Gravel calculator

Loose material volume = area × depth × (1 + allowance ÷ 100). Estimated mass = volume × supplied bulk density.

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Area

Depth

More inputs and assumptions

Bulk density (mass per cubic unit)

Extra allowance (%)

Answer

…

Loose material volume = area × depth × (1 + allowance ÷ 100). Estimated mass = volume × supplied bulk density.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Formula and assumptions

Area and depth must use matching length units. Density is an editable example, not a claim about a material. Obtain bulk density from your supplier and allow for compaction separately.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Gravel calculator

Loose material volume = area × depth × (1 + allowance ÷ 100). Estimated mass = volume × supplied bulk density.

Area and depth must use matching length units. Density is an editable example, not a claim about a material. Obtain bulk density from your supplier and allow for compaction separately.

Next: Post hole concrete calculator

A worked example

With area = 20, depth = 0.1, bulk density (mass per cubic unit) = 1600, extra allowance (%) = 10, the material volume is 2.2.

Next: Volume calculator

Before you use the result

Area and depth must use matching length units. Density is an editable example, not a claim about a material. Obtain bulk density from your supplier and allow for compaction separately.

Example results for area

These examples use Depth: 0.1; Bulk density (mass per cubic unit): 1600; Extra allowance (%): 10. They are reference calculations, not recommended settings.

Area	Material volume
10	1.1
20	2.2
40	4.4

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