Concrete Calculator

A flat rectangular pour such as a patio, shed base, driveway section or garage floor.

Units
Your measurements

Measure the finished slab depth, not the excavation.

Pouring several identical shapes? Enter the count here instead of adding them up.

A rectangular slabA flat rectangular slab drawn in three dimensions. Length runs along the front edge, width along the side edge, and thickness is the vertical depth of the slab.LengthWidthThickness
Measure the finished slab, not the excavation.
Adjust estimate

Waste, compaction, density and price. Sensible defaults are already applied, and whatever is in use is listed under the result.

%

Extra to cover spillage and an uneven subgrade. Running short mid-pour is the expensive mistake.

per yd³

Optional. Leave at zero to skip the cost estimate. Use your own supplier quote.

Result

You need about 1.36 cubic yards of concrete for this slab.

Includes a 10% overage allowance.

Based on: 10% overage allowance · concrete density 140–150 lb/ft³ · typical published bag yields

Same volume in cubic feet
36.7ft³
Same volume in cubic metres
1.04m³
Approximate weightest.
5,133–5,500lb
40 lb bagsest.
123bags
50 lb bagsest.
98bags
60 lb bagsest.
82bags
80 lb bagsest.
62bags

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