Estimate guide
Start from the job: a walkway, patio base, driveway, and drainage trench do not share the same depth. Pick the depth first, then estimate cubic yards and tons from that choice.
Four inches is a strong quick-planning default when the project is neither purely decorative nor obviously heavy-duty.
Visible top layers often stay closer to 2 to 3 inches than to a full structural base depth.
Driveways, deeper bases, and drainage sections can move well beyond 4 inches depending on the design.
Some projects need one depth for the visible finish and another for the structural base, so the planning choice has to be deliberate.
Bulk material settles differently across use cases, which is why overage and depth usually need to be considered together.
A walkway, patio base, driveway, and drainage trench can all share gravel but still demand very different planning depths.
Area alone does not answer the order. Depth decides the volume, and density decides how the same volume turns into tons.
Start by deciding whether the gravel is a light surface layer, a base, a driveway section, or a drainage detail.
The calculator converts the footprint and depth into cubic feet and cubic yards before any density assumptions are applied.
Once the volume is right, density helps translate that quantity into the rounded tons you can actually order.
Choose the depth that matches the intended use before you turn volume into tons.
| Project type | Typical planning depth | Reason |
|---|---|---|
| Walkway surface | 2 to 3 inches | Often lighter than a load-bearing base and more appearance-driven. |
| Patio or paver base | 4 to 6 inches | Base work usually needs more mass than a simple decorative layer. |
| Driveway | 4 to 8 inches or more | Vehicle traffic drives the order well beyond a basic path estimate. |
| Drainage trench | Varies widely | The trench section and drainage detail matter more than the surface footprint alone. |
A 12 by 24 foot area at 4 inches with 10% overage needs 105.6 cubic feet, or 3.91 cubic yards. At 1.4 tons per cubic yard, the order rounds up to 5.5 tons.
The same footprint at 6 inches would raise the order materially, which is why the depth choice is just as important as the density setting.
Use the guide to choose a depth, then turn that decision into cubic yards and tons.