Stone Calculator — Landscape & Decorative Stone

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How this is calculated

The depth in centimetres is divided by 100 to convert to metres, then multiplied by the area to give volume in cubic metres. The volume is then multiplied by the stone's typical loose bulk density to get the weight in kilograms, which is divided by 1000 to give tonnes — the unit suppliers use for larger orders.

Bulk densities used are typical published values for loose material: crushed granite ≈ 1 650 kg/m³, river pebbles ≈ 1 550 kg/m³, limestone chippings ≈ 1 400 kg/m³, slate chippings ≈ 1 400 kg/m³, marble chips ≈ 1 500 kg/m³, and lava rock ≈ 900 kg/m³. Actual density varies with particle size, moisture content and source, so order 5–10% extra as a margin. If your supplier sells in 25 kg bags, the calculator rounds up to the nearest whole bag.

A 5–10 cm layer is typical for decorative garden mulch or path edging. Deeper layers (10–15 cm) are used for drainage purposes or areas with heavy foot traffic. If you enter a price per tonne, the estimated material cost is shown. Prices are editable estimates — check with your local supplier for current rates.