Concrete Calculator
Calculate concrete volume for a slab with mixed units and an optional waste allowance.
Rectangular slab volume
Enter length, width, and thickness with their units. Every dimension is normalized to meters before multiplication.
Volume = length × width × thickness
Allowance and output units
Results include cubic meters plus cubic feet and yards. For example, 5 m × 4 m × 10 cm equals 2 m³ before an allowance.
Frequently asked questions
Can thickness be entered in centimeters?
Yes. Each dimension has an independent unit selector.
Is an allowance required?
No. Leave it blank or zero for geometric volume only.
Does this calculate bags or mix design?
No. It calculates volume; mix requirements depend on the product and project.
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