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Gravel Calculator

Calculate gravel volume in cubic yards, cubic feet and cubic meters, with an optional weight estimate from your material density.

Enter the area dimensions and gravel depth. The density field is optional: use the bulk density from your quarry, supplier or product sheet only if you also want a weight estimate.

Result

How to Use

  1. Enter the length and width of the area and choose whether those measurements are in feet or meters.
  2. Enter the planned gravel depth and choose inches, centimeters, feet or meters for that depth.
  3. Optionally add an extra-material percentage if you want the result to include a margin above the exact geometric volume.
  4. For a weight estimate, copy the bulk-density value for your specific gravel from your quarry, supplier or product data sheet and choose the matching lb/ft³ or kg/m³ unit. Do not enter the weight of a bag or truckload here. Leave this field blank if you only need volume.
  5. The result shows cubic yards, cubic feet and cubic meters. If density is provided, it also shows estimated US short tons, pounds and metric tonnes.

Formula

Base volume
volume = length × width × depth (after converting all dimensions to compatible units)
With allowance
total_volume = volume × (1 + extra_percentage ÷ 100)
Weight
weight = total_volume × material_density

Worked Example

A 20 ft by 10 ft area covered with 3 inches of gravel.

  1. Convert the depth: 3 in ÷ 12 = 0.25 ft.
  2. Volume: 20 ft × 10 ft × 0.25 ft = 50 ft³.
  3. Convert to cubic yards: 50 ÷ 27 ≈ 1.852 yd³.
  4. Convert to cubic meters: 50 ft³ ≈ 1.416 m³.

Result: Gravel volume: about 1.852 yd³ / 50 ft³ / 1.416 m³

About This Tool

What this tool does

This calculator finds the geometric volume of gravel needed to cover a rectangular area to a chosen depth, and expresses that volume in cubic yards, cubic feet and cubic meters. It can also estimate material weight when you provide a bulk density for the specific gravel you plan to buy.

When to use it

Use it for driveways, paths, landscaping beds, drainage areas and other rectangular coverage jobs where you know the area dimensions and target gravel depth.

What the result means

Cubic yards are commonly used when ordering bulk aggregate in the US, while cubic feet and cubic meters make the same quantity easy to compare with project plans or suppliers using other units. A weight result is only an estimate derived from the density you entered.

Assumptions & limitations

The area is treated as a rectangular prism with a uniform finished depth. Real sites can be uneven, compact after placement, or require more material around edges and low spots. This tool deliberately does not assume a universal gravel density: crushed stone, pea gravel and other aggregates can have different bulk densities depending on size distribution, compaction and moisture. For a weight estimate, use the density or coverage data supplied by the quarry, landscape supplier or product manufacturer you are actually buying from.

Frequently Asked Questions

How do I calculate how many cubic yards of gravel I need?
Multiply length × width × depth using compatible units to get volume, then convert that volume to cubic yards. For feet, one cubic yard equals 27 cubic feet. This calculator performs the conversions automatically.
How deep should gravel be?
The appropriate depth depends on the project, sub-base, traffic and aggregate type, so this calculator does not prescribe a depth. Enter the depth required by your project plan, contractor, supplier or local guidance.
What should I enter in the bulk density field?
Enter the bulk density for the exact aggregate you plan to buy, using the value from your quarry, landscape supplier or product data sheet. It is a density such as lb/ft³ or kg/m³, not the total weight of a bag, pallet or truckload. Leave it blank when you only need volume.
Why does the calculator not use a default gravel weight per cubic yard?
There is no single accurate density for every gravel product. Aggregate type, particle size, compaction and moisture can materially change bulk density, so a fixed default could give a misleading tonnage estimate. Use your supplier’s density when weight matters.
Should I add extra gravel above the exact volume?
An allowance can help account for uneven ground, compaction, handling losses or measurement uncertainty, but the right percentage depends on the job. The calculator leaves it at 0% unless you choose to add one.

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