How Much Gravel Do I Need for a Driveway?
A gravel driveway comes down to two numbers: how deep you go, and how many tons you order. Get them right and you lay it once. Get them wrong and you’re paying a second delivery fee for a half-ton of stone, or worse, ripping out a driveway that ruts the first wet winter.
This guide walks the whole job: measuring, choosing a depth, the layered build that keeps a driveway from sinking, and how to turn your dimensions into the tons or yards your supplier actually sells. There’s a calculator partway down that does the math for you.
The short answer
For a standard residential driveway, plan on 4 inches of gravel as a finished surface, or 6 to 8 inches built in layers if you’re starting on bare dirt. As a rough figure, a single-car driveway (about 10 by 20 feet) at 4 inches deep needs roughly 2.5 cubic yards, or about 3.5 tons. A two-car driveway is closer to 5 yards. Your real number depends on your exact size and depth, so measure first.
Step 1: Measure the area
Length times width, both in feet. A driveway that’s 12 feet wide and 40 feet long is 480 square feet. Simple.
Real driveways are rarely a clean rectangle. If yours widens into a parking apron, curves toward the garage, or splits around an island, break it into rectangles, figure each one separately, and add them together. For a curved or pie-shaped section, measure the average width and treat it as a rectangle. Round up when you’re unsure. Stone is far cheaper than a return trip.
On a sloped driveway, measure along the surface, not the flat map distance. A steep grade adds real square footage that’s easy to undercount.
Step 2: Pick the right depth
Depth is where most people come up short. What you need depends on what’s underneath and what drives on it.
| Situation | Recommended depth |
|---|---|
| Refreshing existing gravel | 2 to 3 inches of new stone |
| Finished surface over a solid base | 4 inches |
| New driveway over bare dirt | 6 to 8 inches, built in layers |
| Soft clay or wet ground | 8 to 10 inches plus fabric |
If your soil is soft or holds water, add a couple inches and lay a geotextile fabric down first. The fabric stops the stone from disappearing into the mud, which is the single most common reason gravel driveways fail early.
Build a real driveway in layers
A driveway that lasts isn’t one dump of stone. It’s three layers, each doing a different job:
- Base layer (3 to 4 inches): large, angular crushed stone, often called #3 or “clean” rock. It carries the load and drains.
- Middle layer (2 to 3 inches): a mid-size stone like #57 that locks into the base.
- Surface layer (1 to 2 inches): a finer, packable stone such as crusher run (also called #411 or QP), which has fines that bind and give a smooth drivable top.
Skipping the base to save money is why driveways rut, pothole, and wash out. Each layer should be compacted before the next goes down.
Cubic yards or tons? How gravel is sold
Suppliers quote gravel three ways: by the cubic yard (volume), by the ton (weight), and by the bag (small jobs). Which one you get depends on the yard, and that’s the trap. You measured in feet, the truck is priced in tons, and the conversion runs through cubic yards in the middle.
The chain is short. Area times depth (in feet) gives cubic feet. Divide by 27 to get cubic yards. Multiply yards by about 1.4 to get tons for standard gravel. Crushed stone runs a little heavier, around 1.5 tons per yard, and pea gravel a little lighter, near 1.35. Those small differences add up once you’re ordering several tons, which is why it pays to tell the supplier exactly what stone you want.
Run your numbers
Open the full gravel calculator
Three driveways, worked out
| Driveway | Size | Depth | Gravel needed (with 10% waste) |
|---|---|---|---|
| Single-car | 10 × 20 ft | 4 in | ~2.7 cu yd / ~3.8 tons |
| Two-car | 20 × 20 ft | 4 in | ~5.4 cu yd / ~7.5 tons |
| Long rural drive | 12 × 100 ft | 6 in | ~24 cu yd / ~34 tons |
Notice the rural drive isn’t just “longer”, the extra depth and length compound. That’s why guessing off a small job badly underestimates a big one.
What gravel costs
Bulk gravel typically runs $15 to $75 a ton depending on the stone and your region, with crushed stone and decorative rock at the higher end and basic fill at the low end. Delivery usually adds $50 to $150 per load, and most trucks carry quite a few tons, so the per-ton delivery cost drops fast on bigger orders. Bagged gravel is far more expensive per ton and only makes sense for very small patches.
Always add a waste factor
Order the exact calculated figure and the first low spot leaves you short. Add 10% on a flat, well-edged job, and 15% or more if the ground rolls or the edges are hard to hold. Coming up short means a second delivery fee that often costs more than the extra stone would have.
Five mistakes that leave you short
- Going too thin. Two inches of stone over dirt won’t hold up to a truck. Four is the working minimum.
- Skipping the base layer. Surface stone alone sinks and ruts.
- No fabric over soft soil. The gravel migrates into the mud and disappears.
- No edging. Without a border, gravel spreads sideways and you’re topping it up forever.
- Forgetting waste. Flat, square ground is a myth. Always order a margin.
Frequently asked questions
How many tons of gravel are in a cubic yard?
About 1.4 tons for standard gravel, ranging from 1.35 for pea gravel to 1.5 for dense crushed stone. The calculator lets you pick the type so the tonnage is right.
How much gravel do I need for a 2-car driveway?
A typical 20 by 20 foot two-car driveway at 4 inches deep needs about 5 cubic yards, or roughly 7 tons, before waste. Add 10% and order closer to 7.5 tons.
Is it cheaper to buy gravel by the ton or the yard?
Per unit they’re usually close once converted; the bigger savings come from ordering in bulk rather than bags and from a full delivery load. Use the calculator to compare both for your size.
How deep should a gravel driveway be?
Four inches over a solid base, or six to eight inches in layers over bare dirt. Soft or wet ground needs more, plus fabric.
Bedding pavers or laying a sand base under the stone? The sand calculator sizes that the same way.