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Concrete, base, steel, labour and finish priced to the square foot, with a real range.
Common US slabs at 4 in with a 4 in gravel base and 5% waste.
Tap a preset in the calculator above to load a typical job, then adjust the numbers to match your site.
Starting points: 10 × 10 ft patio · 20 × 20 ft slab · 20 × 24 ft driveway, 5 in · 24 × 24 ft garage, 6 in · 12 × 40 ft RV pad, 6 in
See installed concrete prices, permits and base prep rules by city.
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Measure the slab, set the thickness from its load, then check the base and finish.
Plan on $6.50 to $10.50 per square foot installed for a plain slab, so a 400 sq ft slab at 4 inches runs about $2,600 to $4,200. Decorative and stamped finishes push the rate to $18 per square foot and up.
Length times width times thickness in feet, divided by 27. A 20 × 20 ft slab at 4 inches is about 4.9 cubic yards, and 5% waste brings it to 5.2.
Ready-mix above about 1 cubic yard. One yard equals roughly 45 bags of 80 lb mix, and bags cost about 60% more plus your mixing time.
$50 to $150, or about $53 per yard, when the order is under the supplier minimum of about 4 cubic yards. It is the most common surprise on small pours.
Five inches is the practical minimum for cars, and 6 inches for RVs, trucks or poor soil. Thickness matters more than strength class for residential work.
Most cities require a permit for flatwork over a small threshold or anything attached to a structure, typically $50 to $200 plus inspection.
Using the calculator defaults, 10 × 10 ft patio gives Concrete needed: 1.3 and Typical installed: $1,129, with a typical range $853 to $1,404. Change the waste allowance, material or thickness to match your site.
Using the calculator defaults, 12 × 40 ft rv pad, 6 in gives Concrete needed: 9.3 and Typical installed: $4,919, with a typical range $3,543 to $6,295. Change the waste allowance, material or thickness to match your site.