Concrete Calculator

Calculate how much concrete you need for slabs, footings, columns, and steps. Get results in cubic yards, cubic feet, and 60 or 80-lb bag counts.

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Calculate concrete volume for slabs, footings, columns, and steps. Results in cubic yards, cubic feet, and bag counts.

Units: Imperial (ft/in) Metric (m/cm)

Length (ft)

Width (ft)

Depth / Thickness (in)

Length (ft)

Width (ft)

Depth (ft)

Diameter (in)

Height (ft)

Number of columns

Number of steps Width (ft)

Rise (in)

Run / Tread depth (in)

Add 10% for waste and spillage. Pre-mixed concrete is typically ordered in cubic yards for large pours.

Concrete Calculation Formulas

Slab / Footing: Volume = Length × Width × Depth
Column (cylinder): Volume = π × (Diameter/2)² × Height
Steps: Volume ≈ Sum of individual step volumes (triangular staircase method)
1 cubic yard = 27 cubic feet ≈ 0.7646 cubic meters