Concrete Volume & Price Calculator
Volume Required:
0.00 Cubic Yards
With Waste Factor:
0.00 Cubic Yards
Total Estimated Cost:
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Equivalent in 80lb bags:
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How to Calculate Concrete Price per Yard
Calculating the exact amount of concrete needed for a project is crucial to avoid overpaying for excess material or, worse, running out mid-pour. Concrete is typically sold by the cubic yard, which is a volume measurement representing a cube that is 3 feet long, 3 feet wide, and 3 feet deep (27 total cubic feet).
The Mathematical Formula
To find the volume in cubic yards, follow these steps:
- Step 1: Multiply Length (ft) × Width (ft) × Thickness (converted to ft). Since thickness is usually measured in inches, divide the inches by 12.
- Step 2: Take that total (Cubic Feet) and divide by 27 to get Cubic Yards.
- Step 3: Multiply the Cubic Yards by the price per yard quoted by your supplier.
Realistic Example:
If you are pouring a patio that is 20 feet long, 15 feet wide, and 4 inches thick:
1. 20 x 15 x (4/12) = 100 Cubic Feet.
2. 100 / 27 = 3.70 Cubic Yards.
3. At $150 per yard, the cost would be $555 (before tax and delivery fees).
If you are pouring a patio that is 20 feet long, 15 feet wide, and 4 inches thick:
1. 20 x 15 x (4/12) = 100 Cubic Feet.
2. 100 / 27 = 3.70 Cubic Yards.
3. At $150 per yard, the cost would be $555 (before tax and delivery fees).
Why Include a Waste Factor?
In the concrete industry, a 10% waste factor is standard. This accounts for variations in the subgrade (ground that isn't perfectly flat), spillage, or material left in the pump line. It is always better to have a small amount of concrete left over than to fall short by a quarter yard, which would require an expensive "short-load" delivery.
Common Thickness Standards
- Sidewalks and Patios: Typically 4 inches thick.
- Residential Driveways: Usually 4 to 6 inches thick depending on vehicle weight.
- Commercial Pavement: Often 6 to 8 inches or more.
- Footings: Range from 8 to 12 inches depending on local building codes.