What is the difference between foam density and firmness?

Density is the weight per cubic foot and determines durability. Firmness (ILD rating) is how much force it takes to compress the foam. High-density foam can be soft or firm. For upholstery, you want high density (long-lasting) with your preferred firmness level.

When should I use high-resilience (HR) foam?

HR foam is recommended for high-use furniture like family room sofas and commercial seating. It bounces back to its original shape faster, resists body impressions, and typically lasts 10-15 years. Standard foam averages 5-7 years.

Can I mix foam types in one piece of furniture?

Yes, many upholsterers use different foam types for seats vs. backs. Seat cushions need higher density for support, while back cushions can use softer, lower density foam or a combination of foam and fiber fill for a plush feel.

How thick should cushion foam be?

Standard seat cushions use 4-5 inch thick foam, but T-cushions and deep seats may need 5-6 inches. Back cushions are typically 3-4 inches. Always factor in compression — foam compresses 10-20% under body weight over time.

Upholstery Foam Density Selector

Select the ideal foam density and type for any upholstery project. Match foam characteristics to furniture use, comfort preferences, and budget to ensure lasting comfort.

Foam Selection Criteria

Usage Level

Comfort Preference

Foam Type

Furniture Piece

Foam Thickness (inches)

Add Dacron wrap (1" thick)

Foam Recommendation

Set your criteria and click "Get Recommendation" to see results.

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Frequently Asked Questions

For everyday sofa cushions, 1.8 to 2.5 lb density foam is ideal. Higher density (2.5+) lasts longer and holds its shape but feels firmer. Pair with a Dacron wrap for a softer feel on the surface.

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Disclaimer: This tool provides estimates for planning purposes only. Actual material requirements, costs, and timelines may vary based on specific project conditions, fabric characteristics, and craftsmanship requirements. Always verify calculations with your own measurements and professional judgment.