How Much Concrete for a 12x20 Driveway?
For a 12x20 driveway poured 5 inches thick, plan on about 3.70 cubic yards of concrete. That comes from 240 square feet times 0.417 feet of depth, divided by 27. How much concrete for a 12x20 driveway at other thicknesses is in the table below.
Concrete calculator →The math for a 12x20 driveway
- Area: 12 ft × 20 ft = 240 sq ft.
- Thickness in feet: 5 in ÷ 12 = 0.417 ft.
- Volume: 240 × 0.417 = 100.0 cubic feet.
- Cubic yards: 100.0 ÷ 27 = 3.70 yd³.
- With 10% extra: 4.07 yd³.
The concrete calculator runs the same steps for any size and thickness.
Related: How Much Concrete for a 12x20 Slab?
Concrete for a 12x20 driveway by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 80.0 | 2.96 | 3.26 | 134 | 178 |
| 5 in | 100.0 | 3.70 | 4.07 | 167 | 223 |
| 6 in | 120.0 | 4.44 | 4.89 | 200 | 267 |
Bag counts assume about 0.60 cubic feet per 80 lb bag and 0.45 per 60 lb bag, rounded up.
Thickness for this job
Residential concrete driveways are usually 4 to 6 inches thick. Five inches is a sensible minimum if a pickup or delivery truck uses it, and 6 inches if heavier vehicles or an RV park on it. The apron at the street often gets the thicker section.
Related: How Much Concrete for a 12x20 Patio?
Placing the order
A cubic yard of concrete is 27 cubic feet and weighs roughly 4,000 pounds. Most ready-mix trucks carry up to about 9 to 10 yards, though local trucks and rules vary. If your total is under a yard or two, bagged mix or a short-load supplier may be cheaper.
Base and forms
Under the slab, most residential pours sit on about 4 inches of compacted gravel. The base spreads the load, drains water away and keeps the driveway from cracking as the soil freezes and thaws. Compact the base in thin lifts, and dampen it just before the pour so it does not pull water out of the mix.
Joints, mesh and rebar
Plan the joints before the pour. Panels close to square crack less than long, narrow ones, and joint spacing around 8 feet is typical for a 4-inch slab. Cut joints with a groover while the concrete is soft or with a saw within the first day.
Questions people ask
How many yards of concrete for a 12x20 driveway at 4 inches?
About 2.96 cubic yards, or 3.26 with 10 percent extra.
How many yards for a 12x20 driveway at 6 inches?
About 4.44 cubic yards.
How many 80 lb bags for a 12x20 driveway?
About 134 bags at 4 inches thick, before any waste allowance.
How many square feet is a 12x20 driveway?
240 square feet.
How much does a cubic yard of concrete weigh?
Roughly 4,000 pounds, or about 2 tons, for normal-weight concrete.
When is bagged concrete practical?
Usually for jobs under about a cubic yard. Beyond that, mixing dozens of bags by hand gets slow and batches may not blend well.
Related guides
- How Much Area Does a Yard of Concrete Cover?
- How Many Bags of Concrete in a Yard? 40, 60, 80 lb
- Gravel Base Under a Concrete Slab: Depth and Tons
- How Many Yards in a Concrete Truck? Mixer Sizes
- Concrete Short Load Fee: What It Is and How to Cut It
- 60 lb vs 80 lb Concrete Bags: Yield, Count, and Cost
- Rebar vs Wire Mesh in a Slab: Which One to Use
- Cost to Pour a Concrete Slab: Per Square Foot
- How Much Concrete for a 10x80 Driveway?
- How Much Concrete for a 10x100 Driveway?
As an Amazon Associate, AsphaltTons.com earns from qualifying purchases. Product links below are sponsored.