How is the gravel weight estimated?

Volume in cubic metres is multiplied by a typical loose-gravel bulk density of about 1.6 tonnes per cubic metre. Density varies by stone type and moisture, so treat the tonnage as a guide.

What depth of gravel should I use?

Around 40–50mm suits a decorative path, while a driveway sub-base is often laid thicker. Enter the depth your project calls for and the volume updates instantly.

How much gravel do I need for a driveway?

Multiply length × width × depth. For example a 10 m × 4 m driveway at 50 mm depth is 40 × 0.05 = 2 m³, about 3.2 tonnes of loose gravel.

How many tonnes is one cubic metre of gravel?

Roughly 1.6 tonnes per cubic metre for typical loose gravel. Wet or denser stone can weigh more, so order a small margin over the estimate.

Can I enter the area in feet?

Yes. Switch the area units to feet and the tool converts to metres internally (1 ft = 0.3048 m) before computing the volume. Depth is always entered in millimetres.

How do I convert the result to cubic yards?

The tool shows cubic yards automatically by multiplying cubic metres by 1.30795. So 2 m³ is about 2.6 cubic yards.

Is anything uploaded?

No — all calculations run entirely in your browser and nothing is sent anywhere.

Gravel Calculator — Gera Tools

This calculator turns an area and depth into the amount of gravel (aggregate) you need to buy. Enter the length and width in metres or feet and the depth in millimetres, and it returns the volume in cubic metres plus estimates in tonnes and cubic yards — useful for paths, driveways, borders and sub-bases.

How it works

The tool converts your inputs to metres, multiplies them for a volume, then applies fixed density and unit factors:

volume (m³) = length (m) × width (m) × (depth_mm ÷ 1000)

tonnes = volume × 1.6 (typical loose-gravel bulk density)

cubic yards = volume × 1.30795

If you enter the area in feet, each dimension is first multiplied by 0.3048 to convert to metres. Depth is always taken in millimetres.

Example

For a path 10 m long, 2 m wide, at 50 mm depth:

volume = 10 × 2 × 0.05 = 1.0 m³
weight = 1.0 × 1.6 = 1.6 tonnes
cubic yards = 1.0 × 1.30795 = 1.31 cubic yards

Depth	Volume (10 × 2 m)	Tonnes
40 mm	0.8 m³	1.28 t
50 mm	1.0 m³	1.6 t
75 mm	1.5 m³	2.4 t

The weight assumes a typical loose-gravel density of about 1.6 t/m³; actual density varies by stone and moisture, so order a small margin. Everything runs in your browser and nothing is uploaded.