Gravel Calculator
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Gravel Calculator: How Much Gravel Do You Need?
Ordering the right amount of gravel is critical — too little means a second delivery fee, too much means paying for material you'll never use. Our free gravel calculator takes your area dimensions and desired depth and instantly tells you how many cubic yards or tons of gravel you'll need, plus a full cost estimate including labor, tax, and delivery. Whether you're building a driveway, a walkway, or a drainage bed, this tool removes the guesswork before you order.
How the Gravel Calculator Works
Gravel volume depends on the length and width of the area you're covering, plus how deep you want the layer to be. Driveways typically need 4–6 inches of depth, while walkways and decorative beds often use 2–3 inches. Our calculator converts your square footage and depth into cubic yards (or cubic feet, if you're comparing bagged gravel), then multiplies by your local price per yard to give you a full cost estimate — including labor time, sales tax, and delivery fees.
Why This Calculator Has an Adjustable Waste Buffer
This calculator applies the adjustable waste buffer on top of your raw calculated volume. Gravel compacts significantly once it's spread and driven or walked on, and real-world surfaces are rarely perfectly flat or perfectly rectangular — this buffer accounts for compaction, uneven sub-grade, and spillage during spreading, so you don't run short mid-project and have to schedule a second delivery.
If your project has a very clean, level base or you'd rather order closer to the exact number, you can adjust the waste buffer percentage directly on this calculator — set it anywhere from 0% to 50% to match your comfort level. Lowering it will reduce both the material estimate and the total cost shown.
Gravel Depth Guide (By Project Type)
| Project | Recommended Depth | Notes |
|---|---|---|
| Walking path | 2 inches | Pea gravel (3/8") is easiest underfoot |
| Decorative bed | 2–3 inches | Often laid over landscape fabric |
| Driveway base | 4–6 inches | Crushed stone, compacted in layers |
| Drainage / French drain | Fills trench depth | Wraps perforated pipe for water flow |
How Much Does a Ton of Gravel Cover?
One ton of gravel covers roughly 100 square feet at a 2-inch depth. One cubic yard of gravel weighs approximately 2,400 to 3,000 pounds (1.2 to 1.5 tons) depending on the stone type and moisture content — our calculator works in cubic yards so you can convert to tons using your supplier's specific weight-per-yard figure.
Frequently Asked Questions
How deep should a gravel driveway be?
Most residential gravel driveways use a total depth of 4 to 6 inches, typically built in layered lifts of crushed stone for a stable, well-compacted base.
How many cubic feet are in a cubic yard of gravel?
One cubic yard equals exactly 27 cubic feet. Bulk gravel is usually sold by the cubic yard, while bagged gravel is sold by the cubic foot.
How much does a cubic yard of gravel weigh?
Most gravel weighs between 2,400 and 3,000 pounds per cubic yard — about 1.2 to 1.5 tons — depending on the stone type and how wet it is.
What size gravel is best for a driveway?
Crushed stone from 3/4 inch to 1 inch is the standard choice for driveways since it compacts well and holds up under vehicle traffic.
What is a good waste buffer for gravel?
5-10% is a practical range for compaction and spreading loss. Simple, flat, well-prepped areas can stay near 5%, while sloped or irregular sites often belong closer to 10%.
Should I use landscape fabric under gravel?
Landscape fabric helps block weeds and keeps gravel from sinking into the soil beneath it. It's not required for every project, but it's commonly recommended for walkways, decorative beds, and many driveways.
Related Calculators
Planning a full landscaping project? These calculators pair well with gravel:
Mulch Calculator — estimate mulch for beds and borders alongside your gravel paths.
French Drain Calculator — figure out drainage needs for the same yard drainage areas.
Pavers Calculator — plan the base gravel and paver quantities for a patio or walkway.