Calculate concrete volume and bag count for flat slabs, patios, and floors.
Slab Dimensions
ft
ft
in
%
Slab Volume Estimate
Enter dimensions to calculate slab volume
About this calculator
Overview
Slabs are the most common concrete structure in residential construction. Whether it's a basement floor, a garden patio, or a shed base, calculating the volume accurately ensures you have enough material for a continuous pour, avoiding cold joints.
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Pro Tips
For large slabs, plan where your expansion joints will go to control where the concrete cracks.
Use a 'strike-off' board (screed) to level the concrete immediately after pouring.
One cubic yard of concrete covers 81 sq. ft. at 4 inches thick.
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Fun Facts
"A standard 4-inch (10cm) slab is perfect for most foot traffic and light vehicles."
"Curing (keeping the slab moist) for at least 7 days can double its strength."
"Adding a vapor barrier under a slab helps prevent moisture from seeping into your home."
