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Pea Gravel Calculator

Calculate how much pea gravel you need for a garden bed, path, or drainage area.

Result

Pea Gravel Needed
0.93 cu yd
Approx. Weight
1.2 tons

Pea gravel is lighter and more rounded than crushed stone, weighing roughly 1.3 tons per cubic yard - it's popular for decorative garden beds, drainage areas, and informal paths due to its smooth texture, but tends to shift more underfoot than angular crushed stone.

About the Pea Gravel Calculator

Pea gravel is a smooth, rounded stone commonly used in decorative garden beds, drainage areas, and informal paths. This calculator estimates how much pea gravel is needed to cover a given area at a chosen depth, converting the result into both a volume and an approximate delivered weight.

How It Works

Enter the area to cover in square feet and the desired depth in inches, with 2 inches set as the default. The calculator converts depth to feet, multiplies by area to get cubic feet, divides by 27 for cubic yards, and multiplies the cubic yardage by 1.3, a bulk density figure reflecting pea gravel's lighter, more rounded stone compared to angular crushed stone, to estimate the weight in tons.

depth(ft) = depth(in) / 12; volume(cu ft) = area x depth(ft); volume(cu yd) = volume(cu ft) / 27; weight(tons) = volume(cu yd) x 1.3

Formula & Methodology

To work through by hand: convert your gravel depth from inches to feet, multiply by the square footage for cubic feet, divide by 27 for cubic yards, then multiply by 1.3 to estimate the tonnage a supplier would deliver.

Examples

Default Garden Bed

At the default 150 square feet and 2-inch depth, the volume comes to about 0.93 cubic yards, weighing approximately 1.20 tons.

Wider Gravel Path

For a 400 square foot path at a 3-inch depth, the volume works out to roughly 3.70 cubic yards, or about 4.81 tons.

Advantages

  • Converts a simple area and depth input into both a volume and a weight figure, matching how suppliers typically quote gravel.
  • Uses a density factor specific to pea gravel rather than a generic aggregate weight, reflecting its lighter, rounded composition.
  • Handles any custom depth beyond the 2-inch default, useful for deeper drainage applications versus thin decorative coverage.

Common Mistakes

  • Applying a crushed-stone density figure to a pea gravel order, which under- or overstates the actual delivered weight.
  • Underestimating depth for a drainage application, where a thin decorative layer isn't sufficient to actually move water.
  • Not accounting for the area lost to landscape edging or borders when measuring the coverage area.

Edge Cases to Watch For

  • The 1.3 tons per cubic yard figure is specific to pea gravel's rounded, lighter stone; substituting a different aggregate would need a different density factor.
  • The calculation assumes loose, uncompacted depth as measured; pea gravel can settle somewhat over time, which may call for a top-up rather than a fresh full order.
  • Area is treated as a flat open shape with no allowance for edging, borders, or landscape fabric footprint that might reduce the effective coverage area.

Common Use Cases

  • Homeowners planning a decorative garden bed or informal path.
  • Landscapers estimating material quantities for a drainage or ground-cover installation.
  • Suppliers converting a customer's square footage request into an order weight.
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

Why does pea gravel shift more underfoot than crushed stone?

Pea gravel's naturally rounded, smooth shape (from water or tumbling erosion) means individual stones roll and slide against each other easily, unlike angular crushed stone, whose jagged edges interlock and compact together - this makes crushed stone a better choice for driveways and heavily trafficked paths, while pea gravel suits decorative areas and drainage where firm footing matters less.

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Conclusion

Pea gravel's lighter, rounded composition means it needs its own density figure rather than a generic stone estimate. This calculator applies that factor directly, giving both the volume to order and the approximate weight to expect on delivery.