upholstery foam chart

An upholstery foam chart takes the guesswork out of rebuilding a sofa, dining chair or window seat. Instead of squeezing samples and hoping for the best, you can match foam density, firmness and thickness to how the piece will actually be used, so your new cushions feel right and hold their shape.

How to Read an Upholstery Foam Chart

Most charts compare foam on three key measures. Understanding each one helps you narrow your options fast.

Density

Density, usually listed in pounds per cubic foot, reflects durability. High density foam generally lasts longer and suits seats that get daily use.

Firmness (ILD Rating)

The ILD rating describes how firm the foam feels. As a general guide:

• Soft: back cushions, pillows and accent pieces
• Medium: sofa seats and everyday lounge chairs
• Firm: dining chairs, benches and outdoor seating

Thickness

Cushion foam thickness affects comfort and seat height. Thinner foam works for chair pads, while deeper foam suits sofas and daybeds.

Find Your Perfect Seat Cushion Foam

Use the chart above as your starting point, then browse the foam and upholstery supplies below to find the right match for your next project.