Concrete Yardage Calculator
How many yards of concrete do you need?
Enter your measurements for a slab, footing, wall, column or circular pour. We will figure the cubic yards, add a waste allowance, and tell you how much to order.
Planning estimate only. Add as many shapes as you need and your total keeps growing. Please read the notice under your result and get a second opinion before you order.
Slab or driveway
Your project total
Add shapes to build your total.
- Shapes added0
- Shape you are entering now0.00 yd³
- Suggested order (rounded up)0.00 yd³
- Cubic feet / cubic meters0 ft³ / 0.00 m³
- Approx. weight0 tons
- Or 80 lb bags of mix0 bags
How to calculate how much concrete you need
Concrete is ordered in cubic yards. One cubic yard is 27 cubic feet, a cube that is 3 feet long, 3 feet wide and 3 feet deep. To find the volume of a flat pour, multiply length by width by thickness, with everything in feet, then divide by 27.
Example: a 20 ft by 20 ft patio that is 4 inches thick. Four inches is 0.333 feet, so 20 × 20 × 0.333 = 133.3 cubic feet. Divide by 27 and you get about 4.94 cubic yards. Add 10 percent for waste and uneven ground and you would order about 5.5 yards.
Typical thickness
- Sidewalks and patios: 4 inches
- Residential driveways: 4 to 6 inches
- Garage floors and heavier slabs: 5 to 6 inches
- Footings: usually 12 to 24 inches wide and 8 to 12 inches deep, set by your plans and local code
Tips for ordering
- Always add 5 to 10 percent extra. Subgrade is never perfectly level, forms bulge slightly and some concrete stays in the truck and hose.
- Short on concrete is worse than a little left over. A second delivery can mean a cold joint.
- Many ready-mix suppliers add a short-load fee for small orders, so ask before you order.
- If access is tight, the slope is steep or the pour is far from the street, a concrete line pump can place the concrete exactly where you need it.
Credentials you can verify
Schedule a pump truck for your next pour
Tell us how many yards and where the pour is, and our dispatch team will confirm a date.
707-538-1206