Concrete Calculator
Enter slab dimensions and a waste allowance. The calculator converts your dimensions to volume in cubic feet, cubic yards, and cubic meters.
Enter project details
Prices shown are editable example values. Confirm actual material yield, supplier prices, and site conditions.
Enter slab dimensions and a waste allowance. The calculator converts your dimensions to volume in cubic feet, cubic yards, and cubic meters.
Formula and assumptions
Formula: length × width × thickness. Convert inches to feet by dividing thickness by 12. One cubic yard equals 27 cubic feet.
How to use the concrete calculator
- Measure the length and width of the pour in feet.
- Measure thickness in inches and use a consistent measurement across the slab.
- Choose a waste allowance for uneven subgrade, spillage, and measurement variation.
Worked example
A 20 ft × 10 ft slab at 4 inches thick has a base volume of about 2.47 cubic yards. A 10% allowance brings the planning quantity to about 2.72 cubic yards. The actual order should account for site shape and supplier ordering increments.
Frequently asked questions
Are the prices current NYC contractor prices?
No. Prices are user-editable examples and are not presented as current market rates or a contractor quote.
Should I order exactly the calculated quantity?
Not without checking site conditions, measurements, product yield, supplier ordering increments, and the shape of the pour. Use the result as a planning estimate.
Can this calculator confirm NYC code compliance?
No. Confirm applicable requirements, permits, inspections, and design details with the relevant authority or a qualified professional.