Calculate concrete volume from your measurements. Start with a simple slab, or add identical sections and an optional waste allowance.
01 / MEASURE YOUR PROJECT
Start with a slab. Add a different shape, identical sections or waste allowance only if you need them.
02 / CONCRETE VOLUME
Enter your measurements and select Calculate Concrete to see the base volume and total required.
03 / HOW IT IS CALCULATED
Slabs and rectangular footings: length × width × depth. Walls: length × height × thickness. Cylinders and round slabs: π × (diameter ÷ 2)² × height or depth. Tubes: π ÷ 4 × (outside diameter² − inside diameter²) × height.
Base volume = one section × quantity. Total = base volume × (1 + waste percentage ÷ 100).
Lengths are converted to meters before calculation using 1 ft = 0.3048 m, 1 in = 0.0254 m and 1 yd = 0.9144 m. One cubic yard is 27 cubic feet. Display rounding never changes the calculation.
This estimates volume for uniform shapes. Wall openings are not deducted. It does not specify structural dimensions, reinforcement, mix ratios or material costs.
Calculations stay in your browser, without uploads or storage.
Enter your values locally; no inputs are uploaded.
Check validation feedback before reviewing the browser-generated result.
Review the explanation, copy supported outputs or reset the workspace.
Enter each dimension with its unit. Open Advanced for project shape, quantity or waste allowance, then select Calculate Concrete. Copy Results includes the base volume and total in all three volume units.
Simple slab inputs, construction-focused shapes, accurate unit conversion and clearly separated base and waste volumes.
Measurements and calculations stay in your browser without uploads or storage.
Slabs and rectangular footings use length × width × depth. Cylindrical columns use π × (diameter ÷ 2)² × height. All lengths are converted to meters before calculation.
Yes. Each dimension supports meters, centimeters, millimeters, feet, inches or yards. Changing a display unit preserves the original unrounded measurement until you edit it.
Base volume is the geometric volume multiplied by the number of identical sections. Total concrete adds your chosen waste percentage to that base volume.
No. Waste defaults to 0%. You may enter your own allowance from 0 to 100%, or leave it blank for none. The tool does not choose an allowance for your project.
Measure the full diameter across the circular face, not the radius, and the vertical height. This calculation assumes a solid, uniform cylinder.
No. It estimates volume only, without structural sizing, reinforcement, mix ratios, bag quantities or costs. Displayed values are rounded to up to 12 significant digits.