Gravel Calculator

About the Gravel Calculator

Gravel is one of the few landscaping materials that is bought by volume and delivered by weight. A quarry may quote you per ton, a landscape supply yard per cubic yard, and a home center per bag, while the project in your head is measured in feet or meters of path, driveway, or drainage trench. This calculator links those worlds. You enter the length, width, and depth of the area you want to fill, and it returns the volume in cubic yards or cubic meters and an estimated weight in tons or tonnes.

Volume comes first. Length times width gives the area, depth is converted to feet, and the product in cubic feet is divided by 27 to get cubic yards. In metric mode the same idea produces cubic meters. The weight then follows from a fixed density assumption: 1.4 U.S. tons per cubic yard for standard crushed gravel, or about 1.66 metric tonnes per cubic meter. The weight is not measured from your material, it is a straight multiple of the volume, which is why it is worth checking against the supplier's own figure.

People who use it include homeowners laying a garden path or a patio base, landscapers pricing a drainage bed, and anyone ordering a delivery who needs to know whether the truck can carry the load. The result describes loose material spread to the full depth you enter. It does not allow for compaction, subgrade preparation, or the separate layers that driveways and walkways often require, so treat it as the quantity for the layer you describe and plan extra for settling.

When to Use It

How to Use It, Step by Step

1. Choose U.S. or Metric at the top. In U.S. mode the area is in feet and the depth in inches, while results are in cubic yards and tons. In Metric mode the area is in meters, depth in centimeters, and results in cubic meters and tonnes.
2. Measure the Area length. For a path or driveway, measure along the center line. For a bed with curved edges, use an average length that reflects the shape instead of the longest straight line.
3. Measure the Area width across the narrowest and widest points and enter an average if the width varies. Using the widest figure can overstate the amount, particularly on a tapering shape.
4. Enter the Depth of gravel you want. The field starts at 2 inches or 5 centimeters, which is typical for decorative surfaces, while areas that carry vehicles usually need a deeper layer of compacted stone.
5. Click Calculate Gravel Needed. The tool shows the area, the volume in cubic yards or cubic meters, and an estimated weight in tons or tonnes.
6. Look at the highlighted volume line. This is the figure to compare with a supplier's price per cubic yard or cubic meter, and with the capacity of a trailer or truck.
7. Check the weight against your supplier's information. If they quote by the ton or tonne, ask about the density of the specific stone, because it can differ from the 1.4 tons per cubic yard assumption.
8. Add a margin for compaction and spillage. Gravel settles as it is walked or driven on, so ordering a little more than the calculated amount is common, then rake it level and top up if needed.

Understanding Your Results

Three lines come back. Area is length times width in square feet or square meters, so you can confirm you measured what you intended. Volume needed is the loose volume of gravel at your chosen depth, in cubic yards or cubic meters. Estimated weight is that volume multiplied by the tool's fixed density figure, shown in short tons in U.S. mode or metric tonnes in metric mode.

A quick way to sanity-check the volume is that a cubic yard covers about 162 square feet at a depth of two inches, or about 81 square feet at four inches. For metric, a cubic meter covers 10 square meters at 10 centimeters. If your result is wildly different, check that you entered inches for depth rather than feet, and centimeters rather than meters. In U.S. mode the weight in tons should be about 1.4 times the cubic yards.

To turn the numbers into an order, find out how your supplier sells the material. If they price by volume, use the highlighted cubic yards or cubic meters. If they price by weight, use the weight, but verify the density because it varies with the stone type, moisture, and size. Then think about delivery: a typical single-axle dump truck carries a limited load, and your driveway needs to handle the vehicle. Remember to add a small buffer for compaction.

More Worked Examples

Tips for Better Results

• Prepare the subgrade before the gravel arrives. Remove grass and soft soil, level the area, and compact it. A firm base keeps the stone from sinking into the ground, which would make the actual depth shallower than you planned.
• Choose the stone size for the job. Larger angular crushed stone locks together and suits driveways and bases, while small rounded stones such as pea gravel are comfortable underfoot but tend to shift and need good edging.
• Install edging along the borders of paths and patios. Without a barrier, gravel migrates onto lawns and beds over time, which wastes material and requires regular raking back into place.
• Consider landscape fabric under paths where weeds are a concern. A permeable fabric keeps the gravel from mixing with the soil beneath while still letting water through, and it does not change the volume of stone you need.
• Ask the supplier about the specific density of the product. Moisture content and the type of rock both affect weight, and a quoted figure per ton is more meaningful once you know how many cubic yards a ton actually fills.
• Spread in layers for deep installations. Placing and compacting a few inches at a time produces a firmer surface than dumping the full depth at once, and it lets you check that each layer is level.

Common Mistakes to Avoid

• Entering the depth in the wrong unit. The depth field is in inches in U.S. mode and centimeters in metric, so typing 0.5 because you were thinking half a foot gives you half an inch and a tiny volume. Check the unit label next to the depth.
• Ignoring compaction. Gravel settles under foot and wheel traffic, and the loose volume is larger than the final compacted volume, so orders for driveways and load-bearing paths often come up short without a margin.
• Treating the weight as exact. The estimate assumes standard crushed gravel, and heavier materials like trap rock or lighter ones like lava rock will weigh quite differently, so the supplier's density matters for ordering by weight.
• Skipping a base layer where one is needed. This calculator figures a single layer. A driveway often needs a coarser base and a finer top layer, so you may need to run the calculation twice with different depths.
• Forgetting how the supplier measures. Some sell by the ton, some by the yard, and some by the scoop or truckload, so confirm the unit and avoid mixing short tons and metric tonnes when comparing quotes.

Assumptions and Limits

• The volume is length times width times depth, so the area is treated as a uniform rectangle with a flat bottom and consistent depth. Slopes, curves, and uneven subgrades change the real amount, and the result is only as good as your average measurements.
• The weight uses a fixed density of 1.4 U.S. tons per cubic yard, converted to about 1.66 tonnes per cubic meter in metric mode. A U.S. ton is 2,000 pounds, and a metric tonne is 1,000 kilograms, so the two are not the same, though the tool handles the conversion for you.
• The tool does not add an allowance for compaction, waste, or spillage. Loose gravel typically settles when it is driven or walked on, so a professional order often includes a margin above the calculated number.
• This is a planning aid. For structural bases, driveways carrying heavy vehicles, drainage designs, or work near foundations, a contractor, engineer, or the material supplier should confirm the stone type, layer thicknesses, and quantities.

Key Terms

Cubic yard

A volume of 27 cubic feet, equal to a cube measuring three feet on each side. Gravel is commonly sold this way in the United States.

Short ton

The U.S. ton, equal to 2,000 pounds. It is the unit used for the weight figure in U.S. mode.

Tonne

A metric ton, equal to 1,000 kilograms or about 2,205 pounds. It is the unit used for the weight figure in metric mode.

Crushed stone

Rock that has been broken into angular pieces of a chosen size. The angular faces lock together, which makes it a stable choice for bases and driveways.

Pea gravel

Small, rounded stones about the size of peas, often used for paths and decorative areas. It is comfortable to walk on but can shift under traffic.

Compaction

The tightening of loose material as it is pressed down, which reduces its volume. Gravel placed for driveways and bases is commonly compacted to make it firm.