Concrete Calculator
Calculate how much concrete you need for your project. Get estimates in cubic yards, cubic feet, and number of bags required.
Enter your project dimensions to calculate concrete needed.
How It Works
Our concrete calculator uses simple volume formulas to determine how much concrete your project requires. By multiplying your project's length, width, and depth, we calculate the total volume in cubic feet, then convert to cubic yards (the standard unit for ordering ready-mix concrete).
For small DIY projects, we also calculate how many bags of premixed concrete you'll need. We account for the different bag sizes available at home improvement stores and their coverage rates.
The cost estimate is based on average ready-mix concrete prices of $125-$150 per cubic yard, which includes delivery. Actual prices vary by location and current material costs.
Frequently Asked Questions
How thick should my concrete slab be?
For most residential applications, 4 inches is standard for patios and walkways. Driveways typically require 5-6 inches, while garage floors need at least 6 inches. For heavy equipment or vehicles, consider 8 inches or more.
Should I order extra concrete?
Yes, it's recommended to order 5-10% more concrete than calculated to account for spillage, uneven ground, and form variations. Running short during a pour can compromise the entire project.
When should I use bags vs. ready-mix delivery?
For projects under 1 cubic yard, bags are often more practical and cost-effective. For larger projects, ready-mix delivery is faster, provides consistent quality, and is usually more economical.
How long does concrete take to cure?
Concrete reaches about 70% of its strength in 7 days and full strength in 28 days. You can walk on it after 24-48 hours, but avoid heavy loads for at least a week.
What's the difference between concrete and cement?
Cement is just one ingredient in concrete. Concrete is made by mixing cement with water, sand, and gravel (aggregate). Cement acts as the binding agent that holds everything together.