
- Mark out the mattress footprint on the floor using masking tape.
- Check clearance from the bed edge to the wall, wardrobe, and doorway.
- Confirm there's at least 60cm from the foot of the bed to any wall or dresser.
QLD Homes Tip: Standard Queensland master bedrooms typically measure 3.2m–3.6m wide, which fits a king bed comfortably. The larger master suites found in new Brisbane and Gold Coast builds (often 4m+ wide) are where the super king truly shines.
3. King Mattress — Overview, Pros & Cons
The king mattress (183cm × 203cm) is one of Australia's most popular premium sleep choices. It's 30cm wider than a queen — enough for both partners to sleep comfortably without disturbing each other, while still fitting in most standard master bedrooms.
"A king mattress is the sweet spot for the majority of Australian couples. It offers generous personal space without demanding an oversized room. At our stores across Brisbane and the Gold Coast, it consistently outsells every other size."
✓ Pros
- Fits most standard master bedrooms (3.6m+)
- Wide range of bed frames, bedding & accessories
- Two long singles pushed together = one king (split king option)
- More affordable than super king across all mattress types
- 91.5cm per sleeper — plenty of room for most couples
- Easier to move and manoeuvre in hallways
— Considerations
- 20cm narrower than super king — can feel tight for restless sleepers
- Less space if kids or pets regularly join you
- UK/US king sheets won't fit Australian king dimensions
- May feel small in very large master suites (4m+)
Who Suits a King Best?
- Your bedroom measures 3.0m–4.0m wide
- You're a couple wanting generous personal sleep space
- You're upgrading from a queen bed
- You want a wide choice of bed frames and sheets
- Budget is a key consideration
- You live in a standard Brisbane, Ipswich, or Gold Coast home
- Tall individuals (up to ~188cm with comfort)
- Couples who sleep close together
- Rooms with existing built-in wardrobes that limit width
- Split king / adjustable base setups
- Guest rooms in larger homes
4. Super King Mattress — Overview, Pros & Cons
The super king (203cm × 203cm) is Australia's largest standard mattress size. It's perfectly square, giving each sleeper approximately 101.5cm of personal width — comparable to sleeping in a double bed of your own. According to Sealy Australia, the super king is the widest standard mattress available in the country and is growing rapidly in popularity as new-build homes feature larger master suites.
✓ Pros
- ~101.5cm per sleeper — ultimate personal space
- Significantly reduces partner disturbance for restless sleepers
- Ideal for families who co-sleep with young children
- Creates a luxurious centrepiece in a large master suite
- Same length as king — suits tall sleepers equally well
- Growing availability of bedding and accessories in QLD stores
— Considerations
- Requires a bedroom of at least 4.2m × 4.2m
- Harder to move — especially through hallways and up stairs
- Fewer bed frame styles available compared to king
- Requires super king-specific sheets (203cm+)
- Higher price point across all mattress types
- Cannot be made with two long singles
Who Suits a Super King Best?
- Your bedroom is 4m wide or larger
- You or your partner are restless, active sleepers
- Young children regularly sleep in your bed
- You want maximum luxury in a large master suite
- You're building or renovating and can plan around it
- Budget is not the primary concern
- New Queensland builds with large master suites
- Renovated homes with open-plan bedrooms
- Couples with different sleep schedules
- Anyone seeking the ultimate sleep investment
- Families with babies or toddlers who co-sleep
5. Quick Decision Guide: Which Should You Choose?
Still not sure? Use this at-a-glance guide based on the most common scenarios our Queensland customers face.
Choose based on your situation:
6. Mattress Types Available in Both Sizes
Both king and super king mattresses are available in all major mattress types. Your choice of construction should be guided by your preferred sleep feel, heat sensitivity, and budget — not just size. Here's a quick breakdown of what's available:
Pro Tip: For super king beds, pocket spring and hybrid mattresses are particularly recommended — their individually-wrapped coils minimise motion transfer across the wider sleeping surface, which is especially important when sharing a larger bed.
7. Price Comparison
Super king mattresses typically cost 15–25% more than their king equivalents. This premium reflects the additional materials required. Here's a general guide to price ranges in Australia:
| Mattress Type | King (approx.) | Super King (approx.) |
|---|---|---|
| Bonnell Spring (Entry) | $400 – $800 | $600 – $1,000 |
| Pocket Spring (Mid) | $700 – $1,800 | $900 – $2,200 |
| Memory Foam (Mid) | $600 – $2,000 | $800 – $2,400 |
| Hybrid (Premium) | $1,200 – $3,000 | $1,500 – $3,800 |
| Latex (Premium) | $1,500 – $3,500+ | $1,900 – $4,500+ |
Prices are indicative and vary by brand, retailer, and inclusions. Visit any of our 5 Queensland stores for current pricing and promotions.
Total Cost Consideration: Don't forget to factor in the bed frame, mattress protector, and sheets. A super king bed frame typically costs $150–$400 more than a king equivalent, and super king sheets are slightly pricier due to their specialty sizing. Over a 10-year lifespan, the extra investment in a super king averages just cents per night.
8. Bedding, Accessories & What to Buy Next
Once you've chosen your mattress size, you'll need to stock up on the right bedding. This is a critical point many buyers overlook — king sheets will not fit a super king mattress, so make sure everything you buy matches your size.
| Item | King Size Needed | Super King Size Needed |
|---|---|---|
| Fitted Sheet | 183cm × 203cm (min.) | 203cm × 203cm (min.) |
| Flat Sheet / Quilt Cover | King (standard) | Super King (must match) |
| Mattress Protector | King specific | Super King specific |
| Pillows (recommended) | 2–4 standard pillows | 2–4 standard pillows |
| Bed Frame | King frame (190cm× 214cm approx.) | Super King frame (210cm× 214cm approx.) |
9. Frequently Asked Questions
Our Queensland store teams answer these questions every day. Here are the most common ones:
About This Guide: Written by the product and sleep specialists at The A2Z Furniture — Queensland's trusted furniture retailer with 5 stores across Brisbane, Ipswich, and the Gold Coast. Our team has helped thousands of Queensland families choose the right mattress size. This guide is reviewed and updated regularly to reflect Australian sizing standards and our in-store experience. For references, we cite Sealy Australia and Beds n Dreams for size data.
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