How to Calculate the Amount of Concrete Needed for a Foundation Slab
Multiply your slab’s length × width × thickness (in feet), then divide by 27 to get cubic yards. For a 30′ × 40′ slab at 4″ thick: 30 × 40 × 0.33 = 396 cubic feet ÷ 27 = 14.67 yards. Always add 5-10% for waste, bringing your order to 15.4-16.1 cubic yards. AtGilbert Concrete,…



