How many cubic yards is a standard 60 lb bag of concrete?

A 60 lb bag yields about 0.45 cubic feet (0.017 cubic yards). An 80 lb bag yields about 0.60 cubic feet (0.022 cubic yards).

When should I use ready-mix concrete vs. bags?

For projects over 1–2 cubic yards, ready-mix concrete from a truck is more cost-effective and delivers better consistency than mixing bags yourself.

Concrete Calculator

Enter slab dimensions to find cubic yards and number of concrete bags needed.

Calculate the volume of concrete needed for a slab or footing. Enter the length, width, and depth in inches to get cubic feet, cubic yards, cubic meters, and the exact number of 60 lb and 80 lb bags needed.

Last reviewed: April 2026Report an error

Length (ft)

Width (ft)

Depth (inches)

Cubic Yards

1.235 yd³

A 10×10 ft slab at 4" deep = 33.33 cu ft (1.235 cu yd). You need 56 bags of 80 lb concrete or 75 bags of 60 lb.

Cubic Feet

33.33

Cubic Yards

1.235

80 lb Bags

60 lb Bags

How to Use This Concrete Calculator

Enter slab length and width in feet.
Enter slab depth/thickness in inches (standard residential slab: 4 inches).
Read cubic feet, cubic yards, and bag counts.
For large projects (>1 cubic yard), order ready-mix concrete instead of bags.

Frequently Asked Questions

: A 60 lb bag yields about 0.45 cubic feet (0.017 cubic yards). An 80 lb bag yields about 0.60 cubic feet (0.022 cubic yards).
: For projects over 1–2 cubic yards, ready-mix concrete from a truck is more cost-effective and delivers better consistency than mixing bags yourself.

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