Gravel Yardage Calculator for Driveway

This gravel yardage calculator works out the volume of crushed stone or gravel you need for a driveway in cubic yards, based on the driveway’s length, width, and desired depth. You enter those three measurements in feet (or inches for depth), and the calculator returns the volume in cubic yards, plus the equivalent in cubic feet and tons for a typical gravel density. The result is the exact amount to order, so you avoid both shortages and costly over-delivery.

Formula

The basic formula for gravel volume is:

Volume (cubic yards) = (Length × Width × Depth) ÷ 27

Where:

• Length = driveway length in feet (ft)
• Width = driveway width in feet (ft)
• Depth = gravel layer thickness in inches (in), converted to feet by dividing by 12
• 27 = number of cubic feet in one cubic yard (3 ft × 3 ft × 3 ft)

For the ton estimate, the calculator multiplies cubic yards by 1.4, which is the typical weight of one cubic yard of crushed gravel (about 2,800 lb or 1.4 tons). This factor varies with gravel type and moisture, so treat the ton figure as an approximation.

Worked Example

Using the default values from the calculator: a driveway 50 ft long, 10 ft wide, with a gravel depth of 4 inches.

1. Convert depth to feet: 4 in ÷ 12 = 0.3333 ft
2. Calculate volume in cubic feet: 50 ft × 10 ft × 0.3333 ft = 166.7 ft³
3. Convert to cubic yards: 166.7 ft³ ÷ 27 = 6.17 yd³ (rounded to 6.2 yd³)
4. Estimate tons: 6.17 yd³ × 1.4 = 8.64 tons (rounded to 8.6 tons)

The calculator shows 6.2 cubic yards, 166.7 cubic feet, and 8.6 tons for these inputs.

Why Depth Matters

The depth of the gravel layer is the most common source of error in driveway projects. A gravel driveway typically needs a total of 4 to 6 inches of compacted stone: 2–3 inches of larger base rock (e.g., #3 or #4 stone) followed by 2–3 inches of smaller surface gravel (e.g., #57 or #67). If you only measure the top layer, you’ll under-order by half. The calculator uses the total depth you enter, so be sure to include both layers if you’re planning a full driveway build.

Also note that gravel compacts by about 10–15% when rolled or driven on. Ordering 10–15% extra (or choosing a depth slightly above your minimum) compensates for compaction and for irregularities in the ground surface. Many contractors simply round up to the next half yard.

How to Measure Your Driveway

Accurate measurements are essential for a correct yardage estimate. Here’s how to get them:

• Length: Measure along the centerline from the road or apron to the end of the driveway. Use a tape measure or a measuring wheel for long distances.
• Width: Measure at several points (near the road, middle, and far end) and use the average. Driveways often flare at the road or widen near a garage.
• Depth: Decide the total compacted thickness you want. For a new driveway, 4–6 inches is standard. For a top-up on an existing gravel surface, measure the current depth and add the amount you want to add.
• Irregular shapes: If the driveway is not a simple rectangle, break it into rectangles and triangles. Calculate each section’s volume separately and add them together. The calculator handles one rectangle at a time.

Common Mistakes and How to Avoid Them

• Mixing units: The calculator expects feet for length and width, and inches for depth. If you measure in yards or meters, convert first (1 yd = 3 ft, 1 m = 3.28 ft). A common error is entering depth in feet instead of inches, which gives a result 12 times too large.
• Forgetting compaction: Freshly dumped gravel settles. If you order exactly the calculated volume, you may end up short after compaction. Add 10–15% or choose a depth 0.5–1 inch deeper.
• Ignoring the sub-base: A driveway built on soft soil needs a thicker base layer. The calculator assumes a uniform depth; if your ground is uneven, you’ll need more gravel in low spots.
• Rounding too early: Do the full calculation, then round up to the next whole or half yard. Rounding down can leave you short.
• Assuming all gravel weighs the same: The ton estimate uses 1.4 tons per cubic yard, which is typical for crushed limestone or granite. Pea gravel and river rock are lighter (about 1.2–1.3 tons/yd³), while some dense trap rock can reach 1.5 tons/yd³. Check with your supplier for the exact weight.

Cost and Ordering Considerations

Gravel is sold by the cubic yard, not by weight, at most quarries and landscape supply yards. The price per yard varies widely by region and type, but the volume you calculate is what you’ll be charged for. Delivery fees are usually separate and may be based on distance and truck size. For large projects (more than 10 yards), you might get a better per-yard rate, but you’ll also need space for a dump truck to spread the load. Always confirm the minimum order (often 1–5 yards) and whether the supplier will spread the gravel or just dump it.

If you’re ordering by the ton instead (some suppliers price by weight), use the ton estimate from the calculator as a starting point, but ask the supplier for the exact weight per yard of the specific gravel you’re buying. A 10-yard truckload typically weighs about 14 tons, so make sure your driveway and the delivery route can support that weight.

Alternatives to Gravel

While crushed stone is the most common driveway material, other options exist, each with different volume and cost profiles:

• Recycled concrete or asphalt: Cheaper than virgin gravel, but may contain rebar or other debris. Volume calculation is the same.
• Decomposed granite (DG): Finer material that compacts into a solid surface. Needs about the same depth as gravel (4–6 inches) but weighs slightly more per yard.
• Crushed shell: Common in coastal areas, lighter than stone, but may need more frequent replenishment.
• Paving stones or concrete: These are permanent surfaces that don’t require gravel volume calculations, but they need a gravel base layer underneath, so you’ll still use the calculator for the base.
• Asphalt or concrete: If you’re paving over a gravel base, the gravel depth is still important for drainage and stability.

Safety and Practical Tips

• Wear a dust mask when spreading gravel, especially if it’s dry and dusty. Silica dust can be harmful if inhaled over time.
• Use proper lifting technique when moving gravel with a shovel or wheelbarrow. A cubic yard of gravel weighs about 1.4 tons, so even a small wheelbarrow load is heavy.
• Spread gravel in thin layers (2–3 inches at a time) and compact each layer with a plate compactor or by driving over it. This prevents soft spots and extends the life of the driveway.
• Consider drainage: Gravel driveways should be slightly crowned (higher in the middle) so water runs off to the sides. The calculator assumes a flat surface; if you’re building a crown, you’ll need more gravel on the edges.
• Check local regulations before starting. Some areas require permits for driveway construction, and there may be rules about runoff and erosion control.

Frequently Asked Questions

How many cubic yards do I need for a 100-foot driveway?
Assuming a 10-foot width and 4-inch depth, the calculation is (100 × 10 × 0.333) ÷ 27 = 12.3 cubic yards. For a 12-foot wide driveway, it would be 14.8 yards. Add 10–15% for compaction, so order about 14 or 17 yards respectively.

What depth should my gravel driveway be?
For a new driveway, 4–6 inches of compacted gravel is standard. Use 4 inches for a light-duty residential driveway, 6 inches for heavier vehicles or poor soil. For a top-up on an existing driveway, 2–3 inches is usually enough.

How much area does one cubic yard of gravel cover?
One cubic yard covers 324 square feet at 1 inch deep, 162 square feet at 2 inches, 108 square feet at 3 inches, and 81 square feet at 4 inches. This is because 1 yard = 27 cubic feet, and 27 ft³ ÷ depth in feet gives the area.

Should I order by the yard or by the ton?
Most suppliers sell by the cubic yard, so order by volume. If a supplier quotes a price per ton, use the calculator’s ton estimate (1.4 tons/yd³) as a guide, but confirm the exact weight per yard for the specific gravel. Ordering by the ton can be more accurate if the gravel is wet, since water adds weight.

Can I use the calculator for pea gravel or river rock?
Yes, the volume calculation is the same for any loose material. However, the ton estimate may be off because pea gravel and river rock are lighter (about 1.2–1.3 tons/yd³). Adjust the ton factor accordingly or just use the cubic yard figure for ordering.

How do I handle a curved or irregular driveway?
Break the driveway into smaller rectangles and triangles. For a curved section, approximate it with a series of straight segments or use the average width. Calculate each section separately, add the volumes, then add 10–15% for waste and compaction.

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in l | Length | ft | 50 | 0
in w | Width | ft | 10 | 0
in d | Depth | in | 4 | 0
out yards | Cubic yards | yd³ | (l * w * (d / 12)) / 27 | 2
out feet | Cubic feet | ft³ | l * w * (d / 12) | 1
out tons | Estimated tons | tons | ((l * w * (d / 12)) / 27) * 1.4 | 2