Concrete Patio Cost Calculator
Estimate total cost for a poured concrete patio including excavation, base, labor, and finishing.
Formula
Volume (cu yd) = (L x W x T/12) / 27; Total Cost = Concrete + Labor + Excavation + Base + Forms + Rebar + Finishing
Where L = length in feet, W = width in feet, T = thickness in inches. Volume is converted from cubic feet to cubic yards by dividing by 27. A 10% waste factor is applied to the concrete volume. Each cost component is calculated separately based on area or linear footage.
Worked Examples
Example 1: Standard 20x12 Broom Finish Patio
Problem: Calculate the total cost for a 20 ft by 12 ft patio that is 4 inches thick with broom finish. Concrete costs $140/yd3 and labor is $8/sqft.
Solution: Area = 20 x 12 = 240 sq ft\nVolume = 240 x (4/12) = 80 cu ft = 2.96 cu yd\nWith 10% waste = 3.26 cu yd\nConcrete: 3.26 x $140 = $456\nLabor: 240 x $8 = $1,920\nExcavation: 240 x $2.50 = $600\nBase: 240 x $1.50 = $360\nForms: 64 lf x $3 = $192\nRebar: 240 x $0.75 = $180\nFinishing: 240 x $1.50 = $360\nTotal = $4,068
Result: Total Cost: $4,068 | Cost Per Sq Ft: $16.95 | Concrete Needed: 3.26 cu yd
Example 2: Large Stamped Concrete Patio
Problem: Estimate the cost for a 30 ft by 15 ft stamped concrete patio, 4 inches thick, at $140/yd3 concrete and $8/sqft labor.
Solution: Area = 30 x 15 = 450 sq ft\nVolume = 450 x (4/12) = 150 cu ft = 5.56 cu yd\nWith 10% waste = 6.11 cu yd\nConcrete: 6.11 x $140 = $856\nLabor: 450 x $8 = $3,600\nExcavation: 450 x $2.50 = $1,125\nBase: 450 x $1.50 = $675\nForms: 90 lf x $3 = $270\nRebar: 450 x $0.75 = $338\nFinishing (stamped 2.5x): 450 x $1.50 x 2.5 = $1,688\nTotal = $8,551
Result: Total Cost: $8,551 | Cost Per Sq Ft: $19.00 | Concrete Needed: 6.11 cu yd
Frequently Asked Questions
How much does a concrete patio cost per square foot?
A basic broom-finished concrete patio typically costs between $8 and $15 per square foot installed, depending on your region and local labor rates. Stamped or decorative concrete can push that range up to $18 to $28 per square foot because the finishing process requires specialized tools and skilled labor. The total per-square-foot cost includes excavation, gravel base, formwork, concrete material, reinforcement, and finishing labor. Urban areas with higher wages tend to be at the top of these ranges, while rural areas may fall below the average. Getting multiple quotes from local contractors is the best way to determine pricing in your specific market.
How thick should a concrete patio be?
A standard residential concrete patio should be 4 inches thick, which is the industry recommendation from the American Concrete Institute for pedestrian-traffic slabs. If you plan to place heavy items such as hot tubs, large planters, or outdoor kitchen islands on the patio, you should increase the thickness to 5 or 6 inches in those areas. The sub-base beneath the slab should be at least 4 inches of compacted gravel to ensure proper drainage and prevent settling. Thicker slabs use significantly more concrete, so upgrading from 4 to 6 inches increases material volume by 50 percent. Always consult local building codes, as frost-prone regions may require deeper footings or thickened edges.
Do I need rebar or wire mesh in a patio slab?
Reinforcement is strongly recommended for any concrete patio to control cracking and improve structural integrity over time. Welded wire mesh (6x6 W1.4/W1.4) is the most common choice for standard 4-inch patios because it distributes tension loads across the slab. For larger patios exceeding 200 square feet, number 3 or number 4 rebar spaced on 18-inch centers provides superior crack resistance. Fiber-mesh additives mixed into the concrete can supplement but generally should not replace steel reinforcement for outdoor slabs. The cost of reinforcement typically adds only $0.50 to $1.50 per square foot, which is a small price compared to the expense of repairing a cracked, unreinforced slab later.
What type of concrete finish is best for a patio?
Broom finish is the most popular and cost-effective choice because it provides excellent slip resistance and is easy for any contractor to apply. Stamped concrete mimics the look of natural stone, brick, or tile at a fraction of the cost, but it requires a skilled installer and typically adds $6 to $12 per square foot to the total price. Exposed aggregate finishes reveal the natural stone within the concrete mix, creating an attractive textured surface that hides minor imperfections and provides good traction. Colored concrete uses integral pigments or surface-applied stains to match your home exterior. Polished concrete delivers a sleek modern look but requires sealing and may become slippery when wet, making it less ideal for pool-adjacent patios.
How long does it take for a patio slab to cure?
Concrete reaches its initial set within 24 to 48 hours, at which point you can walk on the surface carefully without leaving marks. However, the slab does not reach its design strength of approximately 4,000 PSI until after 28 days of proper curing. During the first 7 days, you should keep the surface moist by covering it with plastic sheeting or spraying it with a curing compound to prevent premature drying. Placing furniture or heavy loads on the patio before the 28-day mark can cause surface damage or structural cracking. Temperature matters significantly as well, because concrete cured below 50 degrees Fahrenheit gains strength much more slowly, while temperatures above 90 degrees can cause rapid moisture loss and surface cracking.
How much waste factor should I add when ordering concrete?
Industry practice recommends adding 10 percent extra concrete beyond the calculated volume to account for waste, spillage, uneven subgrade, and slight variations in slab thickness. For irregularly shaped patios or patios with curves, you should increase the waste factor to 15 percent because the formwork creates more opportunities for volume discrepancies. Ready-mix concrete trucks typically deliver in half-yard increments, so you should round up to the nearest half yard after applying your waste factor. Running short on concrete during a pour is far worse than having a small amount left over, as cold joints from a delayed second load weaken the slab. Some concrete suppliers charge short-load fees for orders under a certain minimum, usually 3 to 5 cubic yards, which can affect your cost calculations.