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Free Concrete Calculator - Calculate Cubic Yards, Bags & Volume

Professional concrete calculator for contractors, builders, and DIY enthusiasts. Calculate concrete volume and material requirements for slabs, footings, driveways, patios, sidewalks, and cylinders. Get instant, accurate estimates in cubic yards, cubic feet, and cubic meters, plus determine exactly how many 50 lb, 60 lb, or 80 lb concrete bags you'll need for your construction project. Perfect for estimating ready-mix concrete or bagged concrete for any job size.

How to Use This Concrete Calculator

Select your shape type (slab for driveways, patios, foundations, or footings; cylinder for columns, pillars, or piers), enter your dimensions in feet and inches, specify the quantity, and click Calculate. Our professional-grade calculator instantly shows you the concrete volume needed in multiple units and estimates the exact number of concrete bags required for your construction or masonry project. Works for both residential and commercial applications.

Slab
Length
Width
Thickness
Results

Enter dimensions and click Calculate

Professional Tips for Concrete Projects

Standard Slab Thickness

Residential slabs are typically 4 inches thick. Driveways should be 4-6 inches, while garage floors and commercial applications often require 6 inches or more for heavy loads.

Ordering Extra Concrete

Always order 5-10% more concrete than calculated to account for spillage, uneven subgrade, and over-excavation. It's better to have extra than to run short mid-pour.

Bags vs. Ready-Mix

For projects under 1 cubic yard, bagged concrete is cost-effective. For larger projects (1+ cubic yards), ready-mix concrete delivered by truck is more economical and provides better quality.

Concrete Coverage

One 80 lb bag of concrete covers approximately 0.6 cubic feet or 0.022 cubic yards. At 4" thickness, this covers about 2 square feet of area.

Frequently Asked Questions