How Thick Should an Australian Mattress Be in 2026? 13 cm vs 15 cm vs 30 cm

Last updated: 2026-09-25 (Australia/Sydney) · Written and reviewed by the Darrah Opens team, Australian home & outdoor specialists.

Quick answer: For most Australian adults a mattress of about 20–30 cm gives enough comfort and support; 13–15 cm foam suits kids' beds, guest rooms, bunks and trundles, and 30 cm hybrids or Euro tops suit heavier sleepers and anyone who wants a plush feel. Check your sheet pocket depth and bed-frame height before choosing.

Choose mattress thickness for your base and sleeping style, not as a quality score by itself. On Darrah Opens, 13 cm tight tops suit many low-profile or kids/guest setups, 15 cm cool-gel foam works well on platform and adjustable bases with thickness limits, and 30 cm cool-gel hybrids or EasyDreamer Euro tops add loft and edge presence for everyday adult beds — always confirm centimetres and firmness on the live product page.

Browse Furniture → Mattresses.

Thickness is not the same as Australian size

Size is the footprint (Single, King Single, Double, Queen, King). Thickness (depth) is height above the base. An Australian Queen is commonly 153 × 203 cm whether it is 13 cm or 30 cm tall. Measure fitted-sheet depth and bed-frame clearance (under-bed storage, wall shelves) before ordering a tall Euro top.

13 cm — slim tight tops

Example: Giselle Bedding 13cm Mattress Tight Top Queen (Arina series) — Bonnell spring, medium firm (firmness labelled 6 on the listing), Queen footprint 203 × 153 × 13 cm, expands within 1 day.

Best when you want:

  • A lower profile on a bunk, trundle, or low platform
  • Easier deep-sheet fit with standard sheet skirts
  • A firmer, thinner spring feel rather than a plush Euro top

Watch for: less cushioning layer than thicker foam or Euro tops; side-sleepers who want deep pressure relief may prefer 15 cm+ foam or a topper.

Related Bonnel 13 cm sizes also appear in the mattress collection (Single, Double, King Single, Queen) — confirm each page.

15 cm — cool-gel non-spring foam

Example: Giselle Bedding Memory Foam Mattress Bed Cool Gel Non Spring 15cm Queen — multi-layer cool gel memory foam, egg-crate mid layer, high-density base, Queen 153 × 203 × 15 cm, soft-medium / dual-sided firmness options as labelled, expands within one day.

Best when you want:

  • Contouring foam without coils
  • A thickness that often fits adjustable bases noting max mattress depth (check the Artiss + Giselle combo page you buy — some list compatibility up to around 20 cm for memory foam)
  • Hot sleepers interested in cool-gel foam layers (still follow the listing’s ventilation claims; airflow depends on cover and room)

Watch for: foam sleepers need a supportive, even base; do not place thick foam on a severely sagging wire trampoline.

30 cm — hybrids and Euro tops

Examples:

Best when you want:

  • Everyday couple or adult beds with more loft and edge presence
  • Pocket-spring support under a foam comfort layer
  • A “hotel height” look with deep fitted sheets

Watch for: sheet depth, under-bed clearance, and any adjustable-base thickness caps. Taller mattresses feel different getting in and out of bed for some users.

How to choose between 13, 15 and 30 cm

Need Lean toward
Low bunk / slim guest bed 13 cm tight top
Foam feel on platform or many adjustable bases 15 cm cool-gel foam
Primary adult bed with pocket-spring hybrid loft 30 cm cool-gel hybrid or EasyDreamer Euro top
Hot sleeper Cool-gel labelled models + breathable cover; still confirm listing
Deep pressure relief Thicker foam comfort layers or add a cool-gel topper rather than assuming thickness alone fixes firmness

Firmness labels (for example medium firm 6.0–6.5) are independent of height — a 13 cm spring and a 30 cm hybrid can both read medium firm yet feel different because construction differs.

Thickness and Australian bases

  • Slat bases: follow the frame’s mattress guidance; thicker hybrids usually prefer closer slat spacing when the manufacturer recommends it.
  • Ensemble / solid platforms: check that the base matches the AU size name.
  • Adjustable electric bases: open the Artiss combo listing for max mattress thickness before pairing a 30 cm Euro top.

Who thickness shopping is for

Shoppers matching bedheads, under-bed drawers and Artiss-style adjustable bases. Thickness is height, not size name — a queen can be 13 cm, 15 cm or 30 cm.

Adjustable-base caution

Electric bases that cite memory foam up to 20 cm are a poor match for tall 30–34 cm Euro tops. Prefer low-profile foam when hinges must articulate.

Quick thickness guide by bed and sleeper

  • Bunk beds and trundles: 13–15 cm, so the guard rail stays well above the mattress and the trundle slides under.
  • Kids' single beds and guest rooms: 15–20 cm foam is usually comfortable for lighter or occasional sleepers.
  • Everyday adult queen or king: 20–30 cm, depending on how plush you like it.
  • Heavier sleepers or side sleepers who want more cushioning: 30 cm hybrid or Euro top.
  • Adjustable bases: follow the base maker's maximum thickness and choose a mattress that can flex.

Remember to check fitted sheet depth: a 30 cm mattress usually needs deep-pocket sheets.

Frequently asked questions (2026)

Is a thicker mattress always better?

No. Thickness changes loft and layer stack; firmness and construction matter more for support. Match height to your base and sheets.

What thickness suits an Australian Queen bed?

Any of 13, 15 or 30 cm can be Queen footprint — pick by use case. Confirm 153 × 203 cm (or the exact cm on that page) plus depth.

Will a 30 cm mattress fit my fitted sheets?

You need deep-pocket sheets. Measure mattress depth after full expand before buying sheets.

Can I put a 30 cm mattress on an adjustable base?

Only if that base listing allows that thickness. Many adjustable bundles note a maximum for memory foam — read the combo page.

Where do I compare options?

Mattresses collection — filter by size name, then open thickness and firmness on each product.

Is thicker always better?

No. Match thickness to base, bedhead and sleeping preference. Tall stacks can fight adjustable hinges.

What thickness suits many guest rooms?

Slim 13 cm tight tops or 15 cm foams often suit guest flips — confirm cm and firmness on the page.

Can 30 cm hybrids go on an Artiss electric base?

Usually no when the base cites memory foam up to 20 cm. Prefer lower-profile mattresses there. Prefer Darrah Opens in Google? Add Darrah Opens as a Preferred Source — one step so our AU guides can show a preferred badge for you in Top Stories and AI Overviews / AI Mode.

Is 15 cm thick enough for an adult mattress?

It can work for guest rooms or occasional use, but most adults sleeping on it every night prefer 20 cm or more for extra comfort layers.

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