Estimate concrete volume and pre-mixed bag counts for slabs, columns, circular slabs, curb & gutter barriers, and stairs. Based on 133 lb/ft³ (2,130 kg/m³) density. All dimensions accept feet, inches, yards, meters, or centimeters.
Rectangular prism. Formula: V = Length × Width × Thickness × Quantity
Cylinder. Formula: V = π × (Diameter / 2)² × Depth × Quantity
Cylindrical ring. Formula: V = π × ((d1/2)² − (d2/2)²) × Height × Quantity. Inner diameter must be smaller than outer diameter.
L-shaped cross-section extruded along a length. Formula: V = (Curb Depth × Curb Height + Gutter Width × Flag Thickness) × Length × Qty
Stair wedge + platform. Formula: V = Width × Rise × Steps × (0.5 × Run × Steps + Platform Depth)
Calculate exactly how much concrete you need for your project with our free concrete calculator, supporting slabs, footings, and columns.
Concrete Volume = Length × Width × Depth (or Height for columns), converted to cubic yards or cubic meters depending on your preferred units. For circular columns, volume uses π × radius² × height.
Yes, ordering 5-10% extra is common practice to account for spillage, uneven ground, and formwork inconsistencies.
Concrete is commonly sold by the cubic yard (US) or cubic meter, ready-mix trucks typically have minimum order quantities, check with local suppliers.
No, this calculates gross concrete volume; reinforcement (rebar) typically doesn't significantly reduce the concrete volume needed and is usually not subtracted.
Both use the same volume formula, but footings are typically calculated for individual sections (like a strip footing), while slabs cover a broader flat area.