Gravel Calculator

Enter area and desired depth. It calculates volume, adds a compaction allowance, and converts to cubic yards and approximate tons/bags.

Enter dimensions and depth, then press Calculate

Length	ft
Width	ft
Depth	in
Compaction/waste allowance	%

Result

Your result will appear here.

How it works

Area × depth gives volume. Convert inches to feet, cubic feet to cubic yards (divide by 27). Add compaction/waste allowance. Weight depends on stone type and moisture.

Formula

Volume (cu ft) = length(ft) × width(ft) × (depth(in)/12)

Cubic yards = (cu ft / 27) × (1 + allowance%)

Tons ≈ cubic yards × 1.4 (typical crushed stone)

Worked example

20×10 ft at 4 inches deep: 200 sq ft × 1/3 ft = 66.67 cu ft = 2.47 cu yd. At 10% allowance ~2.72 cu yd, ~3.81 tons.

Assumptions

Uses typical crushed gravel density (~1.4 tons/cu yd). Bag coverage varies. Loose vs compacted volume differs.

Reading the result

For driveways, consider a stable base and compaction. Get your supplier's exact tons-per-yard for the product you're ordering.

For general information only. Actual needs depend on material, compaction and site conditions.

How to use the Gravel Calculator

It takes a few seconds, and every figure is calculated in your browser.

Enter the length.
Enter the width.
Enter the depth.
Enter the compaction/waste allowance.
Press Calculate — the result appears in the dark panel beside the form.
Use Copy, CSV, Share or Print under the result if you want to keep it.