Concrete Volume Calculator — Calculate Yards, Feet & Bags

Estimate exact concrete volume in cubic yards, cubic feet, and bag counts (80lb, 60lb) for slabs, cylinders, and footings.

🧱 Concrete Volume Calculator

Lawn/Slab Length (ft)

Slab Width (ft)

Thickness (inches)

Cubic Yards

80lb Bags

60lb Bags

💡 Pro Tip

Always add 10% waste allowance to your calculations. Slabs are rarely perfectly uniform, and some concrete is always lost during the pouring and leveling process.

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Frequently Asked Questions

Q: How do you calculate concrete volume?

For rectangular slabs: Volume = Length (ft) * Width (ft) * Thickness (ft). Divide cubic feet by 27 to get cubic yards.

Q: How many bags of concrete make a cubic yard?

It takes forty-five 80-pound bags or sixty 60-pound bags of concrete mix to make one cubic yard.

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