Concrete Calculator

Estimate cubic yards or meters of concrete needed for slabs, footings, columns, and stairs.

Unit System

Price per cubic yard (optional)

Calculate concrete for rectangular slabs such as patios, driveways, and garage floors.

L: ft × W: ft × D: in

Calculate concrete for wall footings and continuous strip foundations.

L: ft × W: ft × D: in

Calculate concrete for round or square columns and pillars.

Shape

Diameter: in × Height: ft × Qty:

Calculate concrete for a set of stairs based on step dimensions and platform.

Stair Width (ft)

Number of Steps

Rise per Step (in)

Run (Tread Depth) (in)

Platform Depth (ft)

Slab / Footing (rectangular):

Volume = Length × Width × Depth

Round Column:

Volume = π × (Diameter / 2)² × Height

Square Column:

Volume = Side × Side × Height

Stairs:

Volume = Width × Σ(step rise × run × step count) + platform

Each step is treated as a rectangular block. The staircase volume is the sum of all step blocks plus any top platform.

Add 5–10% extra to your estimate for waste and spillage
Ready-mix trucks typically deliver in increments of 0.25 cubic yards
A standard 80 lb bag of pre-mixed concrete yields about 0.6 cubic feet (0.022 cu yd)
For large pours (> 1 cubic yard), ready-mix delivery is usually more economical
Ensure forms are secure and level before pouring

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