How Deep Should Pea Gravel Be? 2026 Depth Guide by Project

Pea gravel depth depends on the project — too shallow and weeds push through, too deep and you sink with every step. For walkways and patios, 2 inches of pea gravel over a compacted base is the contractor standard. Driveways need 4 to 6 inches in two lifts. Playgrounds need a full 6 to 9 inches for fall protection. This guide gives you the depth for every common pea gravel project, the coverage formula, and how many tons or 0.5 cu ft bags you need per 100 square feet so you can order once and finish in a weekend.

Quick answer — how deep should pea gravel be?

• Walkways and garden paths — 2 inches over a 2" compacted base
• Patios and seating areas — 2 to 3 inches over a 3" compacted base
• Pea gravel driveways — 4 to 6 inches total, in two 2–3" lifts
• Dog runs — 2 to 3 inches over landscape fabric
• Fire pit base — 4 to 6 inches inside the ring, 2 inches around it
• Playgrounds — 6 inches minimum for 4 ft fall height; 9 inches for 5 ft (CPSC)
• Drainage / French drain top dressing — 2 inches
• Around pool equipment or AC pads — 3 inches over fabric

Why 2 inches is the magic number for walkable surfaces

Pea gravel is round, so it shifts under load. A layer thinner than 2 inches exposes the base material and lets weeds through; a layer thicker than 3 inches behaves like dry sand — your foot sinks, wheelbarrows bog down, and high heels disappear. Two inches of pea gravel over a properly compacted base of crushed stone (such as 3/4" minus or paver base) gives you a firm walking surface that drains fast and stays put.

Always edge it

Pea gravel migrates without containment. Steel, aluminum, plastic, or paver edging keeps the 2–3 inch layer where you put it. Skip the edging and you'll be raking the same gravel back into the path every month.

Pea gravel coverage — how much do you need?

Tons of pea gravel = (Square feet × Depth inches) ÷ 240

The constant 240 comes from the density of dry pea gravel (about 2,800 lb per cubic yard) and the conversion from inch-depths to cubic yards. The formula already rounds up slightly for compaction loss.

Per 100 square feet at common depths

• 2" deep — 0.62 cubic yard / 0.83 ton / about 33 bags (0.5 cu ft)
• 3" deep — 0.93 cubic yard / 1.25 tons / about 50 bags
• 4" deep — 1.24 cubic yards / 1.67 tons / about 67 bags
• 6" deep — 1.85 cubic yards / 2.50 tons / about 100 bags
• 9" deep — 2.78 cubic yards / 3.75 tons / about 150 bags

Depth by project (with the base layer that pros use)

Pea gravel walkway or garden path

Excavate 4 inches. Lay 2 inches of compacted 3/4" crushed stone, then 2 inches of pea gravel on top. Install edging flush with the finished surface. A 3-foot-wide × 30-foot path needs about 0.56 cu yd of pea gravel and the same amount of base.

Pea gravel patio

Excavate 5 to 6 inches. Lay landscape fabric, 3 inches of compacted paver base, then 2 to 3 inches of pea gravel. Stepping stones set into the gravel keep chairs and tables from sinking. A 10 × 12 patio (120 sq ft) at 3" needs about 1.5 tons of pea gravel.

Pea gravel driveway

Excavate 8 to 10 inches. Lay 4 inches of compacted #3 stone, then 2 inches of compacted crusher run, then a 2-inch top course of pea gravel. Some installers spec a full 4 to 6 inches of pea gravel — always apply it in two lifts and compact between them, or the car will rut the surface within a week.

Dog run

2 to 3 inches over landscape fabric. Pea gravel is paw-friendly because it's rounded; avoid crushed stone with sharp edges. Plan on a top-up every 1 to 2 years where dogs dig or pace.

Fire pit base

Inside the ring, build a 4 to 6 inch pea gravel base — it drains rainwater away from the burn area and protects the patio below. Around the outside of the ring, 2 inches is enough for the apron.

Playground

The U.S. Consumer Product Safety Commission lists pea gravel as an acceptable loose-fill surface at 9 inches compressed depth for equipment up to 5 feet tall, and 6 inches for equipment up to 4 feet. Use a containment border 4 inches taller than the gravel and rake it back under swings monthly.

The base layer matters more than the pea gravel

Almost every failed pea gravel installation traces back to one mistake — laying pea gravel directly on soil without a compacted crushed-stone base. Pea gravel doesn't lock together, so it can't bridge soft spots. Without a 2 to 4 inch base of angular crushed stone, the round pea gravel migrates into the soil, low spots become puddles, and you'll be topping up every season.

• Walkway / patio — 2 to 3" of 3/4" minus or paver base, compacted
• Driveway — 4" of #3 stone + 2" of crusher run, compacted in lifts
• Playground — 4" of drainage gravel under the loose-fill surface

Pea gravel patio cost (2026)

Bulk pea gravel runs $40 to $75 per ton delivered in most U.S. metros, plus a $75 to $150 delivery fee for loads under 5 tons. Bagged pea gravel from a home center is $5 to $7 per 0.5 cu ft bag — fine for small repairs but 4 to 6× more expensive than bulk for any patio over 50 sq ft.

• 100 sq ft patio at 3" — about 1.25 tons → $50 to $94 in gravel + delivery
• 200 sq ft patio at 3" — about 2.5 tons → $100 to $188 + delivery
• Plus base layer — roughly the same tonnage of crushed stone at $30 to $55 per ton

FAQ

How deep should pea gravel be over landscape fabric?

2 inches minimum so the fabric isn't visible at the surface, and 3 inches if foot traffic is heavy. Fabric replaces neither the base layer nor edging.

Can I lay pea gravel only 1 inch deep?

Only as a decorative top dressing over an existing hard surface. As a walking surface, 1 inch wears down to bare base within weeks.

How deep for a French drain top?

2 inches of pea gravel as the final cap, over the main washed stone fill. Pea gravel keeps soil from sifting into the drain field.

Does pea gravel need to be compacted?

No — pea gravel is round and won't compact meaningfully. Compact the crushed-stone base beneath it instead. The pea gravel layer settles naturally under foot traffic in the first week.

How many bags of pea gravel do I need per 100 sq ft?

At 2 inches deep, about 33 half-cubic-foot bags. At 3 inches deep, about 50 bags. Over 50 sq ft, bulk delivery is almost always cheaper.

The bottom line

2 inches for walkways and patios, 4 to 6 for driveways, 6 to 9 for playgrounds — always over a compacted crushed-stone base and always inside edging. Measure your square footage, pick your depth, and the formula above (or the calculator below) tells you exactly how many tons, yards, or bags to order.