Pea Gravel Calculator

How to Calculate Pea Gravel Needed?

Multiply the area length by the width (in feet) to get square footage. Multiply the square footage by the depth in feet to get cubic feet. Divide by 27 for cubic yards. A pathway 30 feet long, 4 feet wide, and 2 inches deep needs 30 x 4 x 0.167 = 20 cubic feet = 0.74 cubic yards. Pea gravel weighs approximately 2,500 pounds per cubic yard, so 0.74 yards weighs about 1,850 pounds or 0.93 tons. The calculator above converts your area and depth into cubic yards, tons, and number of 50-pound bags for easy ordering.

What Is Pea Gravel?

Pea gravel consists of small, naturally rounded stones approximately 3/8 inch in diameter, roughly the size of a pea. The stones are smooth and oval because they have been tumbled by water over thousands of years in riverbeds and glacial deposits. Colors range from tan, brown, and gray to white, rust, and mixed earth tones depending on the source quarry. Unlike crushed angular stone, pea gravel does not interlock when compacted, which makes it comfortable to walk on but unsuitable as a structural base. Its rounded shape also means it migrates more easily than angular gravel and needs edge containment to stay in place.

How Deep Should Pea Gravel Be?

Walkways and garden paths: 2 inches provides adequate coverage over landscape fabric. Patios and seating areas: 2-3 inches creates a stable, comfortable surface. Driveways (not ideal, but possible): 3-4 inches minimum. Drainage beds: 6-12 inches around perforated pipe. Ground cover around plants and trees: 2-3 inches. Playground surfaces: 6-9 inches for fall protection (though engineered wood fiber is often preferred for playgrounds). Going too shallow allows the fabric or soil below to show through. Going too deep makes walking feel unstable as feet sink into the loose stones.

Pea Gravel vs Crushed Stone: When to Use Each?

Use pea gravel for decorative ground cover, walkways, dog runs, drainage beds, and between stepping stones. The smooth surface is comfortable barefoot and gentle on pet paws. Use crushed stone for structural bases under pavers, concrete, and foundations. Angular crushed stone interlocks under compaction, creating a stable, load-bearing surface. Pea gravel does not compact firmly and shifts under vehicle weight, making it a poor driveway base. For areas that need both appearance and stability, consider decomposed granite or crushed limestone, which provide a natural look while compacting more firmly than pea gravel.

How Much Does Pea Gravel Cost?

Bulk pea gravel costs $30-$55 per ton or $35-$60 per cubic yard delivered from a landscape supply yard. Bagged pea gravel at home centers costs $4-$6 per 50-pound bag, which works out to roughly $160-$240 per ton. The bulk price advantage is significant: a 1-ton bulk delivery at $45 replaces about 40 bags that would cost $160-$240. Delivery charges range from $50-$150 per truckload. For projects under 0.5 cubic yards, bags are more convenient despite the higher per-unit cost. For anything larger, bulk delivery saves substantial money.

How to Install Pea Gravel Properly?

Mark the project area and excavate to the desired gravel depth plus 1 inch. Compact the exposed soil with a hand tamper or plate compactor. Lay commercial-grade landscape fabric over the compacted soil, overlapping seams by 6 inches. Secure the fabric with landscape staples every 12 inches along the edges and seams. Install edging (metal, plastic, or stone) around the perimeter to contain the gravel. Spread pea gravel evenly to the desired depth using a garden rake. Unlike crushed stone, do not compact pea gravel with a plate compactor as this can damage the rounded stones and push them into the fabric. The gravel will settle naturally over the first few weeks of foot traffic.

Does Pea Gravel Need Edging?

Yes, edging is essential. Pea gravel migrates easily because the smooth, round stones roll rather than lock together. Without a border, the gravel spreads into lawn areas, garden beds, and neighboring surfaces within weeks. Steel landscape edging (1/8-inch thick, 4-inch tall) provides a clean, nearly invisible border that holds gravel effectively. Plastic bender board is a budget-friendly alternative. Natural stone, brick, or timber borders create a more decorative edge. The edging should rise at least 1/2 inch above the finished gravel surface to contain the top layer of stones that tend to scatter from foot traffic, raking, and rain splashing.

Pea Gravel Maintenance

Rake pea gravel surfaces every few weeks to redistribute stones displaced by foot traffic and maintain an even depth. Remove fallen leaves and organic debris before they decompose and create a soil layer that encourages weed growth. If weeds appear, pull them or spot-treat with a non-selective herbicide. Top up with fresh gravel every 1-2 years as the surface thins from displacement and settling. The landscape fabric beneath prevents most weeds, but seeds that land on top of the gravel can germinate in accumulated dust and organic matter. Keeping the surface clean and raking regularly minimizes this issue significantly.

Frequently asked questions