How many Cubic Metres.
Please take your time to browse through our website or come and see us at one of our depots nearest to your home. Central has eleven depots in the Auckland Region and one in Hamilton.

Our bulk products are sold in cubic metres (m3).

Conversion Chart for Square Metres (m2) to Cubic Metres (m3)

1 Cubic Metre (1 m3) will cover the following amount of Square Metres (m2):

Depth:                Square Metres:

10mm (1cm)       100 m2
20mm (2cm)        50 m2
30mm (3cm)        33 m2
40mm (4cm)        25 m2
50mm (5cm)        20 m2
60mm (6cm)        16 m2
70mm (7cm)        14 m2
80mm (8cm)        12 m2
90mm (9cm)        11 m2
100mm (10cm)     10 m2

Recommended Depth of Materials:
Topsoil or Lawn Mix in Lawns up to 100mm,
(depending upon finished level). 

To fill a vegetable garden with compost dig in up to 100mm.
To top dress existing beds in spring with compost or mulch 40-50mm.
To protect perennials in winter cover with compost or mulch up to 40mm.
Mulches 40-50mm;        Bark 100mm
Pebbles 40-50mm ( depending on pebble size )

Volumes:
A normal load on a standard car trailer is ½ cubic metre (0.5 m3). The weight for a 1/2 cubic metre (0.5 m3) of product can range from 150-200kg for some mulches up to 800kg for builders mix. Check your trailer and towbar for towing weights. Our standard bucket on our small loaders is ½ cubic metre (0.5 m3)

There are 14 contractor wheelbarrow loads to a ½ cubic metre (0.5 m3).

To calculate how much bulk product you require, first calculate how much area you want to cover and how deep you want the product.

Contact us and we will be happy to help you calculate the amount of product you will need or you can calculate the amount of product required using the following formulas. If you have odd shaped areas try to break it up into rectangles, triangles or circles as best as possible.

Rectangle or Square
Measure the Length by the Width in metres = Square Metres (m2)
Square Metres x Depth = Cubic Metres (m3)

Example:
Given a rectangular area of 10 metres long by 6 metres wide and you want 20mm deep of material.
Calculations: 10 m x 6 m = 60 m2
60 m2 x 0.02 = 1.20 m3 (loose measure)

Triangle
Measure the Length by the Width in metres x 0.5 = Square Metres (m2)
Square Metres (m2) x Depth = Cubic Metres (m3)

Example:
Given a right angle triangle area where one side is 10 metres long and one side is 6 metres long and you want 50mm deep of material.
Calculations: 10 m x 6 m x 0.5 = 30 m2
30 m2 x 0.05 = 1.5 m3 (loose measure)

Circle
Measure the Radius (1/2 of the distance of the diameter) in metres x Radius in metres x 3.14 = Square Metres (m2)
Square Metres (m2) x Depth = Cubic Metres (m3)

Example:
Given a circle 10 metres across (5 metres radius) and you want 100mm deep of material.
Calculations: 5 m x 5 m x 3.14 = 78.5 m2
78.5 m2 x 0.1 = 7.85 m3 (loose measure)

A loose measure is before a bobcat or tractor drives over the product which reduces the thickness. Therefore, you may also want to add 25% to allow for compaction.

It is ALWAYS wise to get more than you estimate!