How to Choose the Right Foam Density for Your Project
When it comes to foam products, density matters. The right foam density can mean the difference between a cushion that feels luxuriously supportive for years and one that loses its shape within months. Whether you’re replacing a sofa cushion, creating a custom mattress, or soundproofing a room, understanding foam density will help you make the right choice.
In this guide, we’ll break down what foam density means, the different types available, and how to pick the perfect one for your needs.
What Is Foam Density?
Foam density refers to how much material is packed into a cubic metre of foam. Measured in kilograms per cubic metre (kg/m³), higher density foams contain more material, which generally means:
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Better durability
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Improved support
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Longer lifespan
It’s important to note that density is not the same as firmness. A high-density foam can be soft, while a low-density foam can feel firm—it’s the cell structure and composition that make the difference.
Common Foam Density Ranges
At Foam Supplies WA, we supply foam in a variety of densities to suit different applications:
|
Foam Type |
Density |
Best For |
|---|---|---|
|
Standard Density Foam |
20–25 kg/m³ |
Occasional-use cushions, backrests, craft projects |
|
Medium Density Foam |
27–30 kg/m³ |
Everyday seating, sofa cushions, mattresses |
|
High-Density Foam |
30–35+ kg/m³ |
Heavy-use furniture, caravan seating, marine cushions |
|
Memory Foam |
Varies (40–60 kg/m³ typical) |
Mattress toppers, pressure relief cushions |
|
Acoustic Foam |
N/A (measured differently) |
Soundproofing walls, studios, home theatres |
How to Match Foam Density to Your Project
1. Sofas & Lounge Cushions
For long-lasting comfort, choose high-density foam (30–35+ kg/m³). This helps maintain shape, prevents sagging, and offers strong support even after years of use.
2. Mattress & Bedding
Medium-density foam works well for standard mattresses, while memory foam is great for toppers and added comfort layers.
3. Caravan & Boat Seating
Outdoor and travel seating should use high-density foam, ideally combined with water-resistant covers to withstand moisture and constant use.
4. Craft Projects & Occasional-Use Items
For props, backrests, or low-use cushions, standard density foam is more affordable and perfectly adequate.
5. Soundproofing
Foam density is less important here—acoustic foam is designed for absorbing sound waves, with thickness and shape playing the bigger role.
Pro Tip: Use the Foam Calculator
Not sure how much foam you need? Try our Foam Cut-to-Size Calculator for an instant quote based on your measurements.
Why Choose Foam Supplies WA
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Custom Cut to Size – Get foam shaped exactly to your measurements.
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Wide Range of Densities – From soft and flexible to firm and supportive.
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Local Expertise – Serving Perth and WA with expert advice.
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Eco-Friendly Practices – We repurpose and crumb foam to reduce waste.
Final Word
Choosing the right foam density is the secret to comfort, durability, and value for money. If you’re unsure, our team at Foam Supplies WA can help match you with the perfect foam for your project.
