Bulk material calculator

Metric Gravel, Soil & Mulch Calculator

MaterialChoose a preset or edit density below.Density assumption (kg/m3)Editable assumption used to convert m3 to tonnes.

Planning assumption only; gravel density changes with stone size, moisture, and compaction.

Rectangular zones

Add each area with its own length, width, and depth.

Waste percent (%)Allows for settlement, uneven grade, and spreading variation.PackagingActual delivery packaging varies.Bag capacity (litres)1,000 litres = 1 m3.Price per bag (optional)Used only to multiply rounded bags by your entered price.

Estimate

Enter measurements and calculate to see the bulk material estimate.

Formulas and assumptions

Each zone area = length x width.
Zone volume = area x depth after converting millimetres to metres.
Waste-adjusted volume = raw volume x (1 + waste percent / 100).
Tonnes = waste-adjusted m3 x density kg/m3 / 1000.
Bags required = waste-adjusted m3 / bag capacity in m3, rounded up.

Planning estimate only. Not engineering, structural, legal, installation, or supplier advice. Check measurements, site conditions, and product labels before buying or building. Actual density and delivery packaging vary by material, moisture, compaction, and supplier.

Plan before you buy

Measure with clarity.

Start with the calculator that matches your project. Inputs and estimates stay in your browser.

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Metric-first material estimates for practical home projects. No accounts, tracking, supplier price feeds, or hidden assumptions.

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Gravel, soil & mulch calculator

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Check measurements, product labels, and site conditions before buying or building.