upholstery foam cutting

Good upholstery foam cutting is what separates a cushion that looks professionally made from one that sags, bulges, or fits awkwardly inside its cover. Whether you are replacing a tired dining chair seat or building custom bench cushions, a few simple tools and techniques will give you crisp, square edges every time.

How to Cut Upholstery Foam Cleanly

Measure and Mark First

Measure your seat or frame carefully, then add a little extra, often about half an inch, so the foam fills the cover snugly. Mark your lines on the foam with a felt-tip marker and a straightedge.

Choose the Right Tool

• Electric knife: the go-to choice for cutting foam for cushions, especially thick or high density foam.
• Long serrated blade: works for thinner pieces when used with slow, steady strokes.
• Utility knife: handy for trimming batting and shallow cuts.

Let the Blade Do the Work

Keep the blade vertical and avoid pressing down, which compresses the foam and causes uneven, slanted edges. Wrapping the finished piece in batting softens any small imperfections.

Find Your Foam and Supplies

Ready to start? Browse the foam, batting, and cutting essentials below to find everything you need for your next cushion project.