A 24x36 garage floor is 864 square feet, the standard three-car pour. It is enough concrete that the details you can wave off on a small slab start to carry real money: the reinforcement, the joint plan, and the volume check all scale up together.
Example rates, worked out
| Finish | Example rate | 24x36 (864 sq ft) |
|---|---|---|
| Standard broom | $9 / sq ft | $7,776 |
| Colored | $12 / sq ft | $10,368 |
Example rates only, your market sets the real one. At 864 square feet a small error in your per-foot rate is a large error in the total, which is the whole argument for pricing off your own costs instead of a chart.
Where the money moves at this size
Reinforcement at the example $1.50 per square foot is $1,296 across the floor, and on a three-car slab that carries daily vehicle traffic it is closer to standard than optional. Thickened edges under the garage walls, if the slab carries them, are their own line.
Then run the volume before you commit: 864 square feet is roughly 10.7 yards at 4 inches and 16 yards at 6. Quoting the thin number and pouring the thick slab is a margin-killer that a thirty-second check catches every time.
Same rates, any garage size
The garage floor concrete calculator opens at 24x36 and reruns for the 22x22 two-car floor, the 24x24 garage slab, or any footprint. The full method is in how to price a concrete slab.
PriceDesk puts your rates on your phone and quotes a job in about ten seconds. Free for 14 days, no card.