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BuildRight
Length × width × thickness, converted to the cubic yards your ready-mix supplier will quote.
Uneven subgrade, spillage, and minor measurement error mean ordering exactly the calculated amount often comes up short — 5-10% extra is standard practice, and running out mid-pour is far worse than a little leftover.
Concrete trucks deliver in cubic yard increments, and most suppliers have a minimum order — check with your supplier before finalizing a small pour, since it may be cheaper to bag your own concrete for very small jobs.
Concrete needed
1.235 yd³
Order 5-10% extra to account for spillage and uneven subgrade.
What you entered
Slab volume in cubic feet
10 × 10 × (4/12)= 33.3333 ft³Convert to cubic yards
33.3333 ÷ 27= 1.2346 yd³Result
Concrete needed: 1.235 yd³
A 10 × 10 ft slab at 4 inches thick needs about 1.2345679012345678 cubic yards of concrete.