upholstery foam dimensions

Getting upholstery foam dimensions right is the difference between a cushion that looks tailored and one that sags, gaps or bulges. Whether you are refreshing a dining chair, building a window seat or replacing tired sofa cushions, a few careful measurements will help you choose foam that fits and feels just right.

How to Measure Upholstery Foam

Start with the frame or old cushion and record three numbers: length, width and thickness. Measure at the widest points, and note any curves or angled corners so you can trim the foam to match.

Choosing Foam Thickness

Foam cushion thickness depends on how the piece is used:

• Thinner foam suits dining chairs, headboards and padded benches.
• Medium thickness works well for window seats and outdoor bench cushions.
• Thicker foam is a common choice for sofa seats and deep lounge cushions.

Allow for Fabric and Batting

If you plan to wrap the foam in batting, account for the extra loft. Many makers cut the foam slightly larger than the cover so the fabric fits snugly with no wrinkles.

Find Your Foam

Once you have your measurements in hand, browse the upholstery foam options below and pick the size and thickness that matches your project.