Concrete Depot
Concrete Calculators & Tools
Concrete Floor Calculator
Estimate concrete volume, floor area, waste, bag counts, and cost for a concrete floor with a live 3D measurement diagram.
Measurement inputs
Enter floor size and thickness. Results update live.
Used in the PDF report and saved report.
Switches starter units only.
◆ Recommended: 4 in thick · 3,000–4,000 PSI mix
10% is common for normal jobs.
Waste cannot be negative.
Optional. Use 0 if unknown.
Cost cannot be negative.
Use waste volume for safer ordering.
Live 3D floor preview
The same SVG is used in the report.
Length
20 ft
Width
12 ft
Thickness
4 in
Result dashboard
Material estimate for the entered floor size.
Order quantity with waste
Includes 10% waste. Base floor volume is 2.96 cu yd.
3.26 cu yd
Base volume
2.96 cu yd
Cubic feet
80.00 cu ft
Cubic meters
2.27 m³
Floor area
240 sq ft
40 lb bags
294 bags
60 lb bags
196 bags
80 lb bags
147 bags
Estimated cost
$456.30
This is an estimate. Check final quantity with your concrete supplier before ordering.
Formula used
All main measurements are converted to feet before calculation.
Concrete floor volume:
Volume = Length × Width × Thickness