GRAVEL GUIDE • UPDATED 2026
How Much Gravel Do I Need?
Choosing the right amount of gravel for your project can be confusing. Order too little and you need another delivery. Order too much and you waste money. This guide shows you how to calculate gravel in tons, cubic yards, and cost — for any project.
Quick Answer: The Gravel Formula
To estimate gravel, multiply the area by depth to get volume, then convert to tons:
Length (ft) × Width (ft) × Depth (ft) ÷ 27 = Cubic Yards
Cubic Yards × 1.4 = Tons of Gravel
Example — a 20 × 10 ft driveway at 4 inches deep: 20 × 10 × 0.33 ÷ 27 × 1.4 ≈ 3.4 tons. Always add 10% for waste.
Use the Free Gravel Calculator
Enter your dimensions, select a material, add a price — get tons, cubic yards, bags, and cost instantly.
How to Calculate Gravel Needed — Step by Step
Gravel is a three-dimensional material. You need to account for length, width, and depth — not just area. Follow these four steps to get an accurate estimate for any project.
Measure your project area
For rectangular projects — driveways, patios, paths — measure the longest length and the average width in feet. For circular areas like fire pits, measure the full diameter.
If your project has an irregular shape, divide it into rectangles and circles, calculate each section separately, then add the areas together.
Choose the right gravel depth
Depth changes dramatically by use case. A decorative garden path needs far less gravel than a driveway that carries vehicles.
| Project Type | Recommended Depth |
|---|---|
| Garden paths & decorative beds | 2–3 inches |
| Walkways & foot-traffic paths | 3 inches |
| Patio base (under pavers) | 4–6 inches |
| Standard gravel driveway | 4–8 inches |
| Heavy vehicle driveway | 8–12 inches |
| French drain trench fill | Fill to pipe + 6 in above |
See our full gravel depth guide for project-specific recommendations.
Convert depth from inches to feet
The volume formula uses feet, but most people think in inches. Divide your depth in inches by 12.
Calculate cubic yards and tons
Multiply area by depth to get cubic feet, divide by 27 to convert to cubic yards, then multiply by the material density to get tons.
WORKED EXAMPLE — DRIVEWAY
Driveway: 40 ft long × 10 ft wide × 4 inches deep
Step 1 — Convert depth: 4 ÷ 12 = 0.33 ft
Step 2 — Cubic feet: 40 × 10 × 0.33 = 132 cu ft
Step 3 — Cubic yards: 132 ÷ 27 = 4.9 cu yd
Step 4 — Tons: 4.9 × 1.4 = 6.9 tons
Step 5 — Add 10% waste: 6.9 × 1.10 = Order 7.6 tons
How Many Tons of Gravel Do I Need?
Most gravel suppliers sell material by the ton or short ton. The conversion from cubic yards to tons depends on the material — different aggregates have different densities.
| Gravel Type | Density (tons / cu yd) | 1 Cu Yd Weighs |
|---|---|---|
| Crushed stone (general) | 1.40 | 1.40 tons |
| Dense grade / driveway base | 1.50 | 1.50 tons |
| Pea gravel | 1.35 | 1.35 tons |
| River rock | 1.25 | 1.25 tons |
| Stone dust | 1.60 | 1.60 tons |
The GravelCalc gravel calculator automatically applies the correct density when you choose a material type, so you don't need to do the conversion manually.
| Volume | Approx. Weight (crushed stone) |
|---|---|
| 1 cubic yard | 1.4 tons |
| 3 cubic yards | 4.2 tons |
| 5 cubic yards | 7.0 tons |
| 10 cubic yards | 14.0 tons |
How Much Gravel Do I Need for a Driveway?
Driveways carry vehicle loads, so they need more gravel than decorative projects. A properly built gravel driveway typically uses a compacted base layer plus a top dressing layer.
Recommended depth by traffic level:
- Light use / passenger cars: 4–6 inches total
- Standard driveway: 6–8 inches
- Heavy vehicles / trucks: 8–12 inches
DRIVEWAY EXAMPLE
Driveway: 60 ft long × 12 ft wide × 6 inches deep
Volume: 60 × 12 × 0.5 ÷ 27 = 13.3 cubic yards
Weight: 13.3 × 1.5 = 20.0 tons (dense grade)
With 10% waste: order 22 tons
How Much Gravel Do I Need for a French Drain?
French drains are different from surface projects because the drainage pipe displaces a portion of the trench volume. Simply calculating trench volume would overestimate your gravel order.
The corrected formula:
You also need to account for:
- Trench width and depth
- Pipe outer diameter
- A minimum 2-inch gravel layer above and below the pipe
- Landscape fabric, which doesn't affect volume but is always recommended
How Much Pea Gravel Do I Need?
Pea gravel is a popular choice for garden paths, playgrounds, and decorative beds. It is lighter than crushed stone — approximately 1.35 tons per cubic yard — and does not compact, so it may need edging to stay in place.
Typical application depth for pea gravel:
- Decorative garden bed: 1.5–2 inches
- Path or walkway: 2–3 inches
- Playground surface: 6–9 inches (safety standard)
Should You Add Extra Gravel?
Yes — nearly always. Even precise measurements leave room for error. Most professionals recommend a 10% waste allowance for the following reasons:
- Uneven or sloped ground increases volume slightly
- Gravel compacts under foot and vehicle traffic after delivery
- Some material is lost to spillage during spreading
- Edging voids and irregular corners consume extra material
- A small reserve covers future top-ups and repairs
How Much Does Gravel Cost?
Gravel prices vary by material type, region, quarry distance, and order quantity. The table below shows rough national averages in the United States for 2026.
| Gravel Type | Per Ton (material) | Per Cubic Yard |
|---|---|---|
| Crushed stone / #57 | $20–$40 | $28–$56 |
| Dense grade / road base | $18–$35 | $27–$53 |
| Pea gravel | $30–$60 | $41–$81 |
| River rock | $45–$80 | $56–$100 |
| Decorative / colored gravel | $50–$120+ | varies |
Delivery adds $50–$150 per load depending on distance. Use this formula for a quick cost estimate:
COST EXAMPLE
7 tons of crushed stone at $35/ton + $80 delivery
Material: 7 × $35 = $245
Delivery: $80
Total: $325
Common Gravel Calculation Mistakes
1. Forgetting the depth dimension
The most common error is calculating only area (length × width) and ignoring depth. Gravel is sold by volume and weight — you must include all three dimensions. A 200 sq ft patio at 2 inches needs a very different order than the same patio at 6 inches.
2. Confusing tons and cubic yards
Cubic yards measure volume. Tons measure weight. Suppliers may quote either unit, sometimes different units for the same job. Always confirm which unit the price refers to and convert accordingly. The gravel calculator displays both so you can match whichever your supplier uses.
3. Using the wrong density
Applying 1.4 tons/yd³ to pea gravel (actually 1.35) or river rock (1.25) will cause you to overorder. Using it for stone dust (1.6) will cause you to underorder. Select the correct material in the calculator to avoid this.
4. Skipping the waste allowance
A 10% buffer sounds like a lot until you are one wheelbarrow short of finishing the project on a weekend when the supplier is closed. Always order slightly more than your calculation — you can spread unused gravel thinly across weak spots.
Frequently Asked Questions
How much gravel do I need for a 10×10 area? +
For a 10 × 10 ft area at 4 inches deep: 10 × 10 × 0.33 ÷ 27 = 1.22 cubic yards, or approximately 1.7 tons of crushed stone. At 2 inches deep you would need around 0.6 cubic yards (0.85 tons). Use the gravel calculator to check any depth in seconds.
How many tons of gravel do I need for a driveway? +
A small driveway (20 × 10 ft at 6 inches) needs around 5–6 tons. A standard family driveway (50 × 12 ft at 6 inches) needs roughly 20 tons. A long rural driveway can need 40 tons or more. The exact amount always depends on length, width, and required depth — use the calculator for your specific dimensions.
How deep should gravel be? +
Decorative walkways need 2–3 inches. Patios under pavers need 4–6 inches of compacted base. Standard gravel driveways need 6–8 inches total (often installed in two 3–4 inch lifts). Heavy-vehicle driveways need 8–12 inches. See our gravel depth guide for full project recommendations.
Is one ton of gravel enough? +
One ton of crushed stone covers approximately 100 sq ft at 2 inches deep, or about 50 sq ft at 4 inches deep. For context, that is enough to cover a small 10 × 10 ft garden area at a decorative depth, but not enough for a driveway or large patio.
How do I convert cubic yards to tons? +
Multiply cubic yards by the material's bulk density. For crushed stone: cubic yards × 1.4 = tons. For pea gravel: cubic yards × 1.35 = tons. For dense grade: cubic yards × 1.5 = tons. Our cubic yards to tons converter handles this automatically for each material type.
What is the difference between crushed stone and pea gravel? +
Crushed stone is angular, locks together when compacted, and is used for driveways, bases, and drainage layers. Pea gravel is smooth and rounded, feels comfortable underfoot, and is used for decorative paths and garden beds — but it shifts more easily and needs strong edging. They also have different densities, which affects how much you need to order.
Ready to calculate your gravel?
Enter your project dimensions and get an accurate estimate in seconds — tons, cubic yards, bags, and total cost.