How Much Concrete for a 14x20 Driveway?
How much concrete for a 14x20 driveway depends on thickness. The driveway covers 14 × 20 = 280 square feet, and at 5 inches thick that is about 4.32 cubic yards, or 4.75 yards with a 10 percent allowance. Mixed from bags, it is roughly 195 bags of 80 lb mix.
Concrete calculator →The math for a 14x20 driveway
- Area: 14 ft × 20 ft = 280 sq ft.
- Thickness in feet: 5 in ÷ 12 = 0.417 ft.
- Volume: 280 × 0.417 = 116.7 cubic feet.
- Cubic yards: 116.7 ÷ 27 = 4.32 yd³.
- With 10% extra: 4.75 yd³.
The concrete calculator runs the same steps for any size and thickness.
Related: How Much Concrete for a 14x20 Slab?
Concrete for a 14x20 driveway by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 93.3 | 3.46 | 3.80 | 156 | 208 |
| 5 in | 116.7 | 4.32 | 4.75 | 195 | 260 |
| 6 in | 140.0 | 5.19 | 5.70 | 234 | 312 |
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 14x20 Patio?
Truck or bags?
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.
Keeping cracks under control
Plan the joints before the pour. Panels close to square crack less than long, narrow ones, and joint spacing around 10 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 14x20 driveway at 4 inches?
About 3.46 cubic yards, or 3.80 with 10 percent extra.
How many yards for a 14x20 driveway at 6 inches?
About 5.19 cubic yards.
How many 80 lb bags for a 14x20 driveway?
About 156 bags at 4 inches thick, before any waste allowance.
How many square feet is a 14x20 driveway?
280 square feet.
Should I add extra for waste?
Yes. Adding 5 to 10 percent covers uneven base, spillage and form bulges.
How thick should the base under the slab be?
About 4 inches of compacted gravel is common for residential slabs, more on soft or poorly drained soil.
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 12x80 Driveway?
- How Much Concrete for a 12x100 Driveway?
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