How Much Gravel Do I Need?

Calculating gravel needs is similar to concrete or mulch, but with one critical difference: gravel is sold by weight (tons), not just volume. Suppliers need to know how many tons to deliver, and trucks have weight limits, not just volume limits.

The exact formula:

• Step 1: Measure length and width in feet. Multiply to get square footage.
• Step 2: Decide on depth in inches. For driveways, 4 inches is standard. For pathways, 3 inches is sufficient. For drainage, 6–12 inches may be needed.
• Step 3: Convert depth to feet (divide by 12), then multiply by area to get cubic feet.
• Step 4: Divide cubic feet by 27 to get cubic yards.
• Step 5: Multiply cubic yards by the weight factor for your gravel type. Pea gravel = 1.2 tons/yd. Crushed stone = 1.4 tons/yd. River rock = 1.5 tons/yd.
• Step 6: Add 15% for compaction and settling. Gravel compacts significantly under traffic and rain.

Example: a 20×10 foot driveway, 4 inches deep, using crushed stone. 20 × 10 = 200 sq ft. 4 inches = 0.333 ft. 200 × 0.333 = 66.7 cubic feet. 66.7 ÷ 27 = 2.47 cubic yards. 2.47 × 1.4 = 3.46 tons. Add 15% compaction = 3.98 tons. Round up to 4 tons.

How Deep Should Gravel Be for a Driveway?

Depth is the most important factor in gravel driveway longevity. Too shallow and the gravel washes away or ruts under tire pressure. Too deep and you waste money on material that never compacts properly.

• Light foot traffic (paths, patios): 2–3 inches. Enough for stability without excess material.
• Residential driveway (cars, SUVs): 4 inches. The industry standard. Provides adequate load distribution for vehicles up to 5,000 lbs.
• Heavy vehicle driveway (trucks, RVs): 6–8 inches. Required for vehicles over 6,000 lbs. Consider a geotextile fabric base layer to prevent sinking.
• French drains and drainage: 6–12 inches. The deeper the gravel bed, the faster water drains. Surround perforated pipe with 6 inches of gravel on all sides.
• Garden bed base: 2–4 inches. Prevents weeds and improves drainage under raised beds.

Pro tip: always compact in 2-inch lifts. If you need 4 inches total, spread 2 inches, compact it, then spread another 2 inches and compact again. This achieves 90–95% compaction density, which prevents rutting and washboarding.

Types of Gravel & Their Best Uses

Not all gravel is the same. The shape, size, and hardness of the stone determine how it performs underfoot and under tire.

Pea Gravel (3/8 inch, rounded)

• Pros: Smooth underfoot, attractive appearance, excellent for playgrounds and walkways, drains well
• Cons: Rolls easily under tires (not ideal for steep driveways), does not compact, can scatter into lawns
• Best for: Garden paths, playgrounds, patios, decorative ground cover
• Cost: $40–$60 per ton

#57 Crushed Stone (3/4 inch, angular)

• Pros: Compacts tightly, interlocks for stability, excellent drainage, widely available, affordable
• Cons: Sharp edges are uncomfortable barefoot, can be dusty when dry
• Best for: Driveways, base layers, drainage, construction backfill
• Cost: $30–$50 per ton

Crushed Limestone (various sizes)

• Pros: Harder than standard crushed stone, weathers to a light color, excellent compaction, naturally binds with fines
• Cons: Heavier (1.6 tons/yd), can raise soil pH over time (not ideal near acid-loving plants)
• Best for: High-traffic driveways, commercial parking lots, road base
• Cost: $35–$55 per ton

River Rock (1–3 inches, rounded)

• Pros: Decorative, smooth, multiple color options, does not compact (good for drainage), low maintenance
• Cons: Expensive, does not provide a stable driving surface, difficult to walk on
• Best for: Decorative landscaping, dry creek beds, drainage swales, erosion control
• Cost: $50–$80 per ton

How Many Tons of Gravel in a Cubic Yard?

This is the conversion that trips up most DIYers. A cubic yard is a volume measurement. A ton is a weight measurement. The conversion depends entirely on the density of the stone.

When ordering, always ask your supplier: "How many tons per yard for this specific material?" Quarry rock can vary by 10–15% depending on moisture content and mineral composition.

Gravel Cost Per Ton (2026)

Gravel is one of the most affordable hardscaping materials, but prices vary significantly by region, type, and delivery distance.

• Pea Gravel: $40–$60 per ton. Premium decorative option. Often sold in 50-lb bags for $4–$6.
• #57 Crushed Stone: $30–$50 per ton. The workhorse of gravel. Most quarries produce this as their primary product.
• Crushed Limestone: $35–$55 per ton. Harder and more durable than standard crushed stone. Common in the Midwest and South.
• River Rock: $50–$80 per ton. Decorative premium product. Price increases with color variety and size uniformity.
• Lava Rock: $60–$90 per ton. Lightweight, red or black, excellent for tropical-themed gardens. Very low density (0.75 tons/yd).
• Delivery Fee: $50–$100 per load within 10 miles. Tandem axle dump trucks carry 12–14 tons. Tri-axle trucks carry 20–22 tons.
• Minimum Order: Most quarries require a 3-ton minimum for delivery. For smaller projects, buy bagged gravel from a home improvement store.

Money-saving tip: if you need more than 10 tons, call the quarry directly instead of going through a landscaping supply yard. Quarry-direct pricing is typically 20–30% lower. You will need to arrange your own delivery truck, but the savings are substantial.

Gravel Driveway Installation: Step-by-Step

A properly installed gravel driveway lasts 10–15 years with minimal maintenance. A poorly installed one develops ruts, weeds, and washouts within a single season. Here is the professional method:

Step 1: Excavation and Grading

Remove topsoil and organic material to a depth of 6–8 inches. Grade the subsoil with a 2% slope away from buildings for drainage. Compact the subgrade with a plate compactor.

Step 2: Geotextile Fabric (Optional but Recommended)

Lay woven geotextile fabric over the subgrade. This prevents the gravel from mixing with soil, stops weed growth, and stabilizes the base. Overlap seams by 12 inches.

Step 3: Base Layer (#4 Stone)

Spread 4 inches of #4 crushed stone (1–2 inches) as the base layer. Compact thoroughly. This layer provides load-bearing capacity and drainage.

Step 4: Middle Layer (#57 Stone)

Spread 2–3 inches of #57 crushed stone (3/4 inch). Compact again. This is the main structural layer that carries vehicle weight.

Step 5: Top Layer (Optional)

For a decorative finish, spread 1–2 inches of pea gravel or crusher run fines. This creates a smoother appearance but is not necessary for function.

Step 6: Edging

Install steel, aluminum, or plastic edging along the sides to prevent gravel from spreading into lawns. Bury edging 2 inches deep and secure with stakes every 4 feet.