Concrete calculator
Estimate outputs: Area, Volume, Bags. Adjust Length, Width, Thickness to match your project.
Estimate outputs: Area, Volume, Bags. Adjust Length, Width, Thickness to match your project.
Inputs and units
Use the units shown beside each field. Replace the sample values with your measurements and the figures on the selected product packaging.
| Parameter | Example input |
|---|---|
| Length | 6 m |
| Width | 4 m |
| Thickness | 10 cm |
| Volume yield per bag | 12 l |
| Waste allowance | 5 % |
Formula and assumptions
VolumeLength × Width × Thickness / 100 × (1 + Waste allowance / 100)
Bagsceil((Length × Width × Thickness / 100 × (1 + Waste allowance / 100)) × 1000 / Volume yield per bag)
ceil = round up; floor = round down; max = the greater value. Trigonometric angles are converted from degrees to radians.
Allowance is applied before rounding to whole packages. Whole units are rounded up; displayed decimals are rounded only for readability.
Geometry and material quantities do not determine load capacity or reinforcement design. Use dimensions specified in the project.
Worked example
Sample values are examples, not product specifications. Run the calculation again with your own measurements.
| Result | Calculation |
|---|---|
| Area | 24 m² |
| Volume | 2.52 m³ |
| Bags | 210 |
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