Gravel Volume and Tonnage Estimator
Select your area shape, enter dimensions, choose a material, and results update in real time. No calculate button needed.
Units:
ft
in
ft
in
ft
in
Tip: enter depth in the inches field only - e.g. 4 in for a 4-inch layer
⛏ Enter your dimensions above to see your gravel estimate.
Key Terms Explained
Aggregate
A broad term for granular materials used in construction and landscaping: crushed stone, gravel, sand, and rock. "Aggregate" is the industry word for what most homeowners call gravel or fill.
Cubic Yard
The standard volume unit for bulk materials. One cubic yard equals 27 cubic feet - picture a cube 3 feet on each side. Gravel suppliers price by the cubic yard for bulk deliveries.
Ton (Short Ton)
A unit of weight equal to 2,000 pounds. Many gravel suppliers sell by the ton rather than by volume, so converting cubic yards to tons is essential for getting an accurate quote.
Base Layer
The compacted lower layer of a driveway or path, typically 4 to 6 inches of crushed stone. The base layer provides structural support and drainage for the surface material above it.
Subgrade
The native soil beneath a driveway or path after excavation. A stable, well-drained subgrade is essential - soft or clay-heavy subgrades should be stabilized with geotextile fabric before adding aggregate.
Compaction
The process of mechanically densifying aggregate with a plate compactor or roller. Compacted gravel can shrink by 20 to 30 percent in depth, so material estimates must account for this when compacting is planned.
Pea Gravel
Small, rounded, smooth stones roughly the size of a pea (3/8 inch diameter). Comfortable underfoot and visually clean, but the round shape means it rolls and shifts - not suitable as a structural base layer.
Crushed Stone
Angular, jagged-edged fragments produced by mechanically crushing rock. The irregular shape causes particles to interlock under load, making crushed stone the preferred choice for driveways and compacted base layers.

The Complete Guide to Estimating Gravel for Driveways and Paths

Ordering the right amount of gravel is the difference between a smooth project and an expensive second delivery - or a pile of leftover material you have to deal with. Gravel is sold by the ton or cubic yard, both units measure the same material differently, and converting between them requires knowing the specific weight of the material you are buying. This guide covers the math, the materials, and the practical decisions that go into every gravel project.

How to Use This Calculator

Start by selecting your area shape. Use "Rectangular Area" for driveways, paths, and any straight-sided space. Use "Circular Area" for fire pit surrounds, round patios, and garden circles. Enter your length and width (or diameter for circular areas) using the paired input fields - the left field takes feet or meters, the right field takes inches or centimeters. This split lets you enter mixed measurements naturally without converting anything: a 12 ft 6 in path width is entered as 12 and 6, not as 12.5 feet.

For depth, the most common shortcut is to leave the feet field at zero and enter your depth directly in the inches field. A 4-inch gravel layer is entered as 0 ft, 4 in. This matches how most people think about gravel depth. Then choose your material from the dropdown and watch the results update instantly.

Understanding the Calculation

The calculator converts all inputs to feet and computes the gross volume in cubic feet. For a rectangular area: Volume (cu ft) = Length x Width x Depth. For a circular area: Volume (cu ft) = Pi x (Diameter / 2) x (Diameter / 2) x Depth. Dividing by 27 converts cubic feet to cubic yards, since 1 cubic yard = 27 cubic feet. Finally, the cubic yard figure is multiplied by the material's bulk density to produce the tonnage estimate.

The density multipliers used in this calculator are standard industry values: Standard Gravel and Crushed Stone at 1.35 tons per cubic yard, Pea Gravel at 1.40 tons per cubic yard, Masonry Sand at 1.35 tons per cubic yard, and River Rock at 1.50 tons per cubic yard. Actual values can vary by supplier, moisture content, and local stone type, but these figures are reliable for budgeting purposes.

Choosing the Right Depth

Depth is the variable most homeowners underestimate. A thin layer of gravel looks fine on day one but quickly gets displaced by foot traffic, wheels, and weather. For a pedestrian garden path, 2 to 3 inches is the practical minimum. For a residential driveway with occasional vehicle use, 4 inches is the commonly recommended depth. A high-traffic driveway or one built to last 10 or more years should use 6 inches. If your project includes a base layer of crushed stone under a top dressing of pea gravel or decorative rock, calculate each layer separately and add the results.

Remember that gravel compacts when driven over. If you plan to run a plate compactor over your base layer, add 20 to 25 percent extra to your depth input before calculating, or simply calculate at a greater depth to build in that shrinkage. The calculator gives you the volume needed to fill the space at the depth you specify before compaction.

Rectangular vs. Circular Areas

Most residential driveways and paths are rectangular and straightforward to measure. Circular areas, such as fire pit surrounds and round garden features, are common in landscape design. For a circular fire pit ring, the "diameter" is the outer diameter of the area you want to fill with gravel, not the diameter of the fire pit itself. If you are filling just the ring (not the center), you will need to calculate the full circle volume and subtract the volume of the ungraded center, which you can do by running two calculations and subtracting one from the other.

Frequently Asked Questions

For a gravel driveway that will support vehicles, 4 to 6 inches of compacted depth is the standard recommendation. A light-duty pedestrian path can use 2 to 3 inches. For a structural driveway base layer under asphalt or concrete, 6 to 8 inches of compacted crushed stone is typical. Keep in mind that loose gravel compacts by roughly 20 to 30 percent after settling and traffic, so order with that shrinkage in mind. If you are building up in layers, the bottom layer should use larger crushed stone (3/4 inch to 1.5 inch) for drainage and the top layer a finer material like pea gravel or 3/8 inch crushed stone for a smoother surface.
Cubic yards measure volume - the amount of space the material occupies. Tons measure weight - the actual mass of the material. Gravel suppliers commonly sell by the ton, while DIY bags are sold by weight. The conversion between the two depends on the material's bulk density. Standard crushed stone weighs about 1.35 tons per cubic yard. Pea gravel is slightly denser at 1.4 tons per cubic yard. River rock is the densest common option at 1.5 tons per cubic yard. This calculator converts volume to tonnage automatically based on the material you select, so you can order by either unit.
Yes. Gravel and crushed stone compact under load and over time. For a driveway or any application where the material will be compacted by a plate compactor or vehicle traffic, you should add 15 to 25 percent to your calculated volume to account for shrinkage. Loose gravel poured into a path will settle by roughly 20 percent after the first season of use. This calculator gives you the raw volume needed to fill the space at the depth you specify - if you plan to compact it, increase your depth input to account for settling, or simply add a compaction buffer on top of the calculated result.
Crushed stone, sometimes called crusher run or processed gravel, is the most common and effective material for a driveway base. Its angular, irregular shape allows the particles to interlock and compact tightly, creating a stable surface that resists shifting. Pea gravel and river rock are smooth and rounded, which makes them poor choices for a base layer because they roll underfoot and do not lock together. For the top wearing course of a gravel driveway, many homeowners prefer pea gravel or pea-sized crushed stone for its smoother texture and cleaner appearance, while the compacted crushed stone base layer provides the structural support.
A standard two-car driveway that is 20 feet wide and 50 feet long with a 4-inch gravel depth requires approximately 12.3 cubic yards of material, which translates to roughly 16.6 tons of standard crushed stone. At 6 inches deep the same driveway needs about 18.5 cubic yards or around 25 tons. These numbers do not include a compaction buffer. Use this calculator to get the exact estimate for your specific dimensions - enter your length, width, and desired depth, select your material, and the result updates instantly.
Estimates only. This calculator provides volume and tonnage estimates based on entered dimensions and standard bulk density values for each material type. Actual quantities may vary based on sub-grade conditions, compaction rate, material moisture content, supplier variability, and measurement accuracy. Always confirm quantities with your local gravel supplier before placing an order. This tool is not affiliated with any aggregate supplier.