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How many yards of concrete for a 24x24 garage?

By the YardBrick Editorial Team · Last updated October 5, 2026

A 24x24 garage floor at 5 inches thick takes 9.78 cubic yards of concrete with 10% waste added.

Check it with your own numbers

Open the Concrete Calculator with these values

Length	24 ft
Width	24 ft
Thickness	5 in
Extra for waste	10 %
Concrete needed	9.78 yd³
Cubic feet	264 ft³
80 lb bags	440
60 lb bags	587

Floor only

A 24x24 two-car garage is 576 square feet. At 5 inches (0.417 ft) that is 240 cubic feet, or 8.89 yd³. With 10% waste the order comes to 9.78 yd³, or 264 ft³. Round up to 10 yards.

Picking a thickness

We used 5 inches because it is a common middle ground. Here is how the floor-only volume moves with thickness, before waste:

Thickness	Volume
4 in	7.11 yd³
5 in	8.89 yd³
6 in	10.67 yd³

Change the thickness in the calculator to see each one with waste included.

Footings are a separate pour (usually)

In cold climates, a detached garage often sits on a frost wall or a monolithic slab with a turned-down edge. A 96 ft perimeter with a 12x12 inch thickened edge adds about 3.6 yd³. A full frost footing and stem wall is a different calculation entirely and can easily match the floor in volume.

Ordering a 10-yard load

A standard mixer truck carries 9 to 11 yards. One full truck may cover it, but confirm capacity when you book.
Ask about the "hot load" or wait-time charge. Most plants give you 5 to 7 minutes per yard to unload before the clock starts.
Have the truck back as close as possible. A 24 ft slab means the far side is a long rake from the chute.

Layout tips for a two-car floor

Slope the floor toward the overhead door at about 1/8 inch per foot. Plan control joints in a 12x12 grid, which lines up with the center of the garage and the typical parking lanes. Place anchor bolts for the walls within 12 inches of each corner and no more than 6 ft apart before the concrete stiffens.