How Much Gravel Do You Need for a Driveway?

Ordering gravel seems simple — measure the driveway, pick a depth, do the math. But the difference between a perfectly filled truck and coming up three tons short is knowing a few things that the bag at the hardware store won't tell you. This guide covers measuring, depth, material types, and the formula that turns square feet into cubic yards and tons — plus a free gravel calculator that does the math instantly.

Step 1: Measure the driveway

Measure the length and width of your driveway in feet. For a simple rectangular driveway, multiply length by width to get the square footage. For an irregular shape, break it into rectangles, calculate each section separately, and add them together.

Example: a 20-foot-wide driveway that runs 50 feet long is 1,000 square feet. That is your area. Do not skip measuring — guessing leads to overpaying or running short, and a second delivery carries a second delivery fee.

Step 2: Choose the right depth

Gravel depth depends on what you're building. Here is what works in practice:

• 2 inches — Garden paths, decorative beds. Foot traffic only.
• 3 inches — Residential driveway surface layer. Handles cars and light trucks.
• 4 inches — Driveways that see heavy trucks, trailers, or frequent turning.
• 6+ inches — Compacted base course under pavers or a new driveway built from bare soil.

A full driveway built from scratch is not a single pour. It is usually three layers: a large angular base (4–6 inches), a middle layer of smaller stone (2–3 inches), and a surface layer of crushed gravel (2–3 inches). Total depth: 8 to 12 inches. Run each layer as a separate calculation.

Step 3: Pick the gravel type

Gravel type changes the weight, not the volume. A cubic yard is always 27 cubic feet, but what that cubic yard weighs depends on the stone:

• Crushed stone — Angular, locks together. ~1.4 tons per cubic yard. Best for driveways.
• Road base — Mix of crushed stone and fines. ~1.5 tons/cy. Compacts hard. Use for the base layer.
• Pea gravel — Smooth, round, ~1.3 tons/cy. Looks good but shifts under tires. Use for paths and beds, not driveways.
• River rock — Larger, decorative, ~1.2 tons/cy. Too unstable for a driving surface.

Suppliers price by the ton in most regions because trucks are weighed on a scale. Landscape yards sometimes price by the cubic yard. Always ask which unit you are being quoted in before comparing two prices — the one that sounds cheaper may simply be the smaller unit.

Step 4: Calculate cubic yards and tons

The formula is straightforward:

Cubic yards = (length × width × depth in inches ÷ 12) ÷ 27

Tons = cubic yards × material density

Worked example: a 20 × 50 ft driveway at 3 inches. That is 1,000 sq ft × 0.25 ft = 250 cubic feet. Divide by 27: 9.26 cubic yards. In crushed stone at 1.4 tons per cubic yard, that is 12.96 tons. Round up to 13 tons.

Use our gravel calculator to run these numbers instantly for any driveway size, depth, and gravel type. It gives you both cubic yards and tons so you can quote your supplier in whichever unit they use.

Should you add extra?

Yes. Angular gravel compacts — it loses 10–20% of its loose volume once rolled or driven on. Order about 15% more than the calculated figure when the finished depth matters. Rounded stone like pea gravel and river rock is not compacted and does not need the extra allowance.

Also, gravel settles over the first few months. A fresh driveway looks thicker than it will be next season. If the finished surface height matters, tell your supplier what you want after compaction, not what the truck dumps on the ground.

How much does gravel cost?

Prices vary by region, but as a rough guide for bulk delivery:

• Crushed stone: $25–50 per ton or $35–75 per cubic yard
• Road base: $20–40 per ton
• Pea gravel: $35–70 per ton
• River rock: $50–100+ per ton

Delivery fees run $50–150 depending on distance and are usually flat, so a larger order spreads that cost across more material. Most suppliers have a minimum — often 3–5 tons or 2–3 cubic yards.

Quick checklist before you order

1. Measure accurately. Do not pace it off. Use a tape measure or measuring wheel.
2. Know your depth. Tell the supplier what the gravel is for — they will tell you if your depth is right.
3. Ask about compaction. If the supplier's quote is by loose volume, ask how much it compacts so you order enough after settling.
4. Confirm the unit. A quote of "$35" may be per ton or per yard. The difference on ten yards is hundreds of dollars.
5. Prepare the site. Have the driveway graded and a geotextile fabric laid underneath to stop the gravel mixing with the soil below.