How many cubic yards of concrete do I need for a 2-car driveway?

A standard 2-car driveway measuring 20 × 20 ft at 5 inches thick requires 6.17 cubic yards of concrete. At 6 inches thick, you need 7.41 cubic yards. Always add 10% waste, bringing the order to approximately 6.8–8.2 cubic yards.

How much does a concrete driveway cost?

A concrete driveway costs $4–$10 per square foot installed (2025 prices), including labor, materials, forming, and finishing. For a 20×20 ft driveway (400 sq ft), expect to pay $1,600–$4,000. Plain gray concrete is at the lower end. Stamped, colored, or decorative concrete runs $12–$20 per square foot. Ready-mix concrete alone costs $125–$175 per cubic yard.

What PSI concrete should I use for a driveway?

Use 4,000 PSI concrete for residential driveways. In regions with freeze-thaw cycles, specify air-entrained concrete with 5–7% air content for added frost resistance. For driveways that will support heavy trucks or RVs, consider 4,500–5,000 PSI for extra durability.

How long does a concrete driveway take to cure?

You can walk on a concrete driveway after 24–48 hours. Do not drive on it for at least 7 days under normal conditions (above 50°F). The concrete reaches full design strength at 28 days. In cold weather (below 50°F), curing takes longer — protect the slab with insulating blankets and avoid driving on it for 10–14 days.

Do I need rebar in a concrete driveway?

Yes, reinforcement is strongly recommended for concrete driveways. The standard options are: #3 or #4 rebar on 18-inch centers in a grid pattern, or 6×6 welded wire mesh (WWM). Rebar doesn't prevent cracking, but it holds cracks together and maintains load transfer across any cracks that form. Most local building codes require reinforcement for driveways.

How many bags of concrete do I need for a driveway?

For most driveways, ready-mix concrete from a batch plant is more practical and economical than bags. However, for small sections or repairs: a 10×10 ft area at 5 inches thick needs about 1.54 yd³, or 70 bags of 80 lb concrete. A full 20×20 ft driveway at 5 inches thick would require approximately 278 bags — at which point ready-mix is strongly recommended.

What is the standard concrete driveway size?

Standard driveway sizes are: single-car driveway: 9–12 ft wide × 18–20 ft long; 2-car driveway: 18–24 ft wide × 20 ft long; 3-car driveway: 27–36 ft wide × 20 ft long. Aprons and turnarounds add to the total area. The most common residential 2-car driveway is 20 × 20 ft, totaling 400 square feet.

How do I calculate concrete for an L-shaped or circular driveway?

For irregular-shaped driveways, break the shape into simple rectangles and calculate each section separately, then add the volumes together. For a circular turnaround, use the formula: π × radius² × thickness (all in feet). Add all sections together, then add 10% for waste. Our calculator handles rectangular sections — for complex shapes, calculate each rectangle individually and sum the results.

How do I prepare the ground for a concrete driveway?

Proper subbase preparation is critical for a long-lasting driveway. Remove all vegetation, organic material, and soft soil. Compact the native subgrade to at least 95% Proctor density. Add 4–6 inches of compacted gravel base (crushed stone or road base) for drainage and stability. Set forms at the correct grade and slope (1/8 to 1/4 inch per foot away from the house). Install vapor barrier on concrete-on-grade slabs in humid climates.

When should I saw-cut control joints in a concrete driveway?

Saw-cut control joints within 6–12 hours after the final concrete finish, before the concrete gets too hard. Joints should be spaced every 8–12 feet in both directions (for a 20 ft driveway, cut every 10 ft). Joint depth should be ¼ of the slab thickness — for a 5-inch slab, cut joints at least 1.25 inches deep. Control joints guide where cracking occurs so cracks happen in a straight line rather than randomly.

How long should I wait before sealing a concrete driveway?

Wait at least 28 days before applying a sealer to a new concrete driveway — this allows the concrete to fully cure and carbonate. Applying sealer too early can trap moisture and cause surface scaling. After the initial 28-day cure, reseal the driveway every 2–3 years to protect against oil stains, freeze-thaw damage, and deicing salt.

What is the best concrete mix for a driveway?

The best concrete mix for a residential driveway is 4,000 PSI with a water-cement ratio of 0.45 or lower. In freeze-thaw climates, specify Type I/II cement with 5–7% air entrainment. A standard mix design is approximately 1 part cement : 2 parts sand : 3 parts aggregate (1:2:3 by volume). Avoid adding extra water at the job site — each additional gallon per cubic yard reduces strength by about 200 PSI.

Can I pour a concrete driveway in cold weather?

Do not pour concrete when air or ground temperatures are below 40°F (4°C). Fresh concrete can freeze before it gains adequate strength, permanently damaging the slab. In cold weather (40–60°F), use heated water, warm aggregates, or Type III high-early-strength cement to speed up curing. Cover the freshly poured slab with insulating blankets for at least 7 days. Never pour on frozen ground.

How is concrete driveway thickness measured?

Concrete driveway thickness is measured in inches and refers to the vertical depth of the concrete slab at its thinnest point. It does not include the gravel subbase beneath. When setting forms, measure the distance from the top of the form board to the compacted subbase. A 5-inch thick slab means the concrete itself is 5 inches deep, with a 4–6 inch gravel base beneath it.

Should I use fiber mesh or rebar in my concrete driveway?

Both are beneficial, and you can use them together. Rebar (steel reinforcement bars) provides structural strength and holds cracks together after they form — it's the primary structural reinforcement. Fiber mesh (polypropylene or steel fibers mixed into the concrete) reduces plastic shrinkage cracking during curing and adds impact resistance, but does not replace rebar for structural reinforcement. For best results, use both: rebar for structural integrity and fiber mesh to reduce early cracking.

How much slope does a concrete driveway need?

A concrete driveway should have a minimum slope of 1% (1/8 inch per foot) to ensure proper drainage. The maximum recommended slope is 14% (about 8 degrees) for comfortable driving. Ideal driveway slope is 2–5%. The slab should slope away from your garage and house to direct water runoff toward the street or a drainage channel. Never slope a driveway toward a structure.

How many square feet does a cubic yard of concrete cover?

One cubic yard of concrete covers the following areas depending on thickness: at 4 inches thick: 81 square feet; at 5 inches thick: 65 square feet; at 6 inches thick: 54 square feet. To find how many cubic yards you need, divide your total square footage by these coverage figures. For a 400 sq ft driveway at 5 inches thick: 400 ÷ 65 = 6.15 cubic yards (before waste factor).

How long does a concrete driveway last?

A properly installed concrete driveway lasts 30–50 years with regular maintenance. Key factors that affect lifespan include: concrete mix quality (use 4,000 PSI minimum), proper thickness (5–6 inches), adequate subbase preparation, control joints to manage cracking, sealing every 2–3 years, and avoiding harsh deicing chemicals like rock salt in the first 1–2 years. Concrete significantly outlasts asphalt (15–25 years) and pavers (20–30 years with maintenance).

Concrete Driveway Calculator – Cubic Yards, Bags & Cost (Free)

Concrete Driveway Calculator

Q: How much concrete do I need for a driveway?

The amount of concrete you need depends on your driveway's length, width, and thickness. For a standard 2-car driveway (20 ft × 20 ft) at 5 inches thick, you need approximately 6.17 cubic yards. Use the formula: (Length × Width × Thickness in inches ÷ 12) ÷ 27 = cubic yards. Always add 10% for waste.

Q: How thick should a concrete driveway be?

A residential concrete driveway should be a minimum of 4 inches thick, but 5–6 inches is the recommended standard. Use 4 inches for light passenger vehicles only. Use 5 inches for standard residential driveways with regular car and SUV traffic. Use 6 inches for driveways that will support trucks, RVs, heavy equipment, or frequent heavy loads.

Enter your driveway dimensions to instantly get cubic yards, cubic feet, and the exact number of bags you need — plus cost estimates and pro tips.

✓ Engineer-Verified Formulas ✓ Imperial & Metric ✓ Instant Results ✓ 100% Free

🏗️ Concrete Driveway Calculator

Driveway Length (ft)

Driveway Width (ft)

Concrete Thickness (in)

Ready-Mix Price per yd³ (optional)

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Cubic Yards (yd³)

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Cubic Feet (ft³)

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Cubic Meters (m³)

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Est. Material Cost

Results include 10% waste factor — recommended for all pours.

Bags Needed (with 10% waste):

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40 lb Bags

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60 lb Bags

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80 lb Bags

How Much Concrete Do I Need for a Driveway?

The amount of concrete you need for a driveway depends on three things: length, width, and thickness. The standard formula is:

Concrete Volume Formula:
(Length × Width × Thickness in inches ÷ 12) ÷ 27 = Cubic Yards

Example: 20 ft × 10 ft × 5 in thick = 3.09 yd³ (before waste factor)

For residential driveways, the recommended concrete thickness is 5 inches for standard passenger vehicles and 6 inches for trucks, RVs, or heavy loads. Never go below 4 inches for a driveway — thinner slabs crack prematurely under vehicle loads.

Always order 5–10% more concrete than your calculated volume to account for spillage, subgrade irregularities, and over-excavation. Running short on pour day means stopping mid-slab — and cold joints in the concrete are a serious structural weakness.

Concrete Driveway Size Chart — Cubic Yards Needed

Use this quick-reference chart for the most common residential driveway sizes. All figures include a 10% waste factor and are shown at both 5″ and 6″ thickness.

Concrete needed by driveway size (with 10% waste factor)
Driveway Size	Sq Ft	At 4″ thick	At 5″ thick	At 6″ thick	Car Capacity
9 × 18 ft	162	2.22 yd³	2.77 yd³	3.33 yd³	1 car
10 × 20 ft	200	2.74 yd³	3.43 yd³	4.12 yd³	1 car
12 × 20 ft	240	3.26 yd³	4.07 yd³	4.89 yd³	1 car wide
16 × 20 ft	320	4.35 yd³	5.44 yd³	6.52 yd³	2 cars
20 × 20 ft	400	5.44 yd³	6.79 yd³	8.15 yd³	2 cars
24 × 20 ft	480	6.52 yd³	8.15 yd³	9.78 yd³	2–3 cars
30 × 20 ft	600	8.15 yd³	10.19 yd³	12.22 yd³	3 cars
30 × 30 ft	900	12.22 yd³	15.28 yd³	18.33 yd³	3+ cars

Highlighted rows = most common 2-car driveway sizes in the US. All figures include 10% waste factor.

How Thick Should a Concrete Driveway Be?

Thickness is the single most important factor in driveway longevity. Too thin and the slab cracks; too thick and you waste money. Here’s the breakdown by vehicle type:

Thickness	Best For	PSI Required	Notes
4 inches	Light passenger cars only, mild climate	3,500 PSI	Minimum code in most areas — not recommended for long-term use
5 inches	Standard residential driveways	4,000 PSI	Recommended for most homeowners — good balance of strength and cost
6 inches	Trucks, SUVs, pickup trucks, RVs	4,000 PSI	Best long-term choice; handles heavier loads and freeze-thaw cycles better
7–8 inches	Heavy equipment, commercial vehicles	4,500+ PSI	Required for forklifts, delivery trucks, heavy machinery access

⚠️ Never go below 4 inches for a vehicle driveway. Anything thinner will crack under vehicle loads, especially at the edges where thickness is hardest to control. If your soil is soft or expansive clay, increase thickness by 1–2 inches and add a compacted gravel subbase.

How to Calculate Concrete for a Driveway — Step by Step

Here’s exactly how the calculation works, with a real example of a 20 × 10 ft driveway at 5 inches thick:

Measure your driveway dimensions

Measure length and width in feet. For our example: 20 ft long × 10 ft wide. For irregular shapes, break into rectangles and calculate each separately.

Convert thickness from inches to feet

Divide thickness by 12: 5 inches ÷ 12 = 0.4167 ft

Calculate cubic feet

Length × Width × Thickness: 20 × 10 × 0.4167 = 83.33 ft³

Convert to cubic yards

Divide by 27: 83.33 ÷ 27 = 3.09 yd³

Add the 10% waste factor

Multiply by 1.10: 3.09 × 1.10 = 3.40 yd³. This is your order quantity.

Order ready-mix or calculate bags

At 3.40 yd³, order ready-mix concrete from a local batch plant. If using bags: 3.40 × 45 = 153 bags of 80 lb concrete.

Bags vs. Ready-Mix Concrete: Which to Use for a Driveway?

For most driveways, ready-mix concrete is the right choice. Here’s why — and when bags make sense:

Factor	Bagged Concrete	Ready-Mix Concrete
Project size	Under 1 yd³ (small repairs)	Any size — ideal over 1 yd³
Cost per yd³	$180–$250 (materials only)	$125–$175 delivered
Labor	Very high — mix each bag	Low — just place and finish
Quality control	Variable — depends on mixing	Consistent plant-batched mix
Cold joints risk	High — batch-to-batch gaps	Low — continuous pour
Minimum order	Any quantity	Usually 1 yd³ minimum

Rule of thumb: If your driveway calculation comes out to more than 1 cubic yard, order ready-mix. A standard 20×20 ft driveway at 5 inches thick needs 6+ cubic yards — that’s 270+ bags of 80 lb concrete that you’d have to manually mix. Ready-mix is faster, cheaper, and produces a stronger, more uniform slab.

Concrete Driveway Cost Estimate (2025)

Concrete driveway costs vary based on size, thickness, finish type, and region. Here are the typical installed costs including labor, materials, forming, and finishing:

Driveway Size	Sq Ft	Plain Concrete	Stamped / Decorative
10 × 20 ft (1 car)	200	$800 – $2,000	$2,400 – $4,000
16 × 20 ft (2 car)	320	$1,280 – $3,200	$3,840 – $6,400
20 × 20 ft (2 car)	400	$1,600 – $4,000	$4,800 – $8,000
24 × 20 ft (2–3 car)	480	$1,920 – $4,800	$5,760 – $9,600
30 × 30 ft (3+ car)	900	$3,600 – $9,000	$10,800 – $18,000

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Material Only

Ready-mix: $125–$175/yd³. Includes concrete delivery. Does not include rebar, forming, or labor.

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Labor

$2–$5 per sq ft for standard pour and finish. Decorative finishes add $5–$10/sq ft extra.

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Regional Variation

Prices are highest in the Northeast and West Coast. Midwest and South tend to be 15–25% lower.

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Extras to Budget

Demo of old driveway: $1–$2/sq ft. Pump truck if needed: $300–$600 extra.

How to Prepare the Ground for a Concrete Driveway

A concrete driveway is only as good as what’s underneath it. Poor subbase preparation is the number one cause of premature driveway cracking and slab settlement.

Remove all vegetation and organic material — tree roots, grass, and topsoil compress over time and cause the slab to settle unevenly.
Excavate to the proper depth — for a 5″ slab with 4″ gravel base, excavate 9 inches below finished grade.
Compact the subgrade — use a plate compactor to achieve at least 95% Proctor density. Soft or loose soil must be removed and replaced.
Install a 4–6 inch compacted gravel base — use crushed stone or road base gravel, compacted in layers. This provides drainage and load distribution.
Set forms at the correct grade — slope the driveway 1/8″ to 1/4″ per foot away from your house for drainage. Never slope toward the structure.
Install reinforcement — place #4 rebar on 18″ centers or 6×6 WWM. Keep reinforcement at mid-slab depth using chairs or supports.

Best Concrete Mix for a Driveway

Not all concrete is the same. Choosing the right mix design is critical for a driveway that lasts 30–50 years.

Climate	Recommended PSI	Air Entrainment	W/C Ratio
Warm / no freeze-thaw	3,500–4,000 PSI	Not required	≤ 0.50
Moderate freeze-thaw (most of US)	4,000 PSI	5–7% air content	≤ 0.45
Severe freeze-thaw (Northern US, Canada)	4,000–4,500 PSI	6–7% air content	≤ 0.40
Heavy traffic / trucks	4,500–5,000 PSI	Optional	≤ 0.40

⚠️ Never add extra water at the job site. Each additional gallon of water per cubic yard reduces concrete strength by approximately 200 PSI and increases shrinkage cracking. Specify the proper slump (3–5 inches for driveways) when ordering ready-mix and stick to it.

Concrete Driveway Curing Time

Time After Pour	Activity Allowed	% Strength Gained
24–48 hours	Walk on surface carefully	~20%
3 days	Remove forms	~40%
7 days	Light vehicle traffic (passenger cars)	~70%
14 days	Standard vehicle traffic	~85%
28 days	Full design strength — all vehicles and loads	100%

Keep the slab moist for the first 7 days using wet burlap, plastic sheeting, or a curing compound. Proper moisture curing dramatically improves final strength — dry curing in hot weather can reduce strength by 30–40%.

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Frequently Asked Questions — Concrete Driveway Calculator

The 20 most asked questions about concrete driveways, answered with specific numbers and practical guidance.