How Much Gravel Do I Need? (Free Gravel Calculator & Guide)
Ordering too little gravel means a second delivery fee and a stalled project. Ordering too much means wasted material and money. This guide walks through the simple math contractors and landscapers use to estimate gravel by area and depth, so you can order the right amount the first time — then confirm your numbers instantly with our free Gravel Calculator.
Step-by-Step: Calculating Your Landscaping Needs
- 1
Measure the length and width of your project area
Use a tape measure or measuring wheel to find the length and width of the area in feet. For irregular shapes, break the space into rectangles, measure each one, and add the areas together.
- 2
Calculate the square footage
Multiply length by width to get your area in square feet. A 20 ft by 10 ft driveway path, for example, covers 200 square feet.
- 3
Choose your gravel depth
Depth depends on how the area will be used. A decorative top-dressing needs only 2 inches, while a driveway base needs 4–6 inches of compacted gravel. See the depth guide below.
- 4
Convert square footage and depth into cubic yards
Multiply area (sq ft) by depth (in feet, so divide inches by 12), then divide by 27 to convert cubic feet into cubic yards — the unit most suppliers sell gravel by.
- 5
Convert cubic yards to tons
Gravel suppliers often price by the ton. Multiply cubic yards by an average density of about 1.4 tons per cubic yard to estimate the weight you need.
- 6
Add extra for compaction and waste
Order 5–10% more than your calculated amount. Gravel settles and compacts once spread and rolled, and a small buffer avoids a second delivery.
How Much Depth Do You Need?
| Project Type | Recommended Depth |
|---|---|
| Decorative top dressing | 2 inches |
| Walkway or garden path | 2–3 inches |
| Patio base | 4 inches |
| Driveway base | 4–6 inches |
| Drainage layer | 6–12 inches |
Gravel Coverage Reference Table (per ton)
| Depth | Approx. Coverage per Ton |
|---|---|
| 2 inches | ~120 sq ft |
| 3 inches | ~80 sq ft |
| 4 inches | ~60 sq ft |
| 6 inches | ~40 sq ft |
Get an instant estimate with the Gravel Calculator
Skip the manual math — plug in your measurements and get an instant estimate of cubic yards, tons and cost.
Frequently Asked Questions
How many tons of gravel do I need for a driveway?
For a standard 4–6 inch driveway base, most homeowners need around 1–1.5 tons of gravel per 60–80 square feet. Use the Gravel Calculator with your exact length, width and depth for a precise figure.
What is the average density of gravel?
Most crushed gravel and road base average around 1.4 tons per cubic yard, though pea gravel, crushed granite and limestone can vary. Check with your supplier for the exact density of the material you are ordering.
Should I order extra gravel?
Yes — order 5–10% more than your calculated amount to account for compaction loss, spillage, and uneven ground. It is far cheaper than paying for a second delivery.
Do I need a base layer under gravel?
For driveways and heavy-use areas, a compacted base layer of larger crushed stone under your top layer of gravel improves drainage and prevents rutting over time.