Concrete Garage Floor Cost Calculator
Enter your garage length, width, slab thickness, and the local installed price per square foot, and this concrete garage floor cost calculator returns the total cost as a low-to-high range — with the cubic yards of concrete shown for reference.
Installed rates typically run $7–$12 per sq ft. The per-square-foot rate already covers concrete, labor, and finishing.
Estimates only — not financial advice. This calculator gives approximate figures for planning. It is not financial, tax, or legal advice; check with a qualified professional before making decisions.
How the concrete garage floor cost calculator works
Garage floors are priced by the square foot installed — that single rate bundles the concrete, forming, rebar or wire mesh, pouring labor, and the smooth-troweled finish garages need. Multiply by the slab area and you have the base cost.
Thickness is shown as cubic yards for reference: a 4-inch slab over 440 sq ft takes about 5.4 cubic yards. Going to 6 inches adds 50% more concrete, which is why heavy-vehicle garages cost noticeably more.
cost = L × W × rate · low = cost × 0.85, high = cost × 1.15 · cu yd = L × W × T/12/27
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Concrete garage floor cost calculator FAQ
How thick should a concrete garage floor be?
4 inches for passenger cars; 5–6 inches if you park heavy trucks, an RV, or a lift. Thicker slabs also want rebar instead of wire mesh — the concrete volume (and cost) rises about 25% per extra inch on a 4-inch base.
How much does a concrete garage floor cost per square foot?
Roughly $7–$12 per square foot installed for a standard 4-inch pour, covering concrete, labor, reinforcement, and finishing. A typical 2-car garage (20 × 22 ft) lands around $3,000–$5,500.
Rebar or wire mesh for a garage floor?
Rebar (#4 bars, 18-inch grid) for heavy loads and thick slabs — it holds position during the pour. Wire mesh suits light-duty 4-inch slabs but gets walked into the subgrade on poorly supervised jobs.
When should control joints be cut in a garage slab?
Cut control joints about one quarter of the slab depth within 6–12 hours of finishing, spaced roughly every 10–12 ft in each direction — they give shrinkage cracks a straight line to follow instead of wandering.
How long before I can park on a new garage floor?
Wait at least 7 days for cars; 28 days for full design strength and heavy loads. Keep it moist (light misting) for the first few days — concrete that dries too fast cures weak.