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Gravel Calculator

Gravel, shingle or hardcore for a driveway or path, in cubic metres, tonnes and bulk bags.

Enter values

Results update as you type.

Result

Gravel required

2.25 tonnes

A decorative gravel layer is usually 40–50 mm deep; a driveway sub-base needs 100–150 mm of compacted hardcore beneath it.

Volume
1.5 m³
Area covered
30 m²
Bulk bags (850 kg)
3
25 kg bags
90
Cost
$112.50

About the Gravel Calculator

Gravel, shingle or hardcore for a driveway or path, in cubic metres, tonnes and bulk bags.

Also known as: how much gravel do i need, driveway gravel calculator, shingle calculator, hardcore calculator, stone chippings.

How to use this calculator

  1. Enter area shape, depth, bulk density, price per tonne and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

tonnes = area × depth × bulk density ÷ 1000

Worked example

Using the values pre-filled in the calculator above:

  • Area shape: Rectangular
  • Length = 10 m
  • Width = 3 m
  • Depth = 50 mm
  • Bulk density = 1,500 kg/m³
  • Price per tonne = 50

the calculator returns:

  • Gravel required: 2.25 tonnes
  • Volume: 1.5 m³
  • Area covered: 30 m²
  • Bulk bags (850 kg): 3