How Much Concrete for a 10x40 Driveway?
How much concrete for a 10x40 driveway depends on thickness. The driveway covers 10 × 40 = 400 square feet, and at 5 inches thick that is about 6.17 cubic yards, or 6.79 yards with a 10 percent allowance. Mixed from bags, it is roughly 278 bags of 80 lb mix.
Concrete calculator →The math for a 10x40 driveway
- Area: 10 ft × 40 ft = 400 sq ft.
- Thickness in feet: 5 in ÷ 12 = 0.417 ft.
- Volume: 400 × 0.417 = 166.7 cubic feet.
- Cubic yards: 166.7 ÷ 27 = 6.17 yd³.
- With 10% extra: 6.79 yd³.
The concrete calculator runs the same steps for any size and thickness.
Related: How Much Concrete for a 10x40 Slab?
Concrete for a 10x40 driveway by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 133.3 | 4.94 | 5.43 | 223 | 297 |
| 5 in | 166.7 | 6.17 | 6.79 | 278 | 371 |
| 6 in | 200.0 | 7.41 | 8.15 | 334 | 445 |
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 Gravel for a 10x40 Driveway?
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.
Getting the ground ready
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
Cut or tool control joints so the slab cracks where you want it to. A common rule is spacing them, in feet, at no more than two to three times the slab thickness in inches, so about 12 feet apart for a 4-inch slab, and about a quarter of the slab depth deep.
Questions people ask
How many yards of concrete for a 10x40 driveway at 4 inches?
About 4.94 cubic yards, or 5.43 with 10 percent extra.
How many yards for a 10x40 driveway at 6 inches?
About 7.41 cubic yards.
How many 80 lb bags for a 10x40 driveway?
About 223 bags at 4 inches thick, before any waste allowance.
How many square feet is a 10x40 driveway?
400 square feet.
How many 80 lb bags make a cubic yard?
About 45. Each 80 lb bag yields roughly 0.6 cubic feet, and a cubic yard is 27 cubic feet.
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 10x25 Driveway?
- How Much Concrete for a 10x30 Driveway?
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