← FERKETICH Labs
Construction calculator.
Concrete quantity worksheet
Start with this 24 × 12 ft patio example or enter your measurements. The worksheet assumes one rectangular pour with a uniform thickness.
Concrete with allowance
3.911 cu yd
- Footprint
- 288 sq ft
- Perimeter
- 72 ft
- Net volume
- 96 cu ft
- Before allowance
- 3.556 cu yd
Formulas and assumptions
Footprint = length × width. Perimeter = 2 × (length + width). Multiply footprint by thickness in inches, divide by 12 to obtain cubic feet, then divide by 27 to obtain cubic yards. Apply the selected allowance to the unrounded net volume.
Displayed quantities are rounded to three decimal places. Measure openings, footings and thickened edges separately. Confirm site dimensions and supplier order increments before purchasing.