How Much Gravel Do You Need for a Driveway?

Your gravel driveway is looking thin, so how many tons should you order? The short answer is to measure the area, pick a depth, and turn that into volume. Gravel is usually sold by the ton, so you convert cubic yards to weight before you call the supplier. This guide shows the simple formula, a full worked example, and the right depth to use.

The Gravel Volume Formula

Every gravel estimate starts with volume. You only need the driveway area and the depth of stone you plan to lay. Keep the math in feet from start to finish.

First, measure the length and width in feet, then multiply them for the area in square feet. Next, change the depth from inches to feet by dividing by 12. So 4 in becomes 0.33 ft. Then multiply area by depth to get cubic feet.

Finally, divide by 27, because one cubic yard holds 27 cubic feet. Here is the formula in plain terms:

• Area (sq ft) = length ft x width ft
• Volume (cu ft) = area x depth in feet
• Cubic yards = volume in cu ft / 27

Keep every measurement in feet before you multiply. Mixing inches and feet is the most common estimating mistake. If your driveway is not a clean rectangle, split it into smaller boxes, size each one, then add the results.

Convert Cubic Yards to Tons

Gravel is often sold by the ton, not the cubic yard. So you need one more step after you find your volume. This step turns your cubic yards into a weight the truck can deliver.

Most driveway gravel weighs about 1.4 tons per cubic yard. Some crushed stone runs closer to 1.5 tons per cubic yard. To get tons, multiply your cubic yards by that weight.

Weight varies by the type and size of stone, and by how wet it is. Always confirm the exact weight with your supplier before you order.

• Tons = cubic yards x 1.4 (typical gravel)
• Heavier crushed stone: use about 1.5 per cubic yard
• Wet gravel weighs a bit more than dry

This weight per yard is the bridge between volume and what arrives on the truck. Our advanced sand and aggregate calculator handles this conversion for you.

A Worked Example

Let us size a real driveway from start to finish. Say your driveway is 20 ft long and 10 ft wide, and you want 4 in of gravel. Follow the five steps in order.

• Step 1: Find the area. 20 ft x 10 ft = 200 sq ft.
• Step 2: Convert depth to feet. 4 in / 12 = 0.33 ft.
• Step 3: Find the volume. 200 sq ft x 0.33 ft = 66.7 cu ft.
• Step 4: Convert to cubic yards. 66.7 / 27 = 2.47 cu yd.
• Step 5: Convert to tons. 2.47 x 1.4 = about 3.5 tons.

So this driveway needs roughly 2.5 cubic yards, or about 3.5 tons of gravel. Add a little extra for compaction, which we cover below.

Remember that gravel weight varies, about 1.4 to 1.5 tons per cubic yard depending on the stone. Confirm the number with your supplier before the delivery arrives.

Recommended Depth and Layers

A gravel driveway works best in layers, not one thin coat. Each layer does a different job, from drainage to a smooth surface. Spread and compact each layer before the next goes on.

• Base layer: 4 to 6 in of larger crushed stone for strength and drainage.
• Middle layer: about 4 in of medium stone to lock the base together.
• Top layer: about 4 in of smaller gravel for a smooth driving surface.

For a brand new driveway, plan for a total depth of 8 to 12 in across these layers. For a simple refresh over a solid base, a single 4 in top layer is often enough.

Deeper driveways handle heavy vehicles and soft soil better. If your ground stays wet, add more base stone for drainage. Local codes may set rules for driveways, so check before you dig.

Order a Little Extra

Gravel settles and compacts after it is spread and driven on. So the loose amount you order shrinks once it packs down. Plan for this shrink before you place the order.

Order about 5 to 10 percent more than your raw estimate. Add more if your driveway has curves, slopes, or an odd shape.

• Compaction: gravel packs down 10 to 20 percent as it settles.
• Spillage: some stone spreads past the edges during delivery.
• Refills: keep extra to top up low spots later.

For our 3.5 ton example, adding 10 percent means ordering about 3.9 tons. Rounding up to 4 tons is a safe, simple choice.

It is cheaper to order a little extra now than to pay for a second small delivery. Confirm the final amount and stone weight with your supplier, and follow any local rules for driveways.

Frequently Asked Questions About Gravel for a Driveway

Sources

This article is for general education only, not professional construction or engineering advice. Material needs vary by product, site, and local building codes, so confirm quantities with your supplier and follow local rules. Reviewed for accuracy by Prof. Dr. Khalil Mudassar, PhD. Last updated September 12, 2026.