How Much Gravel Do I Need? A Simple Calculator Guide for Northwest Indiana Homeowners

Figuring out how much gravel you need before starting a landscaping project can save you from ordering too much or running short mid-job. For homeowners in Highland, IN, and across Northwest Indiana, this guide breaks down the math, the most common gravel types, and how to get the right amount the first time. Whether you are sourcing material from a Gravel Landscaping Supply Store St John IN or planning a driveway refresh in your own backyard, knowing your numbers makes the whole process easier.

The Simple Formula for Calculating Gravel

Gravel calculations follow one straightforward formula. Multiply the length by the width by the depth of your project area, then convert that number into tons or cubic yards. Most gravel suppliers sell material by the ton or cubic yard, so you need to express your measurement in one of those units before placing an order.

Here is how to work through it step by step:

▸Measure the length and width of your project area in feet.

▸Decide on your depth. Common depths are 2 inches for decorative coverage, 3 to 4 inches for pathways, and 4 to 6 inches for driveways.

▸Multiply: Length (ft) × Width (ft) × Depth (ft) = cubic feet.

▸Divide cubic feet by 27 to get cubic yards.

▸Multiply cubic yards by roughly 1.4 to convert to tons (this varies slightly by gravel type).

Example: A driveway that is 40 feet long, 12 feet wide, and 4 inches (0.33 ft) deep works out to 158 cubic feet, or about 5.9 cubic yards, or roughly 8 tons.

Always round up slightly when ordering bulk gravel. It is easier to use a little extra than to stop a project midway and wait on a second delivery.

What Type of Gravel Do You Need?

Choosing the right gravel type depends on the job. The wrong material can shift, sink, or look out of place within a season.

Pea Gravel

Pea gravel is small, smooth, and rounded. It works well for garden beds, walkways, and around play areas. It tends to shift under foot traffic, so it may need edging to stay in place.

Grade 8 Stone

Grade 8 stone is a crushed, angular material that compacts well. It is a go-to option for driveways and base layers because it locks together rather than rolling loose.

3/4" Stone

Three-quarter-inch stone offers good drainage and is commonly used under patios, around drainage pipes, and as a decorative border.

River Rock

River rock is a larger, smooth stone that works well as a decorative ground cover, in dry creek beds, or along fence lines. It is not suitable for driveways or high-traffic areas.

Limestone Screenings

Screenings are fine, dusty particles that compact into a firm surface. They are often used as a base under pavers or as a finished surface for low-traffic paths.

How Depth and Project Type Affect Your Order

The right depth changes everything about your final number. A garden bed with a 2-inch decorative layer takes far less material than a new driveway built on a 4- to 6-inch base. Underestimating depth is one of the most common mistakes homeowners make when ordering gravel.

Typical depth guidelines for common projects:

▸Decorative garden beds: 2 inches.

▸Walkways and footpaths: 3 to 4 inches.

▸Driveways (new installation): 4 to 6 inches.

▸Driveway top-dressing (refresh): 2 inches.

▸French drains and drainage ditches: 6 to 12 inches, depending on pipe size.

If your soil is soft, clay-heavy, or prone to shifting, add an inch or two to your planned depth to account for settling over the first season.

Quick Reference Chart

| Project Type | Recommended Depth | Approx. Tons per 100 sq ft |

|---|---|---|

| Garden bed | 2 in | 0.75 to 1 ton |

| Walkway | 3 to 4 in | 1.25 to 1.75 tons |

| Driveway (new) | 4 to 6 in | 1.75 to 2.5 tons |

| Driveway (refresh) | 2 in | 0.75 to 1 ton |

These figures are approximations. Material density varies by stone type, so confirm with your supplier before finalizing your order.

How Ordering Bulk Gravel in Northwest Indiana Works

Bulk gravel supply near Highland, IN, is available by pickup or delivery. For small jobs under 1 ton, some homeowners haul material in a pickup truck. For larger jobs, delivery is usually more practical. Most bulk deliveries are dropped at the end of a driveway, so have a clear space ready and a plan for spreading material the same day if possible.

Bring your length, width, and depth measurements when you call or visit a Gravel Landscaping Supply Store St John IN. Staff can review your numbers, suggest the right material, and flag any depth issues before you order.

What to Have Ready Before You Order

▸Total square footage of the project area.

▸Planned depth in inches.

▸Gravel type or intended use (driveway, path, decorative bed).

▸Whether you need pickup or delivery.

▸Any access restrictions for the delivery truck. 

Frequently Asked Questions About Gravel Quantities