Gravel Driveway Calculator: Tons Needed for Any Depth, Width & Length
Gravel driveways are the cheapest hard surface you can install — but order too little and you have ruts and mud. Order too much and you're giving gravel away to neighbors. Here's how to calculate it right, including compaction and the real depth you need.
🧮 Use Our Free Gravel Calculator
Enter driveway dimensions and desired depth — we'll calculate cubic yards, tons, and cost automatically. Supports all common gravel types.
Open Gravel Calculator →The Formula
- Measure length and width in feet. For curved driveways, measure the longest length and average width.
- Pick your depth based on use:
- Light cars only: 4 inches
- Trucks, SUVs: 6 inches
- Heavy equipment, RVs: 8 inches
- Calculate cubic feet:
Length × Width × (Depth ÷ 12) - Convert to cubic yards:
Cubic Feet ÷ 27 - Convert to tons:
Cubic Yards × 1.4(most gravel weighs ~2,800 lbs/yd) - Add compaction: Gravel compacts 10–15% when driven on. Multiply by 1.10 for light use, 1.15 for heavy.
Real Examples
Example 1: 12×50 Driveway, 4 Inches Deep, Cars Only
Area: 12 × 50 = 600 sq ft
Volume: 600 × (4 ÷ 12) = 200 cubic feet
Cubic yards: 200 ÷ 27 = 7.4 yards
Tons: 7.4 × 1.4 = 10.4 tons
With 10% compaction: order 11.5 tons
Example 2: 20×100 Driveway, 6 Inches Deep, Trucks & Equipment
Area: 20 × 100 = 2,000 sq ft
Volume: 2,000 × (6 ÷ 12) = 1,000 cubic feet
Cubic yards: 1,000 ÷ 27 = 37 yards
Tons: 37 × 1.4 = 51.8 tons
With 15% compaction: order 59.5 tons (round to 60)
Example 3: 10×30 Parking Pad, 6 Inches Deep
Area: 10 × 30 = 300 sq ft
Volume: 300 × (6 ÷ 12) = 150 cubic feet
Cubic yards: 150 ÷ 27 = 5.6 yards
Tons: 5.6 × 1.4 = 7.8 tons
With 10% compaction: order 8.6 tons (round to 9)
Gravel Types & Costs
| Gravel Type | Best For | Price/Ton |
|---|---|---|
| Crushed stone (#57, ¾") | Top layer, drainage | $30–$50 |
| Crushed stone (#2, 1½") | Base layer, heavy loads | $25–$45 |
| Crusher run / Dense grade | Base, compacts hard | $20–$35 |
| Pea gravel (⅜") | Walkways, not driveways | $40–$60 |
| River rock (1–3") | Decorative, not for driving | $60–$100 |
Base Layer vs. Top Layer
A proper gravel driveway has two layers:
- Base layer (bottom ½ to ⅔): Large stone (#2 or #3, 1–2 inches). This distributes weight and prevents sinking into soil. Use crusher run if available — it has fines that compact into a solid base.
- Top layer (top ½ to ⅓): Smaller stone (#57, ¾ inch). This creates a smooth driving surface that locks together. About 2–3 inches for cars, 3–4 inches for trucks.
💡 Pro Tip
If your driveway is on clay soil or in a wet area, add a geotextile fabric layer between soil and gravel. It prevents the stone from sinking into mud over time and can double the lifespan of your driveway. Fabric costs ~$0.15/sq ft — cheap insurance.
Common Mistakes
- Too shallow: 2–3 inches of gravel on dirt turns into mud in one season. Minimum 4 inches, ideally 6.
- Ignoring compaction:That 10 tons looks great day one. After a month of driving, it's 8.5 tons and developing ruts. Always order extra.
- Using pea gravel:Round stones roll and shift. They're fine for decoration, terrible for driveways. Use angular crushed stone.
- No edge restraint: Without timbers, brick, or metal edging, gravel spreads into your lawn within a year.
Use the Calculator
Our free gravel calculator handles all of this — including compaction adjustment, cost estimates by gravel type, and base layer vs. top layer calculations.
Last updated: August 2026
Related: Gravel Prices by State 2026