Concrete Volume = Length × Width × (Thickness/12) in cubic feet, divided by 27 for cubic yards.
Always order 10% extra for waste. A 4-inch slab is standard for patios and walkways.
Reach for this calculator when preparing a materials budget or order list. The quantity estimate is based on industry-standard coverage rates with a default waste factor, producing a figure that is appropriate for actual procurement.
The most costly mistake is ordering the precise calculated quantity with no waste allowance. Cuts, breaks, and fitting invariably consume 5–15% of materials beyond the theoretical coverage area. Always add a buffer before placing an order.
A homeowner tiles a 4.2m × 3.8m bathroom floor using 600mm × 600mm tiles. The calculator estimates 47 tiles needed plus a 12% waste allowance — recommending an order of 53 tiles to account for cuts around the perimeter and a spare in case of breakage.
Ready-mix concrete costs
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