The calculation, explained.
Volume in cubic feet = length in feet × width in feet × depth in inches ÷ 12, then apply the entered allowance. Divide by 27 for cubic yards. Bag count rounds up using entered yield.
Review the example assumptions and results
- Length
- 10 ft
- Width
- 12 ft
- Thickness
- 4 in
- Extra material
- 0 %
- Bag yield
- 0.6 ft³
- Volume
- 40 ft³
- Cubic yards
- 1.4815 yd³
- Bags
- 67
How this tool works
Adjust the labeled inputs to see a new calculation. Units and assumptions are shown beside each field. Printed and copied results use the same calculation.
This is a planning estimate, not a structural design, permit document or binding quote. Check product specifications and actual site measurements.
A worked example for this tool
ConstructionHow Much Concrete for a 10 × 12 Slab?
Concrete volume changes directly with thickness. Always convert inches to feet before multiplying footprint by depth.
Read the worked example ↗Keep going
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