Planning a DIY patio, driveway, or foundation? Our free Concrete Calculator helps you determine exactly how much concrete you need in cubic yards, cubic feet, or cubic meters. It also estimates the number of 60lb or 80lb pre-mix bags required, saving you from buying too much or running out mid-pour.
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Calculate Concrete Volume & Bags Instantly
Accurate concrete calculator for slabs, footings, and columns. Estimate cubic yards and pre-mix bags needed for your construction project.
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1
Select Shape
Choose between Slab (Rectangle), Footing (Square), or Column (Round).
2
Enter Dimensions
Input length, width, and depth (thickness). You can mix units like feet and inches.
3
Check Results
See total volume in cubic yards and estimated bag count.
Key Features
Multiple Shapes
Calculate for rectangular slabs, round columns, and square footings.
Bag Estimator
Instantly see how many 60lb or 80lb bags you need.
Waste Factor
Includes option to add 5-10% for spillage and uneven subgrades.
Frequently Asked Questions
For a 10x10 slab at 4 inches thick, you'd need roughly 1.23 cubic yards, which is about 74 bags of 60lb pre-mix or 56 bags of 80lb mix.
Yes, it's standard practice to order 5-10% extra to account for spillage, uneven ground, and form bowing.
Multiply Length (ft) × Width (ft) × Depth (ft) to get cubic feet, then divide by 27 to get cubic yards.
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