Calculate tons of gravel or cubic yards of mulch needed for paths, beds, and driveways.
Landscaping orders use different units for different materials: gravel is commonly ordered by weight, while mulch is commonly ordered by volume. This calculator combines the measured length, width, and planned depth of a path, bed, or driveway, then reports gravel in tons or mulch in cubic yards. The most frequent mistake is entering an inch measurement as though it were feet. A 3-inch layer is 0.25 feet deep, so entering 3 feet instead makes the estimate twelve times too large.
A concrete input and expected output from the current implementation.
Input
Material: mulch; Length: 12 ft; Width: 6 ft; Depth: 3 in
Expected output
0.67 cubic yards of mulch
The bed contains 12 x 6 x 0.25 = 18 cubic feet. Dividing by 27 cubic feet per cubic yard gives 0.6667 cubic yards, which rounds to 0.67.
For a rectangular project, the calculator multiplies length by width to obtain area, then multiplies that area by depth. Depth must first be expressed in the same linear unit as the other dimensions. The resulting cubic measurement represents a uniform layer, so variations in grade or thickness are not reflected unless the measurements are adjusted.
Mulch volume is converted from cubic feet to cubic yards using 27 cubic feet per cubic yard. Gravel requires another step because tons measure mass rather than volume. A gravel tonnage result therefore depends on a density value in addition to the calculated volume. Different gravel products can occupy the same space but weigh different amounts.
Dimensions determine volume, not weight. Converting that volume to tons requires the density of the particular gravel. Stone composition, grading, moisture, and how tightly the particles pack can change the conversion. If a supplier publishes a product-specific tons-per-cubic-yard figure, use that figure when reconciling the calculator's estimate with the supplier's quote.
Not necessarily. The result describes the volume or weight implied by the entered dimensions. Real projects may need extra material for an uneven base, compaction, settlement, trimming, or handling losses. The appropriate allowance depends on the site and product, so confirm the final order quantity with the installer or material supplier.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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