Introduction
This stone calculator helps you figure out how much stone, gravel, or rock you need for your project. Whether you are filling a driveway, building a garden path, or covering a yard with decorative rock, this tool gives you a quick answer. Just enter your measurements, pick your material, and the calculator does the math for you.
It works three ways. You can type in length, width, and depth. You can enter a known area. Or you can start with a volume you already have. The calculator supports rectangles, circles, and ring shapes, so it handles most common layouts. It tells you the total volume in cubic feet and cubic yards, the weight in tons, and an estimated cost if you add a price.
There is also a reverse coverage tool built in. If you already bought a set amount of stone, it will tell you how deep that stone will spread over a given area. This is useful when you want to check if you have enough material before you start work.
How to Use Our Stone Calculator
Enter the size of your project area and pick your stone type. The calculator will tell you how many cubic yards and tons of stone you need and what it may cost.
Choose an Input Method: Click the Dimensions tab to enter length, width, and depth. Click the Area tab if you already know your square footage. Click the Volume tab if you already know your cubic volume.
Dimensions Tab – Shape: Pick the shape of your area. Choose Rectangle for square or rectangular spaces, Circle for round areas, or Annular Ring for ring-shaped areas like a border around a tree or fountain.
Dimensions Tab – Length, Width, and Depth: Type in the length, width, and depth of your project area. Use the dropdown next to each field to set the unit, such as feet, inches, yards, or meters.
Add Another Area: Click the Add Another Area button if your project has more than one zone. Each zone is calculated on its own and then added together.
Area Tab – Area and Depth: Enter the total area you want to cover and the depth of stone you need. Pick the correct units from the dropdowns.
Volume Tab – Volume: Enter the total volume of stone you need in cubic feet, cubic yards, or cubic meters.
Material: Select the type of stone you plan to use, such as crushed stone, pea gravel, river rock, or lava rock. Each material has a different weight per cubic yard, and the calculator uses this to figure out your tonnage.
Price: Enter the price per ton or per cubic yard to get a cost estimate. This field is optional. Leave it blank if you do not need a cost estimate.
Calculate: Press the Calculate button to see your results. The calculator shows the total volume in cubic feet and cubic yards, the weight in tons, and the estimated cost. It also gives you a step-by-step breakdown of the math and a bar chart of your results.
Coverage Estimator: Open the How deep will this cover? section at the bottom if you already have a set amount of stone. Enter how much stone you have, the area you want to cover, and the material type. The tool will tell you how deep the stone will spread.
Reset: Click the Reset button to clear all fields and start over.
Stone Calculator – Estimate Stone, Gravel & Rock for Your Project
A stone calculator helps you figure out how much stone, gravel, or rock you need for a project. Whether you are filling a driveway, building a garden path, or laying a patio base, this tool tells you the volume and weight of material to buy. It also gives you a cost estimate so you can plan your budget.
How Stone Is Measured
Stone and gravel are sold by weight (tons) or volume (cubic yards). To find out how much you need, you multiply the length, width, and depth of the area you want to cover. The calculator then converts that volume into tons using the density of your chosen material. Density is how heavy a material is for its size. Heavy, dense stones like rip rap weigh more per cubic yard than light materials like lava rock.
Common Stone Materials
- Crushed Stone – Small, angular pieces used for driveways, base layers, and drainage. One of the most popular choices. For broader gravel estimates, see our dedicated tool.
- Pea Gravel – Tiny, smooth, rounded stones great for walkways, playgrounds, and garden beds.
- River Rock – Smooth, natural stones often used for landscaping and dry creek beds.
- Rip Rap – Large, heavy rocks used to control erosion along slopes, shorelines, and ditches.
- Lava Rock – Lightweight volcanic rock popular for garden mulch and fire pits.
- Decomposed Granite – A fine, sandy material that packs down hard, ideal for paths and patios.
- Cobblestones & Boulders – Larger stones used for decorative retaining walls, borders, and accents.
How Deep Should Stone Be?
The right depth depends on what you are using the stone for. Here are some general guidelines:
- Driveways: 4 to 6 inches of crushed stone over a compacted base. If you are considering a paved surface instead, try our asphalt calculator or concrete slab calculator.
- Walkways & paths: 2 to 3 inches of pea gravel or decomposed granite. You may also want to explore pavers as an alternative surface.
- Landscaping beds: 2 to 4 inches of decorative stone or river rock. For organic beds, our topsoil calculator and soil calculator can help with fill underneath.
- Drainage areas: 6 to 12 inches depending on water flow. Use the excavation calculator to estimate how much material needs to be removed first.
- Erosion control (rip rap): 12 inches or more based on the slope and conditions.
Tips for Ordering Stone
Always order about 10% more than your calculated amount. Some material is lost during delivery, spreading, and settling. It is much easier to have a small amount left over than to place a second order. When you get a delivery quote, ask the supplier whether they price by the ton or by the cubic yard so you can compare costs correctly. If your project also involves other bulk materials, our sand calculator and dirt calculator can help you estimate those quantities alongside your stone order.