Concrete Calculator
Calculate the exact amount of concrete you need for your project and estimate the total cost.
Calculator
4 inches
10%
Results
Concrete Needed:
1.36 cubic yardsEstimated Cost:
$169.75How it Works
This concrete calculator helps you estimate the amount of concrete needed for your project, whether you're pouring a patio, driveway, sidewalk, or other flat slab.
How It Calculates
The formula used is: Volume = Length × Width × Depth
The calculator converts all measurements to a common unit (cubic feet), calculates the volume, then converts to cubic yards (the standard unit for ordering concrete). It also applies a waste factor to account for potential spillage, uneven ground, and slight over-ordering, which is a best practice in construction.
Understanding Concrete Measurements
- Concrete is typically ordered in cubic yards (1 cubic yard = 27 cubic feet)
- Standard concrete slab thickness is 4 inches for walkways and patios
- Driveways typically require 5-6 inches thickness
- Structural slabs may need 6-8 inches or more
- Adding a waste factor of 5-10% is standard industry practice
Common Projects
Here are typical concrete requirements for common projects:
- Standard 10' × 10' patio (4" thick): ~1.2 cubic yards
- 2-car driveway 20' × 20' (5" thick): ~6.2 cubic yards
- Sidewalk 4' wide × 20' long (4" thick): ~1 cubic yard