Calculators
Concrete Volume Calculator — Slabs, Columns & Multiple Pours
Calculate concrete in cubic metres and litres for rectangular slabs and round columns. Combine differently sized pours and add an optional waste allowance.
Quantity estimate only, not structural or reinforcement design. Enter non-overlapping parts to avoid counting concrete twice.
Help and method
Rectangle: length × width × (depth in cm ÷ 100) × count. Round column: π × (diameter in cm ÷ 200)² × height in m × count. Sum unrounded volumes, then apply the allowance once to the total. 1 m³ equals 1000 L. The allowance is chosen by you, not a universal recommendation. Bag counts require the yield of the specific mix and are not calculated here. Length, width and height: 0.000001–10000 m; depth: 0.000001–10000 cm; diameter: 0.000001–1000000 cm; count: 1–1000000 whole items; allowance: 0–100%. Total volume up to 1000000000 m³.
OpenStax — VolumeQUIKRETEMethods and reliabilityWorked example
An example you can try or adapt to your own values.
- Length
- 3 m
- Width
- 2 m
- Depth
- 10 cm
- Number of identical items
- 1
- Extra allowance
- 0 %
Result
Concrete required: 0.6 m³; Volume in litres: 600 L