Calculate the volume and weight of gravel, sand, or crushed stone needed to cover an area at a given depth.
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This tool calculates the volume and weight of sand, gravel, or crushed stone needed to cover a given area at a specified depth — a common calculation when preparing a ground base before paving, filling a base layer under outdoor tiles or walkways, or decorating garden areas with decorative gravel. The volume is calculated by multiplying the ground area by the required depth converted to meters, then converted to an estimated weight in tons using the density of the selected material, since sand, gravel, and crushed stone have similar but not identical densities that depend on particle size, moisture content, and how tightly the material is compacted. Knowing the resulting weight is practically useful because most building material suppliers sell and deliver these bulk materials by the ton or by the truckload rather than directly by cubic meter, meaning the weight figure — not just the volume — is usually what's needed to actually place an order with a supplier.
It might seem more intuitive to order sand or gravel by volume — after all, the practical question is usually 'how much space do I need to fill' — but the construction materials trade almost universally sells and prices these bulk materials by weight instead, which means converting your volume calculation into weight is a necessary practical step before actually placing an order.
The reason for weight-based pricing comes down to how these materials are transported and handled: trucks, loaders, and scales all measure and are rated by weight capacity, not volume, making weight the natural unit for the entire supply chain from quarry to delivery. A supplier quoting a price 'per cubic meter' would need to make assumptions about material density and moisture content that vary between batches, whereas weight is a direct, unambiguous physical measurement.
Density itself varies more than many people expect between different bulk materials: dry sand, wet sand, pea gravel, crushed stone, and larger aggregate all pack differently and contain different amounts of air space between particles, resulting in meaningfully different weight for the identical volume. This is exactly why a generic 'gravel weighs X' assumption can be off by a noticeable margin if the actual material differs from what was assumed.
Getting the depth measurement right matters just as much as getting the area right, since volume scales directly and linearly with depth — doubling the intended depth exactly doubles both the volume and the resulting weight and cost. Base layers for different applications call for meaningfully different depths (a decorative garden gravel layer needs far less depth than a structural base layer under a driveway meant to bear vehicle weight), so using the correct depth for the specific application is as important as the area measurement itself.
It's generally wise to round up slightly beyond the exact calculated figure when ordering bulk materials like these, since spreading material evenly to an exact target depth across an entire area in practice is harder than the calculation assumes — minor unevenness in the base ground surface means some spots naturally consume more material than others to reach a level, uniform final depth, and running short partway through a delivery is considerably more inconvenient than having a small, usable surplus.
Yes, it's common practice to add 5-10% extra to account for compaction (loose material settles once spread and compacted) and minor spillage during delivery and placement.
Density varies by material composition and particle size — crushed stone and gravel are typically slightly denser than sand, though the differences are relatively small.
A common range is 10-15 cm for a compacted gravel base layer under pavers or patios, but always check your specific project's engineering requirements for load-bearing areas.