Gravel vs. Concrete Driveway: Quantities, Depth and Cost Drivers
Quick answer: A 12 x 40 ft driveway at 4 inches deep needs about 9.2 tons of gravel (6.52 cubic yards) when you include a 10% allowance for compaction. The same footprint poured in concrete at 4 inches needs about 6.52 cubic yards of ready-mix with a 10% waste allowance, plus a gravel base underneath. Gravel is ordered by the ton, concrete by the cubic yard.
Choosing between gravel and concrete is partly about looks and maintenance, but it is also about how much material you must buy and handle. Before you compare quotes, run both quantities. The free at RenoCalcs make that comparison quick.
How Each Material Is Measured
Suppliers sell gravel by weight (tons) and concrete by volume (cubic yards). That difference trips people up when they compare quotes. Convert both to the same footprint first.
For a 12 x 40 ft driveway (480 sq ft) at 4 inches:
• Volume: 480 x 0.333 = 160 cubic feet, or 5.93 cubic yards
• With a 10% allowance: 6.52 cubic yards
For gravel, multiply by the material weight. The defaults to 2,800 lb per cubic yard (1.4 tons), a middle value for crushed stone. Real weights range from about 2,400 to 3,000 lb per cubic yard, so use your supplier’s figure when you have it. That gives 6.52 x 1.4 = 9.13 tons, which rounds up to about 9.2 tons.
Depth Guidance
Gravel driveways are commonly built 4 to 6 inches deep, often layered with larger stone below and finer stone on top. Soft soil or heavy vehicles call for a thicker base. Concrete driveways are commonly poured around 4 inches for light vehicle use, and thicker where heavier loads are expected. Follow local code and ask a contractor if you are unsure.
A concrete driveway also needs a compacted gravel base beneath it, so you may need both materials. The covers the slab, and the gravel figure above covers a 4-inch base.
Side-by-Side Comparison
Factor | Gravel driveway | Concrete driveway
Ordered in | Tons | Cubic yards
12 x 40 ft at 4 in (with 10%) | about 9.2 tons | about 6.52 cu yd, plus base
DIY difficulty | Spread and compact | Forms, pour, finishing, curing
Typical upkeep | Top up and regrade | Seal cracks and joints
Delivery | Bulk truck | Ready-mix truck, timed pour
What Drives the Cost
Material price is only part of the picture. Delivery distance, the number of truck loads, base preparation, drainage, forms, reinforcement, and finishing labor all move the total. Because these vary by region, ask for itemized quotes rather than comparing a single price per cubic yard or ton.
Planning the Delivery
Gravel arrives in bulk and is tipped from a truck, so plan where it can be dumped and spread. Ready-mix concrete is perishable: forms and base must be ready before the truck arrives, and you will want helpers on site. Order a little extra of either material rather than running short mid-job.
Frequently Asked Questions
How many tons of gravel do I need for a 12 x 40 ft driveway?
About 9.2 tons at 4 inches deep with a 10% allowance, using 1.4 tons per cubic yard. Thicker layers need proportionally more.
How much concrete do I need for a 12 x 40 ft driveway?
About 5.93 cubic yards at 4 inches before waste and 6.52 cubic yards with a 10% allowance.
Do I need gravel under a concrete driveway?
A compacted gravel base is common practice under slabs, but requirements vary with soil and local code.
How to Decide in Five Minutes
Measure the driveway, run both quantities, and ask suppliers for itemized quotes in the units they sell. If you want a low-effort surface you can build in stages, gravel is simpler. If you want a hard, uniform surface and can handle a timed pour, concrete may suit you better. These numbers are estimates, so check local building codes before you commit.
Quick answer: A 12 x 40 ft driveway at 4 inches deep needs about 9.2 tons of gravel (6.52 cubic yards) when you include a 10% allowance for compaction. The same footprint poured in concrete at 4 inches needs about 6.52 cubic yards of ready-mix with a 10% waste allowance, plus a gravel base underneath. Gravel is ordered by the ton, concrete by the cubic yard.
Choosing between gravel and concrete is partly about looks and maintenance, but it is also about how much material you must buy and handle. Before you compare quotes, run both quantities. The free at RenoCalcs make that comparison quick.
How Each Material Is Measured
Suppliers sell gravel by weight (tons) and concrete by volume (cubic yards). That difference trips people up when they compare quotes. Convert both to the same footprint first.
For a 12 x 40 ft driveway (480 sq ft) at 4 inches:
• Volume: 480 x 0.333 = 160 cubic feet, or 5.93 cubic yards
• With a 10% allowance: 6.52 cubic yards
For gravel, multiply by the material weight. The defaults to 2,800 lb per cubic yard (1.4 tons), a middle value for crushed stone. Real weights range from about 2,400 to 3,000 lb per cubic yard, so use your supplier’s figure when you have it. That gives 6.52 x 1.4 = 9.13 tons, which rounds up to about 9.2 tons.
Depth Guidance
Gravel driveways are commonly built 4 to 6 inches deep, often layered with larger stone below and finer stone on top. Soft soil or heavy vehicles call for a thicker base. Concrete driveways are commonly poured around 4 inches for light vehicle use, and thicker where heavier loads are expected. Follow local code and ask a contractor if you are unsure.
A concrete driveway also needs a compacted gravel base beneath it, so you may need both materials. The covers the slab, and the gravel figure above covers a 4-inch base.
Side-by-Side Comparison
Factor | Gravel driveway | Concrete driveway
Ordered in | Tons | Cubic yards
12 x 40 ft at 4 in (with 10%) | about 9.2 tons | about 6.52 cu yd, plus base
DIY difficulty | Spread and compact | Forms, pour, finishing, curing
Typical upkeep | Top up and regrade | Seal cracks and joints
Delivery | Bulk truck | Ready-mix truck, timed pour
What Drives the Cost
Material price is only part of the picture. Delivery distance, the number of truck loads, base preparation, drainage, forms, reinforcement, and finishing labor all move the total. Because these vary by region, ask for itemized quotes rather than comparing a single price per cubic yard or ton.
Planning the Delivery
Gravel arrives in bulk and is tipped from a truck, so plan where it can be dumped and spread. Ready-mix concrete is perishable: forms and base must be ready before the truck arrives, and you will want helpers on site. Order a little extra of either material rather than running short mid-job.
Frequently Asked Questions
How many tons of gravel do I need for a 12 x 40 ft driveway?
About 9.2 tons at 4 inches deep with a 10% allowance, using 1.4 tons per cubic yard. Thicker layers need proportionally more.
How much concrete do I need for a 12 x 40 ft driveway?
About 5.93 cubic yards at 4 inches before waste and 6.52 cubic yards with a 10% allowance.
Do I need gravel under a concrete driveway?
A compacted gravel base is common practice under slabs, but requirements vary with soil and local code.
How to Decide in Five Minutes
Measure the driveway, run both quantities, and ask suppliers for itemized quotes in the units they sell. If you want a low-effort surface you can build in stages, gravel is simpler. If you want a hard, uniform surface and can handle a timed pour, concrete may suit you better. These numbers are estimates, so check local building codes before you commit.
