Gravel Calculator

What this gravel calculator is estimating

Most gravel projects start with a simple area and depth calculation, but suppliers often quote by cubic yard or by ton. A useful gravel calculator therefore needs to convert the project geometry into both volume and weight so the result lines up with the way bulk aggregate is usually sold.

That makes this kind of path gravel calculator or driveway gravel calculator useful for landscaping beds, drainage trenches, utility backfill, and small surfacing jobs. It gives you the raw volume, the tonnage implied by your density assumption, and a bag equivalent for smaller purchase comparisons.

Core gravel formulas

The estimate begins with project area, converts depth from inches into feet, derives cubic feet, and then converts that volume into cubic yards. Weight is calculated separately from the chosen density assumption, which is why the tonnage can change even when the project dimensions stay the same.

How to use the cubic-yard and ton results

Use the cubic-yard figure when ordering loose aggregate by volume, and use the ton figure when the supplier quotes by weight. For example, a 20 ft by 4 ft path at 2 inches deep needs about 0.49 yd³ of gravel, which is roughly 0.67 tons at 100 lb per cubic foot bulk density.

The bag count is best treated as a comparison for smaller projects because bulk gravel and bagged gravel are often priced and handled differently. If the material will compact or settle, you may need to increase the order slightly beyond the bare geometric estimate.

What this result does not cover

This calculator does not model settlement, compaction allowance, geotextile layers, edging, or multi-layer bases unless you estimate those separately. It also assumes the density you enter is a good match for the actual gravel type and moisture condition.

Use it as a gravel-order planning tool, then confirm supplier density, coverage, minimum delivery quantity, and compaction expectations before placing the final order.