How to Calculate Concrete Volume
Concrete volume is calculated by multiplying length, width, and thickness.
Volume = Length × Width × Thickness
Example
A slab that is 20 feet long, 10 feet wide, and 4 inches thick requires approximately 66.7 cubic feet of concrete, or about 2.47 cubic yards.
Concrete Volume Units
- Cubic feet (ft³) for smaller projects
- Cubic yards (yd³) commonly used for ordering concrete
- Cubic meters (m³) used in metric countries
Tips for Ordering Concrete
Add a small extra allowance for waste, uneven ground, and measurement differences. Many contractors order around 5% to 10% extra depending on the project.
FAQ
How do I calculate concrete volume?
Multiply length by width by thickness, then convert the result into your preferred unit.
How many cubic yards of concrete do I need?
Divide cubic feet by 27 to convert cubic feet into cubic yards.
Should I order extra concrete?
Yes. A small extra amount helps avoid shortages during installation.
Related Calculators
Concrete Slab Calculator · Concrete Cost Calculator · Cement Calculator