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Concrete calculator
Calculate geometric concrete volume for common forms, add a waste allowance, and keep supplier yield assumptions separate from the math.
What this tool does
Choose the geometric form, enter its dimensions, and add a waste allowance to create a volume planning estimate.
Calculator
Choose a form and enter its dimensions.
This calculates geometric volume and adds your waste allowance. It does not replace supplier or manufacturer yield guidance.
Calculation result
Your result
Enter details to see the estimate.
The result separates wall area, coverage, waste allowance, and the rounded quantity to consider buying.
How it works
Rectangular slabs and footings use length × width × depth. Columns use length × width × height. Cylinders use π × radius² × height. Waste is then added as a percentage of geometric volume.
Assumptions
- The selected form is represented by a simple rectangular or cylindrical solid.
- Dimensions use one consistent unit system.
- The result is geometric volume plus the waste percentage you enter.
Limitations
- This calculator does not apply concrete mix yield, truck minimums, pump loss, slump requirements, or supplier rounding.
- Real forms may have slopes, voids, reinforcement, irregular edges, or additional volumes not represented here.
- Confirm the final order with the concrete supplier or a qualified professional.
Good to know
Frequently asked questions
Does this tell me exactly how much concrete to order?
No. It calculates geometric volume and adds your waste allowance. A supplier may apply yield, minimum order, truck, or delivery requirements.
Which form should I choose for a footing?
Choose Footing for a rectangular footing and enter its length, width, and depth.
Why is waste separate from volume?
Waste is a planning allowance for uneven excavation, spillage, form variation, and handling. It is not part of the geometric shape itself.
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