Estimate concrete for slabs, footings, walls, circular slabs, columns, and solid steps using US customary or metric dimensions.
Select the project shape, enter each dimension in its actual unit, then apply quantity and a waste allowance. CalcRocket converts every length to meters before calculating one canonical cubic-meter volume.
The exact estimate remains visible alongside cubic feet, cubic yards, and cubic meters. An optional ordering suggestion rounds cubic yards upward to the next tenth without implying a supplier minimum.
All dimensions are normalized before multiplication.
volume = length × width × thickness or depthCircular projects use Math.PI at full precision.
volume = π × (diameter ÷ 2)² × thickness or heightThis models equal solid steps as stacked rectangular prisms, not hollow or precast stairs.
volume = width × tread depth × riser height × n(n + 1) ÷ 2Waste is applied once after quantity multiplication.
recommended volume = base volume × (1 + waste % ÷ 100)A 10 ft × 12 ft slab that is 4 in thick uses 40 ft³, or about 1.4815 yd³. With 10% waste, the estimate is about 1.6296 yd³.
A 5 m × 4 m slab that is 10 cm thick uses 2 m³. With 10% waste, the recommended volume is 2.2 m³.
A 2 m diameter, 3 m tall cylinder uses π × 1² × 3, or about 9.424778 m³ before quantity and waste.
Choose the unit beside each dimension; US thickness can remain in inches while other dimensions use feet.
Use a project-appropriate allowance for spills, uneven excavation, form variation, and measurement uncertainty.
Enter the yield printed on the specific product bag. Yields vary by mix and manufacturer, so no universal default is assumed.
One cubic yard equals 27 cubic feet. Results use the shared CalcRocket volume conversion system, including 1 cubic meter ≈ 35.3147 cubic feet.
Bag size alone does not establish yield. When a product's yield per bag is entered in cubic feet, the calculator divides recommended volume by that yield and rounds the purchase count upward.
Choose the shape, enter positive dimensions and quantity, then add an appropriate waste allowance.
There are exactly 27 cubic feet in one cubic yard.
Multiply length, width, and thickness after converting them to compatible units, then divide cubic feet by 27.
Enter the planned design thickness. This calculator does not recommend structural thickness.
The calculator uses π times radius squared times thickness.
Each round column uses the cylinder formula, then the result is multiplied by the number of columns.
The appropriate allowance depends on measurements, excavation, placement, and supplier practices. Presets are conveniences, not requirements.
It can account for spills, uneven surfaces, form variation, and minor measurement differences.
Enter the yield per bag shown by the manufacturer. The calculator rounds the resulting bag count upward.
Yes. Bag weight, mix, water, and manufacturer specifications can affect stated yield.
No. Optional pricing is a material-only estimate and excludes delivery, taxes, pumping, short-load fees, and labor.
Yes. Metric mode supports meters and centimeters and displays cubic meters prominently.