How Much Concrete for a 16x20 Driveway?
For a 16x20 driveway poured 5 inches thick, plan on about 4.94 cubic yards of concrete. That comes from 320 square feet times 0.417 feet of depth, divided by 27. How much concrete for a 16x20 driveway at other thicknesses is in the table below.
Concrete calculator →The math for a 16x20 driveway
- Area: 16 ft × 20 ft = 320 sq ft.
- Thickness in feet: 5 in ÷ 12 = 0.417 ft.
- Volume: 320 × 0.417 = 133.3 cubic feet.
- Cubic yards: 133.3 ÷ 27 = 4.94 yd³.
- With 10% extra: 5.43 yd³.
The concrete calculator runs the same steps for any size and thickness.
Related: How Much Concrete for a 16x20 Patio?
Concrete for a 16x20 driveway by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 106.7 | 3.95 | 4.35 | 178 | 238 |
| 5 in | 133.3 | 4.94 | 5.43 | 223 | 297 |
| 6 in | 160.0 | 5.93 | 6.52 | 267 | 356 |
Bag counts assume about 0.60 cubic feet per 80 lb bag and 0.45 per 60 lb bag, rounded up.
Choosing the thickness
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 Gravel for a 16x20 Patio?
Truck or bags?
Concrete is ordered by the cubic yard, and a yard is 27 cubic feet. Ready-mix plants usually sell in quarter- or half-yard steps, so round up to the next step rather than down. Running short in the middle of a pour leaves a cold joint, which is a weak seam in the driveway.
Base and forms
Uneven ground is the main reason pours run short. Every half inch of extra depth across the driveway adds concrete you did not plan for. Screed the base flat, check it with a string line and set the forms to finished height before the truck arrives.
Keeping cracks under control
Reinforcement does not stop cracks, but it holds them tight. Wire mesh or rebar set mid-depth on chairs is common for a driveway that carries vehicles; fiber-reinforced mix is an option for light-duty slabs. Joints about 10 feet apart control where cracks form.
Questions people ask
How many yards of concrete for a 16x20 driveway at 4 inches?
About 3.95 cubic yards, or 4.35 with 10 percent extra.
How many yards for a 16x20 driveway at 6 inches?
About 5.93 cubic yards.
How many 80 lb bags for a 16x20 driveway?
About 178 bags at 4 inches thick, before any waste allowance.
How many square feet is a 16x20 driveway?
320 square feet.
Should I add extra for waste?
Yes. Adding 5 to 10 percent covers uneven base, spillage and form bulges.
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 14x80 Driveway?
- How Much Concrete for a 14x100 Driveway?
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