Foam Board Weight Calculator

EPS (expanded polystyrene) is the lightest at 2 lb/ft³ with R-3.6-4.2 per inch. XPS (extruded polystyrene) is denser at 2.5 lb/ft³ with R-5.0 per inch and better moisture resistance. Polyiso (polyisocyanurate) is the densest at 2.8 lb/ft³ but offers the highest R-value at R-5.6-6.5 per inch.

Calculate the volume in cubic feet (length × width × thickness, converting inches to feet), then multiply by the foam's density. For example, a 4'×8'×2" EPS board is 5.33 ft³ × 2 lb/ft³ = 10.67 lbs.

Weight affects handling ease, shipping costs, and structural load considerations. Lighter boards like EPS are easier for solo installation and reduce shipping expenses, while heavier boards may require more labor but often provide better insulation performance.

Yes, most foam board sheets are lightweight enough for one person to carry. A standard 4'×8'×2" sheet weighs 10-15 lbs depending on type, though larger sheets or thicker panels may require two people due to size and wind resistance.

A typical bundle contains 6-12 sheets depending on thickness. A bundle of ten 4'×8'×2" EPS sheets weighs about 107 lbs, while the same XPS bundle weighs around 133 lbs, which affects delivery and storage logistics.