House Construction Cost Calculator
Build a planning-level cost estimate from floor area and assumptions.
Free construction calculator
Concrete Calculator
Calculate concrete volume from length, width and depth. Add a waste allowance for a practical planning estimate.
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Estimate
Enter values to calculate.
This is a planning calculator. Actual quantities depend on specifications, waste, site conditions, local units and construction practice.
How the calculation works
Concrete volume = length × width × depth. Keep all dimensions in the same unit before calculating.
Example: a 20 ft × 10 ft slab at 0.33 ft depth is about 66 cubic feet before waste.
Before you order materials
Check the drawing, dimensions, openings, mix or product specification and local supplier units. For structural work, follow the project engineer's specification rather than an online estimate.
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