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Accurately calculate the volume and weight of mulch needed for landscaping and paving to avoid material waste and optimize costs.
Dimensions Input
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Choose a rectangle, circle, or triangle, enter its dimensions and a uniform spreading depth, and the calculator estimates covered area, material volume, weight, and whole bags. In US customary mode, dimensions use feet, depth uses inches, area is shown in square feet, and volume in cubic feet. The result is rounded for display.
The 2 ft³ bag capacity is a built-in assumption for imperial mode. Material affects estimated weight through one of six preset densities: mulch 400, gravel 1,500, sand 1,600, topsoil 1,200, compost 500, or bark 350 kg/m³. The estimate is not based on a particular supplier's product. UC Cooperative Extension explains the area-times-depth mulch volume method. NIST defines mass density as mass divided by volume and gives the SI unit kg/m³; see its SI guide.
Imperial lengths are converted using the international foot (1 ft = 0.3048 m exactly), and the volume is converted back for display in cubic feet. NIST lists the foot conversion factor. The tool reports weight in metric tonnes even in imperial mode.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Use rectangle for a four-sided bed, circle for a round bed, or triangle for a triangular bed. Select imperial for feet and inches.
For a rectangle, enter length and width; for a circle, enter diameter; for a triangle, enter base and perpendicular height. Enter the planned mulch depth in inches.
Choose the closest preset. This choice changes the estimated weight, while the selected dimensions and depth determine area and volume.
Read cubic feet for material volume, metric tonnes for preset weight, and the rounded-up bag estimate. Check your product label before ordering.
Example: a 10 ft by 12 ft rectangular bed at 3 inches deep has 120 sq ft of area. Three inches is 0.25 ft, so the volume is 30 cu ft. At 2 cu ft per assumed bag, the estimate is 15 bags. The displayed weight depends on the selected material preset.
Use cases
See how the tool fits into real work and everyday tasks.
Measure each bed, enter its shape and target depth, then use the cubic-foot total to compare against bag sizes printed on local product labels.
Keep the same dimensions and depth while switching between mulch, bark, compost, soil, sand, or gravel to compare the tool's preset weight estimates.
Divide an L-shaped or curved bed into rectangles, circles, or triangles, calculate each section, and add the volumes before planning the order.
Q&A
Find concise answers to common questions and confusing cases.
Bags are rounded up. A volume slightly above an exact multiple of 2 cubic feet adds another assumed bag; the result does not include an extra waste allowance.
No. Imperial bag estimates assume 2 cubic feet per bag, and weight uses the selected built-in density. For a different package size, divide the displayed volume by the label capacity and round up. Treat the weight as a rough comparison unless you have product-specific density data.
The calculator converts volume to cubic meters, multiplies by the preset density in kilograms per cubic meter, and displays the resulting mass in metric tonnes, including when dimensions are entered in feet and inches.
Notes
Review scope, result limitations, and important precautions before use.
The calculation assumes the measured area is covered evenly at one depth. It does not subtract trees, stones, edging, or existing material, and it does not model settling, compaction, moisture, or uneven ground. Measure the net area you intend to cover and use your supplier's current bag capacity and product information for an order. The calculated quantity contains no automatic allowance for waste or settling.
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