20cm vs 30cm Mattress: Which Thickness Is Right for You?
Mattress thickness is easy to notice, but it is only one part of choosing the right mattress. A 20cm mattress can create a lower, simpler bed setup, while a 30cm mattress gives the bed a taller profile and may include a different comfort construction. The better option depends on the mattress feel, your bed frame, the total bed height and how you use the room.
Quick answer
Choose the complete mattress, not thickness alone. Compare its firmness, spring construction, total bed height, available sizes and how it pairs with your frame.
20cm vs 30cm mattresses at a glance
Important: a thicker mattress is not automatically softer, firmer or better. Thickness describes the mattress profile; comfort also depends on its internal construction and stated feel.
What does mattress thickness change?
1. The total height of your bed
The finished bed height is the height of the bed base plus the mattress. A tall frame paired with a 30cm mattress can create a noticeably higher sleeping surface. A lower frame with a 20cm mattress can feel more compact and may suit rooms where you want a lighter visual profile.
Before ordering, measure your current bed from the floor to the top of the mattress. This gives you a useful reference for deciding whether you want the new setup to sit higher, lower or at a similar level.
2. The appearance of the bed frame
Mattress height changes how much of the headboard remains visible. On some upholstered frames, a very thick mattress may cover more of the lower headboard. A thinner profile can reveal more of the frame, but the right balance depends on the individual design.
3. Fitted-sheet depth
Fitted sheets have different pocket depths. Check the mattress height and the sheet manufacturer’s measurements before buying new bedding. A 30cm mattress may require a deeper fitted sheet, particularly if you also use a protector or topper.
4. Handling and access
A deeper mattress can be bulkier to move through stairs, lifts, hallways and doorways. Measure the delivery route as well as the bedroom. Our bed delivery checklist explains the access points worth checking before delivery day.
The OzyDreams 20cm option
20cm profile
Charcoal Bamboo Mattress — Medium Soft
This model combines a lower profile with a medium-soft feel and Bonnell spring construction. Its charcoal finish also creates a different visual look from a traditional light-coloured mattress.
View the 20cm mattressConsider the 20cm mattress if you prefer:
- a lower, more streamlined mattress profile;
- a medium-soft stated feel;
- a lower total bed height when paired with your chosen frame; or
- a charcoal mattress finish.
The OzyDreams 30cm option
30cm profile
Pillow Top Bamboo Mattress — Firm Feel
This model has a taller pillow-top profile, a firm stated feel and five-zone pocket-spring construction. The extra height creates a fuller-looking bed setup, so remember to check the combined height with your frame.
View the 30cm mattressConsider the 30cm mattress if you prefer:
- a taller and fuller mattress profile;
- a firm stated feel;
- a pillow-top design; or
- five-zone pocket-spring construction.
How to choose between 20cm and 30cm
- Start with feel: decide whether the listed medium-soft or firm feel is closer to your personal preference.
- Check the construction: compare the Bonnell-spring and pocket-spring product specifications.
- Calculate total bed height: add the frame height to the mattress thickness.
- Check the bedroom: consider headboard visibility, windows, bedside-table height and the overall scale of the room.
- Measure access: confirm the mattress can pass through doorways, stairs and lifts.
- Confirm the size: use our Australian bed sizes guide and check the selected product variant.
Need the frame and mattress together?
A coordinated package makes it easier to compare sizes and choose the complete bedroom setup in one place.
Explore bed & mattress packages20cm vs 30cm mattress FAQs
Is a 30cm mattress automatically better?
No. A thicker mattress has a taller profile, but suitability depends on its construction, stated feel, your frame and your personal preference.
Is a 30cm mattress always softer than a 20cm mattress?
No. OzyDreams’ current 30cm pillow-top model is listed as firm, while the 20cm charcoal model is listed as medium soft. Always check the individual product description rather than judging firmness by thickness.
Will both thicknesses fit a standard bed frame?
Mattress thickness does not change its selected Single, Double, Queen or King footprint, but the full mattress dimensions and the bed-frame specifications should still be checked before ordering.
Do I need deep fitted sheets for a 30cm mattress?
Possibly. Compare the mattress height with the fitted sheet’s stated pocket depth, especially when adding a mattress protector or topper.
When will I see delivery pricing?
Delivery options and pricing are calculated at checkout using the delivery postcode. Eligible local areas may receive local delivery, while other destinations will see available freight options before payment. Read the shipping policy for more information.
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