Figuring Gravel for Your Driveway: Tons, Yards, and Cost

Figuring Gravel for Your Driveway the Right Way

Most driveways, whether the final surface is asphalt, concrete, or gravel itself, start with a compacted gravel base underneath. Figuring gravel correctly before you order matters just as much as figuring asphalt does, since ordering too little means a soft, uneven base, and ordering too much means paying for material sitting unused in your yard.

The gravel calculator above separates finished project volume from material ordering volume. Area multiplied by finished depth gives the compacted target volume. For standard materials, the calculator then applies a small material specific settlement or compaction allowance, adds your selected extra material percentage, converts the resulting order volume to weight using a loose bulk density, and divides by 2,000 to get US tons.

Gravel Estimator Yards: How Much You Actually Need

A gravel estimator in yards is often more useful than tons when you are ordering from a landscaping supplier, since many sell gravel by the cubic yard rather than by weight. The calculator above shows both the finished project volume and the estimated order volume, so the cubic yard figure does not quietly treat compacted and loose material as if they were the same thing.

Geometrically, one cubic yard covers 108 square feet at a 3 inch depth before any settlement, compaction, or extra material allowance. With the calculator defaults, a roughly 800 square foot driveway at a 4 inch finished depth comes out to about 14 to 18 tons depending on the selected gravel type. Treat that as a planning estimate and confirm the quarry or supplier conversion before placing a bulk order.

How to Calculate Gravel Yardage by Hand

If you want to calculate gravel manually, first multiply length by width to get square feet. Next multiply by finished depth in feet to get the compacted target volume. If the material will compact during placement, increase that volume by an appropriate allowance before ordering. Then add any extra material you want on site, multiply the order volume by the supplier's bulk density, and divide pounds by 2,000 to get US tons.

The built in values are planning defaults, not universal material properties. The calculator uses about 100 pounds per cubic foot for loose crushed stone with a 5% settlement and compaction allowance, 96 pounds per cubic foot for pea gravel with no automatic compaction allowance, and 105 pounds per cubic foot for loose crusher run with a 15% allowance. If your supplier provides a project specific placed density, choose Custom Placed Density and use that value instead. ASTM C29/C29M distinguishes loose and compacted bulk density and notes that stockpile, hauling, and moisture conditions can affect mass to volume relationships. See ASTM C29/C29M for the standard bulk density test method.

Gravel Base Depth for Different Projects

• Walkways and light foot traffic: 2 to 3 inches
• Standard residential driveways: 4 to 6 inches
• Driveways with poor native soil or heavier vehicles: 6 to 8 inches
• Base layer under asphalt or concrete: 4 to 8 inches, depending on local frost depth and soil conditions

If you are planning to pave over this gravel base with asphalt, our asphalt tonnage calculator picks up exactly where this one leaves off, letting you figure the surface layer once your base is squared away.

Frequently Asked Questions

How much gravel do I need for a driveway?
Measure your driveway's length and width in feet, enter the finished target depth, select the closest material type, and run those numbers through the calculator above. The required tonnage depends on area, depth, material density, compaction, and the extra material allowance, so confirm your supplier's density before ordering.

How many tons of gravel are in a cubic yard?
There is no single conversion that is correct for every gravel product. Bulk density changes with gradation, moisture, and whether the material is loose or compacted. The calculator uses transparent planning defaults and supports a custom placed density when you have supplier data.

What depth of gravel should I use for a driveway base?
Most residential driveway bases use 4 to 6 inches of compacted gravel. Heavier vehicle traffic or poor native soil may call for a deeper base, sometimes 8 inches or more.