Driveway
Concrete Driveway Calculator
A driveway is a slab that has to carry cars. Start at 5 or 6 inches, then price it with the rate your plant quoted.
Your region
Feet, inches, cubic yards, and 40–80 lb bags
Concrete Calculator
Example measurements — replace them with yours.
Common sizes
Most orders add 5–10% for spillage, uneven ground, and the last bit left in the chute.
Cost, truck size, and concrete weight
Leave a price blank to skip that estimate. Use the number your supplier quoted.
This job
Add each pour — slab, piers, steps — and Concrete Calculator totals them.
How to use a concrete driveway calculator
A driveway is a slab that carries cars. Start at 5 or 6 inches on a compacted base. The volume math matches a patio; the thickness does not. RVs, soft soil, and truck traffic push toward a designed section — Concrete Calculator will happily compute a 4 inch drive if you type it, but that is walk thickness, not vehicle thickness.
Open the price fields and type the delivered rate. Concrete Calculator multiplies your number by the quarter-yard order — not a national average. Delivery distance, mix design, fiber, and short-load fees change the ticket more than any blog “average cost per foot.”
Worked example with the concrete driveway calculator
20 × 40 × 0.5 = 400 ft³ = 14.8 yd³ neat. With 10% ≈ 16.3 → order 16.50 yd³. At $160/yd that material line is about $2,640 before delivery fees and tax.
Same drive at 4 inches would be 9.88 yd³ neat — thinner, cheaper, and wrong for most vehicle loads. Two-car 24×24 at 6 inches is 10.67 yd³ neat before waste. Re-run the Concrete Driveway Calculator after thickness changes — depth moves yardage faster than length.
| Drive size | 6 in neat yd³ | With 10% → order |
|---|---|---|
| 12×20 | 4.44 | 5.00 |
| 20×40 | 14.81 | 16.50 |
| 24×24 | 10.67 | 11.75 |
Base gravel and flares
Size the stone base with the gravel calculator before you order concrete. Flares at the street and turnouts are easy to miss on a tape run down the centerline — measure the wide end as its own rectangle or average width carefully. Wire mesh or rebar does not replace thickness; it also barely moves cubic yards unless you bump density for planning weight.
Common mistakes
Ordering 4 inch thickness because a patio calculator defaulted there.
- Ignoring short-load fees on a small apron poured alone.
- Forgetting the flare at the street when measuring length.
- Comparing only bag sticker price to a delivered yard without labor.
Bags, yards, or a truck?
Driveways are truck territory. Bag counts in the hundreds exist as a warning, not a plan. Compare ready-mix including short-load and pump charges against bags only if access is impossible. Use the ready-mix calculator for load counts on larger drives.
The formula Concrete Calculator uses
L×W×T ÷ 27. Coverage at 6 inches: 54 ft² per yard.
Who this is for
Homeowners replacing asphalt with concrete.
Builders bidding a two-car drive.
Driveway concrete estimate calculator checks
Measure length down the centerline and average the width if the drive tapers. Add flares as their own rectangles. Confirm 5–6 inch thickness for cars unless a drawing says otherwise. Size gravel base on the gravel calculator before pour day.
Driveway concrete cost calculator workflows: material = ordered yards × delivered $/yd; installed = area × $/ft² from the contractor. Keep those scopes separate when you compare bids.
Related calculators and guides
Open the pages that match the next question on the job — volume is only the first number.
- Slab calculator
- Cost calculator
- Ready-mix calculator
- Gravel calculator for the base
- Slab thickness guide
Frequently asked questions
How many yards for a driveway?
20×40×6 in = 14.8 yd³ neat; ~16.5 with 10% and rounding.
Is 4 inches enough?
4 inches is walk thickness. Many drives are 5–6 inches on a good base.
How much does a concrete driveway cost?
Volume × your local installed or material rate. Enter the quote here; national averages mislead.
Do I need gravel under it?
Usually yes. Size the base with the gravel calculator, then the slab here.
How many bags would that be?
14.8 yd³ ≈ 666 bags of 80 lb before waste — which is why drives use trucks.