Cómo se calcula
Rectangular slab: length × width × thickness. Round column: π × (diameter / 2)² × height. Tube: π/4 × (outer diameter² − inner diameter²) × height. Curb/gutter: add the cross-sectional rectangles, then multiply by length. Solid stairs: add each riser's increasing step height and any full-height platform.
Preguntas frecuentes
Does this include waste or spillage?
Enter your extra allowance percentage to see an order estimate. The displayed volume and weight include the extra allowance if you enter one; otherwise they represent the geometric volume.
How accurate is the concrete mass?
Weight uses a selectable-volume estimate and assumed pre-mixed concrete density of 2,130 kg/m³ (about 133 lb/ft³). Bag equivalents are mass ratios, not verified bag yields. Use the bag manufacturer’s actual volume yield to plan purchases.
Are stairs hollow or solid?
These are modeled as fully solid concrete steps plus a solid, full-height platform. Do not use this for hollow/precast stairs without adjusting the volume.
How is the curb calculated?
The curb and gutter are two adjacent, non-overlapping rectangular cross-sections, not a complete roadway profile. Consult your project drawing.
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Planning and safe use
Measurements and assumptions determine the result. Check actual slab edges, slopes, footings, voids, rebar displacement, tolerances and formwork. Engineering sizing and structural requirements should be checked against project specifications.