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Everyday Tools Calculator
Concrete Calculator
Estimate concrete volume for slabs, footings and round columns with waste, bag count, cubic yards, cubic meters and estimated cost.
Concrete dimensions
ft³ per bag when using feet, m³ per bag when using meters.
Volume formulas
Slab volume is length x width x thickness. Round column volume is pi x radius² x depth.
The calculator converts the result to cubic yards, cubic meters and cubic feet.
Ordering tips
Add waste for uneven excavation, overdigging, spills and finishing. Many small projects use bags; larger projects usually order ready-mix.
When in doubt, confirm quantities with your contractor or supplier before ordering.
Concrete Calculator FAQ
How do you calculate concrete volume?
For a slab or rectangle, multiply length by width by thickness. For a round column, use pi x radius squared x depth.
Why add waste?
Concrete projects often need extra material for uneven ground, spills, form variation and finishing.
What units does the concrete calculator support?
It supports feet and meters, and reports cubic yards, cubic meters and cubic feet.
How are bag counts estimated?
The calculator divides total cubic feet needed by the bag yield you enter, then rounds up.