Calculate Concrete for Your Driveway
Select your driveway shape, enter dimensions, and get the exact amount of concrete needed -- in cubic yards, bag counts, and estimated cost.
For a full circle driveway, set inner radius to 0. For a ring-shaped turnaround, enter both outer and inner radii.
Recommended Driveway Thickness
Choosing the right thickness depends on the expected load. Thicker concrete prevents cracking under heavy vehicles and extends the life of your driveway.
| Use / Vehicle Type | Recommended Thickness | PSI Rating |
|---|---|---|
| Passenger cars only | 4 inches | 3,000 PSI |
| Light trucks and SUVs | 4-5 inches | 3,500 PSI |
| Heavy trucks / RVs / trailers | 5-6 inches | 4,000 PSI |
| Commercial / delivery trucks | 6-8 inches | 4,000-4,500 PSI |
| Apron (street to sidewalk) | 6-8 inches | 4,000 PSI |
Thickness Matters
Every additional inch of thickness significantly increases load capacity. A 5-inch driveway is roughly 50% stronger than a 4-inch driveway in terms of load-bearing capacity. If in doubt, go thicker -- the extra concrete cost is small compared to the cost of replacing a cracked driveway.
How Driveway Concrete Volume Is Calculated
Rectangular Driveway
Convert cubic feet to cubic yards by dividing by 27. For example, a 20 ft × 12 ft driveway at 4 inches thick: 20 × 12 × (4/12) = 80 ft³ = 2.96 yd³.
Circular Driveway (Ring)
For a full circle driveway, the inner radius is 0. For a ring-shaped turnaround, subtract the inner circle area from the outer circle area before multiplying by thickness.
Waste Factor
A 10% waste factor is standard for driveway pours. Concrete is lost to spillage, uneven subgrade, form movement, and finishing. For first-time DIY pours, consider adding 15% waste to be safe.
Concrete Driveway Guide
Site Preparation
- Excavate: Remove 8-12 inches of soil to accommodate the gravel base and concrete thickness.
- Gravel base: Compact 4-6 inches of crushed gravel or road base. This provides drainage and prevents settling.
- Forms: Use 2x4 or 2x6 lumber staked every 2-3 feet. Ensure forms are level or have proper slope for drainage (1/8 inch per foot minimum).
- Reinforcement: Use #4 rebar on 18-inch centers or 6x6 welded wire mesh. Support it on chairs to keep it in the lower third of the slab.
Pouring and Finishing
- Pour sequence: Start at the far end and work toward the truck. Spread concrete evenly with shovels and rakes.
- Screeding: Use a straight 2x4 to level the concrete across the forms. Make multiple passes.
- Bull float: After screeding, smooth the surface with a bull float to push down aggregate and bring paste to the surface.
- Control joints: Cut control joints every 8-12 feet (or at intervals no more than 2-3 times the slab thickness in feet). These prevent random cracking.
- Broom finish: After the sheen of bleed water disappears, drag a broom across the surface for traction.
- Edging: Run an edging tool along all form edges for a clean, rounded edge that resists chipping.
Curing for Maximum Strength
- 24 hours: Initial set. Keep all traffic off the concrete.
- 48 hours: Can support light foot traffic.
- 7 days: Reaches ~70% of design strength. Remove forms. Light vehicles are usually safe.
- 10 days: Most contractors allow normal vehicle traffic.
- 28 days: Full design strength (typically 3,000-4,000 PSI for residential driveways).
Keep the concrete moist for at least 7 days. Use a curing compound, wet burlap, or plastic sheeting. In hot weather (above 85 F), mist the surface several times per day.
Common Driveway Sizes
| Driveway Type | Typical Size | Thickness | Approx. Concrete |
|---|---|---|---|
| Single car | 10' x 20' | 4" | 2.5 yd³ |
| Single car (long) | 10' x 40' | 4" | 4.9 yd³ |
| Two car | 20' x 20' | 5" | 6.2 yd³ |
| Two car (long) | 20' x 40' | 5" | 12.3 yd³ |
| Circular turnaround | 20' outer, 10' inner | 4" | 11.6 yd³ |
| RV pad | 14' x 45' | 6" | 11.7 yd³ |
Temperature and Weather
- Ideal conditions: 50-75 F (10-24 C), overcast, low wind.
- Too cold (below 40 F): Concrete cures slowly and can freeze before setting. Use insulating blankets and hot water in the mix.
- Too hot (above 90 F): Concrete sets too fast, increasing crack risk. Pour in early morning, use cold water, and have extra help for rapid finishing.
- Rain: Do not pour if rain is expected within 4-6 hours. Rain on fresh concrete washes away cement paste and weakens the surface.
Frequently Asked Questions
How much concrete do I need for a driveway?
The amount depends on your driveway dimensions and thickness. A standard single-car driveway (10 ft x 20 ft) at 4 inches thick requires about 2.5 cubic yards. A two-car driveway (20 ft x 20 ft) at 5 inches thick requires about 6.2 cubic yards. Always add at least 10% for waste to avoid running short mid-pour.
How thick should a concrete driveway be?
A minimum of 4 inches is standard for passenger cars. If trucks, SUVs, or heavy vehicles will use the driveway regularly, increase to 5-6 inches. The apron section where the driveway meets the street should be 6-8 inches thick due to the extra stress from vehicles transitioning between surfaces.
How much does a concrete driveway cost?
Ready-mix concrete typically costs $125-$175 per cubic yard delivered. A two-car driveway (20 x 20 ft, 5 inches thick) needs about 6.2 cubic yards, costing roughly $930-$1,085 for concrete alone. Total installed cost including excavation, gravel base, forms, reinforcement, labor, and finishing ranges from $8-$15 per square foot, or $3,200-$6,000 for a 400 sq ft driveway.
How many bags of concrete for a driveway?
One cubic yard requires about 45 bags of 80 lb concrete or 60 bags of 60 lb concrete. A 2.5 cubic yard single-car driveway needs approximately 113 bags of 80 lb mix. Bagged concrete is only practical for small repairs or pads under 1 cubic yard. For an actual driveway, ready-mix truck delivery is strongly recommended.
How long does a concrete driveway take to cure?
Initial set occurs in 24-48 hours -- keep all traffic off during this time. Light foot traffic is safe after 48 hours. Most contractors allow vehicle traffic after 7-10 days when the concrete has reached about 70% of its design strength. Full cure takes 28 days, reaching 3,000-4,000 PSI. Avoid parking heavy vehicles for at least 10 days.
Can I pour a concrete driveway myself?
Small driveways are possible as a DIY project if you have experience with concrete work and enough helpers. You need proper formwork, a compacted gravel base, reinforcement, and the ability to finish the concrete before it sets (typically 60-90 minutes in moderate weather). For driveways over 200 square feet or requiring more than 2 cubic yards, hiring a professional crew is strongly recommended.
What is the best finish for a concrete driveway?
A broom finish is the most common and practical choice. It provides excellent traction in wet weather and is easy to apply. Other options include exposed aggregate (decorative with natural stone texture), stamped concrete (mimics brick, stone, or tile patterns), and colored concrete. Avoid smooth trowel finishes on driveways as they become dangerously slippery when wet.
Does this calculator store my data?
No. All calculations run entirely in your browser. No data is sent to any server, and nothing is stored.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are estimates and may vary based on actual conditions.
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Concrete Driveway Calculator FAQ
How much concrete do I need for a driveway?
The amount depends on your driveway dimensions and thickness. A standard single-car driveway (10 ft x 20 ft) at 4 inches thick requires about 2.5 cubic yards. A two-car driveway (20 ft x 20 ft) at 5 inches thick requires about 6.2 cubic yards. Always add 10% for waste.
How thick should a concrete driveway be?
A standard residential driveway for passenger cars should be 4 inches thick. If the driveway will support heavier vehicles like trucks or RVs, increase to 5-6 inches. Commercial driveways or those with frequent heavy truck traffic should be 6-8 inches thick.
How much does a concrete driveway cost?
Ready-mix concrete costs $125-$175 per cubic yard delivered. A typical two-car driveway (20 x 20 ft, 5 inches thick) needs about 6.2 cubic yards, costing $775-$1,085 for concrete alone. Total installed cost including labor, grading, and finishing typically ranges from $8-$15 per square foot.
How many bags of concrete for a driveway?
One cubic yard requires about 45 bags of 80 lb concrete or 60 bags of 60 lb concrete. For a 2.5 cubic yard single-car driveway, that is about 113 bags of 80 lb mix. Bagged concrete is only practical for very small driveways; ready-mix delivery is recommended for anything over 1-2 cubic yards.
How long does a concrete driveway take to cure?
Concrete reaches initial set in 24-48 hours and can handle foot traffic. Light vehicle traffic is safe after 7 days when concrete reaches about 70% strength. Full strength (3,000-4,000 PSI) is reached at 28 days. Avoid parking heavy vehicles on new concrete for at least 10 days.
Can I pour a concrete driveway myself?
Small driveways are a feasible DIY project if you have experience with concrete work. You need proper formwork, a compacted gravel base, reinforcement (rebar or wire mesh), and enough helpers to finish before the concrete sets. For driveways over 200 square feet, hiring a professional is recommended.
What is the best finish for a concrete driveway?
A broom finish is the most common and practical choice for driveways. It provides excellent traction in wet conditions. Other options include exposed aggregate for a decorative look, stamped patterns to mimic stone or brick, and smooth trowel finishes (not recommended for driveways due to slip hazard).
Does this calculator store my data?
No. All calculations run entirely in your browser. No data is sent to any server, and nothing is stored.