Cost to Replace Concrete Driveway Calculator

This calculator estimates the cost to replace a concrete driveway based on its area, thickness, and your local concrete price per cubic yard. You enter the driveway length, width, and thickness, plus the price of concrete and a labor/formwork rate, and it returns an estimated total cost, along with the volume of concrete needed and a cost per square foot.

Formula

The total cost is the sum of the material cost and the labor/formwork cost. The material cost is the concrete volume multiplied by the price per cubic yard. The volume of concrete (in cubic yards) is calculated as:

Volume (cu yd) = (Length × Width × Thickness) ÷ 324

Where Length and Width are in feet, and Thickness is in inches. The divisor 324 comes from converting inches to feet (12) and cubic feet to cubic yards (27): 12 × 27 = 324.

Total Cost = (Volume × Concrete Price) + (Length × Width × Labor Rate)

Variables:

• Length (ft): the driveway length
• Width (ft): the driveway width
• Thickness (in): the slab thickness (typical 4–6 inches for residential)
• Concrete Price ($/cu yd): what your supplier charges per cubic yard of delivered concrete
• Labor & Formwork ($/sq ft): cost for site prep, forming, pouring, finishing, and removal of the old driveway

Worked Example

Using the default values: length = 40 ft, width = 10 ft, thickness = 4 in, concrete price = $150 per cu yd, labor = $5 per sq ft.

1. Calculate the volume: (40 × 10 × 4) ÷ 324 = 1600 ÷ 324 = 4.938 cu yd.
2. Material cost: 4.938 × $150 = $740.70.
3. Area: 40 × 10 = 400 sq ft. Labor/formwork: 400 × $5 = $2,000.
4. Total cost: $740.70 + $2,000 = $2,740.70.

The calculator rounds to the nearest dollar, giving $2,741. The cost per square foot is $2,740.70 ÷ 400 = $6.85 (the calculator shows $6.85).

Why Replacement Costs Vary

Concrete driveway replacement costs are rarely uniform. The biggest factors are the size of the driveway, the thickness of the slab, and local labor rates. A typical two-car driveway is about 400–600 square feet, but a single-car driveway might be half that. Thickness matters because a 4-inch slab uses 25% less concrete than a 6-inch slab. Also, the cost of concrete itself fluctuates by region and by the distance from the batch plant. Labor rates vary widely; urban areas with higher costs of living tend to have higher charges per square foot.

Another hidden cost is demolition and removal of the old driveway. Some contractors include this in the labor rate, others charge extra per square foot or per ton of debris. If your existing driveway is reinforced with rebar or wire mesh, removal can be slower and more expensive. Always ask for a breakdown of the quote to see what is included.

How to Use This Calculator

Measure the length and width of your driveway in feet. If the driveway is not a perfect rectangle, break it into rectangular sections and add the areas. For thickness, use the planned thickness of the new slab—4 inches is common for passenger cars, 5–6 inches for heavier vehicles or if you park an RV or truck. For the concrete price, call a local ready-mix supplier and ask for the current price per cubic yard for a standard mix (e.g., 3,000 or 4,000 psi). For labor, get a couple of quotes from contractors or use a typical regional rate. The calculator then gives you a rough total.

Remember that this is an estimate. It does not include permits, reinforcement (rebar or fiber), control joints, sealing, or decorative finishes like stamping or coloring. Those can add 10–50% to the total. Use the result as a planning figure, not a final bid.

Common Mistakes When Estimating

• Mixing units: length in feet, thickness in inches—always convert thickness to feet (divide by 12) before multiplying.
• Forgetting the 27: concrete is sold by the cubic yard, not the cubic foot. Divide cubic feet by 27.
• Underestimating waste: order 5–10% extra concrete to account for spillage and uneven subgrade.
• Ignoring the cost of removing the old slab. This can be $1–$3 per square foot.
• Using a single price per square foot for everything. Material and labor have different drivers.

Also, be aware that concrete prices are quoted per cubic yard, but many contractors quote labor per square foot. This calculator separates the two so you can adjust each independently.

How to Get a More Accurate Quote

Once you have a rough estimate, contact 3–4 local concrete contractors. Give them the same dimensions and thickness. Ask for a written itemized quote that lists excavation, subbase preparation, forming, pouring, finishing, curing, and removal of the old driveway. Check if the quote includes rebar or wire mesh, which is required in many areas for crack control. Also ask about the concrete mix: a higher psi mix costs more but is more durable. If you plan to park heavy vehicles, consider a 5-inch slab with rebar.

Timing matters: concrete work is seasonal in cold climates. Spring and fall are often busy, so prices may be higher. Some contractors offer discounts in winter if the ground isn’t frozen, but that is not guaranteed. Also, be aware that the cheapest quote is not always the best value—check references and insurance.

Alternatives to Full Replacement

If your driveway has minor cracks or surface spalling, you might not need a full replacement. Options include resurfacing with a concrete overlay (about $3–$6 per square foot), crack repair with epoxy or polyurethane, or sealing. However, if the slab has settled, is severely cracked, or the rebar is rusted, replacement is usually the better long-term choice. Another alternative is to pave over the old concrete with asphalt, but that reduces the driveway height and may not be suitable if drainage is an issue. For a cost comparison, use this calculator for replacement and compare it to resurfacing quotes.

Frequently Asked Questions

How much does it cost to replace a 2-car concrete driveway?

For a typical 20×20 ft (400 sq ft) driveway with 4-inch thickness, the material cost is about 4.94 cubic yards. At $150 per yard that is $741. Labor at $5 per sq ft adds $2,000, for a total of around $2,741. With demolition, reinforcement, and other extras, expect $4,000–$7,000 depending on your area.

Should I use 4 or 5 inches of concrete for a driveway?

For standard passenger cars, 4 inches is sufficient if the subgrade is well prepared. For heavier vehicles like trucks or SUVs, 5 inches is recommended. Many contractors use 4 inches for the main slab and 5–6 inches where the driveway meets the garage or where heavy loads are expected.

Does the calculator include the cost of removing the old driveway?

No. The labor rate you enter can include removal if you set it to a higher value, but the calculator does not automatically add it. Removal typically costs $1–$3 per square foot, so you can add that to the labor rate or add it to the total manually.

What is the average cost per square foot for concrete driveway replacement?

Nationally, the average is around $6–$10 per square foot for a basic 4-inch driveway, including labor and materials. This calculator gives you a per-square-foot figure based on your inputs. Premium finishes like stamped or colored concrete can push it to $12–$18 per square foot.

How much concrete do I need for a 40×10 driveway?

At 4 inches thick, you need 4.94 cubic yards. At 5 inches, it is 6.17 cubic yards. Always order 5–10% extra to account for waste and uneven subgrade. For 4 inches, order about 5.5 yards; for 5 inches, about 6.8 yards.

Can I save money by doing it myself?

Yes, but it is physically demanding and risky for large areas. You will save on labor but must rent equipment, buy tools, and handle the concrete quickly. For a 400 sq ft driveway, you would need to place about 5 yards of concrete, which is a lot for a crew of two. Incorrect installation can lead to cracks and premature failure, costing more in the long run. If you do it yourself, use this calculator to estimate materials and get a few quotes for comparison.

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in l | Length | ft | 40 | 0
in w | Width | ft | 10 | 0
in t | Thickness | in | 4 | 0
in p | Concrete price | $/cu yd | 150 | 0
in r | Labor & formwork | $/sq ft | 5 | 0
out cost | Estimated total cost | $ | ((l*w*t/12)/27)*p + l*w*r | 0
out volume | Concrete volume | cu yd | (l*w*t/12)/27 | 2
out per_sqft | Cost per sq ft | $ | ((l*w*t/12)/27)*p/(l*w) + r | 2