upholstery foam density chart

An upholstery foam density chart takes the guesswork out of choosing cushion foam. Density, measured in pounds per cubic foot, tells you how much material is packed into the foam, and that shapes how long a seat keeps its loft and support. Use this quick foam density guide to match foam to your project before you cut.

Cushion Foam Density at a Glance

• Lower density (roughly 1.2 to 1.5 lb): Back cushions, throw pillows, and decorative pieces that see light use.
• Medium density (roughly 1.5 to 1.8 lb): Occasional chairs, headboards, and guest seating.
• High density foam (roughly 1.8 lb and up): Sofa seats, dining chairs, window seats, and benches used every day.

Density vs. Firmness

Density isn't the same as firmness. Firmness is rated separately, often as ILD or IFD, so you can find a soft high density foam or a firm lower density one. For seat cushion foam, pair a durable density with the foam firmness ILD that feels right to you.

What to Check Before You Buy

Measure the cushion thickness you need, think about who will use the piece and how often, and note whether it will live indoors or outdoors.

Ready to rebuild your seating? Browse the foam options below to find the right fit for your next project.