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Concrete Calculator for 12x12 Slab (4" Depth)

For a 12' x 12' slab with 4" depth, you need 1.78 cubic yards of ready-mix concrete.

Concrete Slab Estimator

Calculate cubic yards, cubic feet, and 60lb/80lb premixed bags.

Cubic Yards
1.78 yd³
Cubic Feet
48.0 ft³
Premix Bags
~80 80lb / ~107 60lb

Step-by-Step Worked Explanation

Volume = 12 x 12 x (4/12) = 48.0 cubic feet. Cubic Yards = 48.0 / 27 = 1.78 yards. 80lb Bags = 81 bags.
Mathematical FormulaLaTeX Standard
\text{Cubic Yards} = \frac{L \times W \times D}{27}

Explanation: Length (ft) times Width (ft) times Depth (ft) divided by 27 cubic feet per cubic yard.

Frequently Asked Questions

How many 80lb bags for a 12x12 slab?

You will need approximately 81 bags of 80lb premixed concrete.

Need a different variation or custom calculation?

Open the full interactive Concrete Calculator tool.

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