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Pea Gravel Calculator

Calculate cubic yards and tons of pea gravel for paths, patios, playgrounds, and drainage. Includes 10% settling factor.

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Enter your supplier's quote for an exact cost estimate.

How to Use This Calculator

Enter your project length and width in feet. Set the depth in inches — 2 to 3 inches for garden paths and decorative areas, 3 to 4 inches for play areas, 9 to 12 inches for playground fall-protection areas per ASTM standards. Pea Gravel is pre-selected in the gravel type menu. The result shows cubic yards for your bulk delivery order and the equivalent weight in tons. A 10% settling allowance is built into every result. For non-rectangular areas like a circular patio or a curved path, calculate each section separately using the rectangle dimensions that best approximate the shape, then add the cubic yard totals. Call your local landscape supplier with the cubic yard figure to get a price.

How to Calculate Pea Gravel

Formula: cubic yards = (length × width × depth ÷ 12) ÷ 27. Convert depth from inches to feet, multiply all dimensions together for cubic feet, then divide by 27 for cubic yards.

Example: a garden path 30 feet long and 3 feet wide at 2 inches deep. Step 1: 2 ÷ 12 = 0.167 ft. Step 2: 30 × 3 × 0.167 = 15.0 cubic feet. Step 3: 15.0 ÷ 27 = 0.56 cubic yards. Add 10% settling: 0.56 × 1.10 = 0.61 cubic yards. Round up to 0.75 cubic yards when ordering if your supplier uses quarter-yard increments.

To convert to tons: multiply cubic yards by 1.35 (pea gravel density). For 0.61 cubic yards: 0.61 × 1.35 = 0.82 tons. Compare this to bagged product cost — 50-pound bags cover 0.5 cubic feet each. At 16.5 cubic feet needed for this path (0.61 × 27), you'd need 33 bags. At $6 to $8 per bag, that's $198 to $264. Compare to bulk delivery price plus any minimum order.

Pea Gravel Tips

Always install edging before spreading pea gravel. Without physical containment, round pea gravel migrates out of paths and into adjacent lawn within the first season. Steel landscape edging at 4 to 6 inches tall is the most durable option. Plastic edging works but requires more frequent staking to prevent it from heaving out of the ground in freeze-thaw climates.

Lay landscape fabric under the gravel. A 3 to 5 oz. non-woven weed barrier prevents weeds from pushing through and keeps pea gravel from sinking into soft soil over time. Overlap fabric seams by 6 inches and pin with landscape staples every 18 inches. Weed barrier fabric costs about $0.10 per square foot — cheap insurance against annual weed pulling.

For playgrounds and play areas, the ASTM F1292 standard recommends 9 to 12 inches of loose fill material to provide adequate fall protection for equipment up to 6 feet high. A 9-inch depth uses roughly 4.5 times more material than a 2-inch decorative path. Run the calculator at 9 to 12 inches depth and compare the cubic yard figure to the equipment height in the manufacturer's fall-zone specifications before ordering.

What to Buy

For small paths and accent areas under 0.5 cubic yards: 50-pound bags from Home Depot or Lowe's are convenient and avoid delivery minimums. Buy from a single pallet to keep stone size and color consistent between bags.

For anything over 0.5 cubic yards: call local landscape suppliers for bulk delivery pricing. Most have a 1 to 2 cubic yard minimum. Specify 3/8-inch pea gravel for paths and patios, 1/2-inch for drainage applications where water flow is the priority. For playgrounds, specify certified playground-grade washed stone — it has smoother edges than standard pea gravel and meets ASTM fall-protection standards. Ask for certification documentation before installing in a public or commercial play area.

Frequently Asked Questions

How much pea gravel do I need for a 10×10 area? +
A 10 × 10 area at 2 inches deep needs 0.62 cubic yards of pea gravel before waste. With a 10% settling factor, order 0.68 cubic yards, which is roughly 0.92 tons of pea gravel. At 3 inches deep, the same area needs 0.93 cubic yards, or about 1.26 tons. Most landscape suppliers sell bulk pea gravel by the cubic yard with a 1 to 2 cubic yard minimum for delivery.
How deep should pea gravel be for a path? +
Two to three inches is the ideal depth for a foot-traffic pea gravel path. Less than 2 inches wears through quickly to the fabric or soil below. More than 3 inches becomes difficult to walk on — pea gravel at 4 inches feels loose and unstable underfoot. For playgrounds and play areas where fall cushioning is the goal, the ASTM standard recommends 9 to 12 inches of loose material.
Is pea gravel good for drainage? +
Yes. Pea gravel drains very well because of the gaps between the round stones. It's commonly used in French drains, dry creek beds, and around downspout splash pads. For a French drain trench, fill around the perforated pipe with pea gravel or 3/4-inch clean stone before covering with landscape fabric and soil. River rock works equally well for larger drainage channels.
How many bags of pea gravel do I need for a 10×10 area? +
For a 10 × 10 area at 2 inches deep, you need approximately 0.62 cubic yards. A standard 50-pound bag of pea gravel covers about 0.5 cubic feet. Total cubic feet needed: 0.62 × 27 = 16.7 cubic feet × 1.10 waste = 18.4 cubic feet. At 0.5 cubic feet per bag, that's 37 bags. For any area over 15 × 15 feet, bulk delivery is cheaper than bags.
Will pea gravel work for a driveway? +
Pea gravel alone is not a good driveway surface. The round stones roll and migrate under tire pressure and feet, creating ruts and soft spots. If you want pea gravel aesthetics on a driveway, install 4 inches of compacted angular crushed stone as the base first, then top-dress with 1 inch of pea gravel. The base does all the structural work; the pea gravel provides the look. Expect to replenish the surface layer annually.
How do I keep pea gravel in place on a path or patio? +
Install landscape edging along all path borders before spreading gravel. Steel or plastic edging at 4 to 6 inches tall prevents gravel from migrating into adjacent lawn and garden beds. For patios, use brick, concrete, or stone edging around the perimeter. Place weed-barrier landscape fabric under the pea gravel to prevent weeds from pushing through and to stop gravel from sinking into soft soil over time.
How heavy is pea gravel per cubic yard? +
Pea gravel weighs approximately 1.35 tons (2,700 pounds) per cubic yard when dry. Wet pea gravel can weigh up to 1.5 tons per cubic yard. Bulk delivery trucks typically carry 10 to 15 cubic yards per load. A single cubic yard delivery — about 1.35 tons — usually requires a one-ton pickup truck at minimum, and even then you're near maximum payload. Have bulk material delivered directly to the project site.

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