Concrete Driveway Calculator — Volume and Cost Estimate
Plan your concrete driveway: enter its length, width and thickness for the volume, bags, weight and an estimated cost — plus guidance on thickness and reinforcement for a drive that lasts.
How to estimate a concrete driveway
The formula
A driveway is a slab, so volume is length × width × thickness. Because driveways carry vehicles, thickness and reinforcement matter more than for a patio — get those right before estimating cost.
- Volume = length × width × thickness.
- A standard car driveway is 4" (100 mm); add depth for heavier vehicles.
- Cost combines material, delivery and placement — adjust the rates above.
Worked example
A two-car driveway, 40 ft × 20 ft at 5 inches:
- Volume = 40 × 20 × (5÷12) = 333 ft³ = 12.3 yd³.
- Add 10% waste → 13.6 yd³ (10.4 m³).
- At $140/yd³ material that's ≈ $1,900 in concrete alone.
About 13.6 cubic yards (10.4 m³) — right at the threshold where on-site batching gets attractive.
Sizing, thickness & waste
Recommended driveway thickness
- Cars / light vehicles: 4" (100 mm).
- Heavier vehicles, RVs, trucks: 5–6" (125–150 mm).
- Add wire mesh or rebar, and contraction joints every ~10 ft.
Slope, sub-base and waste
- Grade the sub-base for drainage (≈ 1–2% slope away from buildings).
- Compact a 4 in granular sub-base before pouring.
- Order 10% extra — uneven sub-base eats volume quickly.
What produces this much concrete?
A typical driveway sits near the volume where batching on site competes with delivery:
Small pour — mix on site
Under ~0.5 m³ (≈0.65 yd³) you can mix on site from bags. A portable mixer saves time over hand-mixing once you pass a few bags.
Medium pour — small mixer or ready-mix
From ~0.5–2 m³, a small or self-loading mixer keeps you independent of delivery schedules; otherwise order ready-mix.
Large pour — self-loading mixer or delivery
At 2–10 m³, compare ready-mix delivery against a self-loading mixer or mixer truck if you pour regularly.
On-site batching becomes economical
Above ~10 m³, repeated or remote pours usually cost less with on-site batching than per-load delivery. A mobile or compact plant sets up fast.
Continuous production — dedicated plant
Beyond ~50 m³ per job, a stationary or ready-mix plant delivers the throughput and consistency large projects need.
Frequently asked questions
How much concrete does a driveway need?
Multiply the driveway length × width × thickness. A 40 ft × 20 ft drive at 5 inches needs about 13.6 cubic yards (10.4 m³) including waste. Enter your dimensions above for an exact figure.
How thick should a concrete driveway be?
Four inches (100 mm) is standard for cars; use 5–6 inches (125–150 mm) for heavier vehicles, with reinforcement and proper contraction joints.
How much does a concrete driveway cost?
Material is roughly $120–160 per cubic yard; fully installed, concrete driveways commonly run $6–12 per square foot depending on thickness, finish and reinforcement. Use the rates above to estimate yours.
How much extra concrete should I order for waste?
Add 5–10% to your calculated volume to cover spillage, uneven subgrade, and over-excavation. For small or irregular pours, 10% is safer because running short mid-pour creates a cold joint.
Are these estimates exact?
Results are planning estimates. Always confirm volumes, mix designs and structural details with your supplier or engineer before pouring.