Calculate how many cubic meters and tons of gravel or crushed stone you need for a driveway, path or drainage, based on length, width and depth.
Volume is calculated the same way as other flat-area quantity calculations — length × width × depth, when depth is converted from centimeters to meters:
Gravel and crushed stone typically weigh around 1.6 tons per cubic meter, depending on grain size and moisture. A standard bulk bag holds roughly 0.8 tons.
A typical build-up has several layers: a base layer of 15-20 cm coarser crushed stone, and a top layer of 3-5 cm finer gravel. This calculator computes one layer at a time — run it again for each layer.
Gravel has rounder grains and is often found naturally, while crushed stone is quarried rock with sharper edges that locks together better — common in base layers under roads and driveways.