Material Calculator For Concrete Slab
Calculate the volume of concrete needed for a slab, including waste factor.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator estimates the volume of concrete needed for a rectangular slab. It calculates in cubic yards and includes a waste factor.
- Enter Slab Dimensions
Input the slab’s Length (ft), Width (ft), and Thickness (inches). All values must be positive numbers. - Set Waste Factor
The default waste is 10%. Adjust as needed (e.g., 5% for precise pours). Enter0for no waste. - Calculate
Click the Calculate button. If inputs are invalid, an error message appears. - Read Results
The result shows:- Volume – concrete needed without waste.
- Volume with Waste – total including the waste percentage (recommended for ordering).
Formula used: Volume (cubic yards) = (Length × Width × Thickness in feet) ÷ 27. Thickness is converted from inches to feet by dividing by 12.
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Frequently Asked Questions
Enter the slab length and width in feet, thickness in inches, and a waste factor percentage (default 10%). Click Calculate to get the volume in cubic yards.
Volume (cubic yards) = (Length (ft) × Width (ft) × (Thickness (in) / 12)) / 27. Then waste is added as a percentage.
A waste factor accounts for spillage, over-excavation, or irregular shapes. Typical values range from 5% to 10%.