ConstructionCALCULATORLAB

Concrete & masonry

Concrete Calculator

Enter the shape and measurements of your pour to find the concrete volume you need. The calculator shows cubic yards, cubic feet, metric volume and optional bag equivalents.

Your measurements

Calculated in your browser
Advanced options Extra allowances & optional details
Optional allowance you choose. 0 means no extra; it is not a recommendation.
Product-specific reference, not a universal yield. Verify your package.
Editable. Reference presets use Concrete Mix No. 1101.
Try an example:Examples are not recommended dimensions or prices.

YOUR MATERIAL ESTIMATE

WidthLengthDepthDiameterDepth
Input measurements and units are shown on this schematic; not to scale.

A clearer quantity starts here.

Enter your measurements, check the units and calculate. Your result will include the assumptions and rounding steps.

THE WORKFLOW

How to use this concrete calculator

  1. Choose rectangular volume, wall / trench or round column mode.
  2. Enter the dimensions, confirm their units and set the number of pours.
  3. Add optional waste, calculate and compare net volume with order volume.

Formula & assumptions

Rectangle: V = L × W × D × quantity. Cylinder: V = π × (diameter / 2)² × depth × quantity. Order = net × (1 + waste / 100).

Dimensions describe the project, not its suitability. Rectangular walls and trenches use the same prism formula. Constant dimensions and uniform depth are assumed. One cubic yard is 27 cubic feet.

See methodology and sources →

AN ARITHMETIC EXAMPLE, NOT A RECOMMENDATION

Worked example

Arithmetic example only: one cylinder 2 ft in diameter and 6 ft high, no extra. These dimensions are not a design recommendation.

0.698 yd³Concrete to order
  • Net volume0.698 yd³
  • Order volume0.698 yd³
  • Order volume18.85 ft³
  • Order volume0.534 m³
Example calculation

Geometry: base area 0.291864 m² × depth 1.8288 m × quantity 1 = 0.53376 m³.

Extra: 0.53376 m³ × (1 + 0 / 100) = 0.53376 m³. Conversion: divide m³ by 0.764554857984 to obtain yd³.

Bags: 18.849556 ft³ ÷ 0.6 ft³ per bag = 31.415927; round up to 32.

Common questions

Does this choose dimensions for my project?

No. Enter dimensions from your project plan. The calculator measures quantity, not structural suitability.

How much extra should I enter?

Use the allowance appropriate to your measurements, project conditions and supplier. The field is editable; there is no universal waste percentage.

Related calculators

Concrete Slab CalculatorConcrete Bag CalculatorConcrete Cost Calculator

Estimates only. Verify measurements and manufacturer packaging/yields. Project conditions vary. This tool does not provide structural engineering advice. Read the disclaimer.