How to Calculate Concrete Volume for a Slab or Footing

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To figure out concrete for a slab or footing, just multiply the length by the width by the depth (all in feet) to get cubic feet, then divide that by 27 to find cubic yards. For a 10x10 slab that's 4 inches thick (0.33 ft), you'd need about 1.23 cubic yards. Always order a little extra to account for spillage or uneven ground.