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Landscape Volume Calculator

Site area calculations. How much do I need?
Use our volume calculator here to find out approximately how much soil, pebbles, or mulch you will need. Please note, these calculations are based on basic shapes, and not on the unusual shapes that gardens can take. It is meant as an indicator only. Please call us for one of our Estimators to visit your site. NB. Landscapers refer to the tips further down for podiums and urban gardens

  1. Look at the space and decide what shape it is most like.
  2. Choose that shape in the volume calculator
  3. Measure the length in metres
  4. Decide on how deep you need to go with the product and enter that. The depth is in cm for mulch. Please enter it in cm for soil as well.
  5. You can add more than one site are to the volume calculator
  6. If you have any trouble, give us a call on 1300 BLOWIT and we will help you with your order.

Tips for ordering landscape material

Tip 1: Weight vs Volume
Some products are sold in Tonnes and some in Cubic metres. Most heavier landscape materials such as aggregates, pebbles and sands are sold by the tonne, so you will need to convert to a cubic metre for all area and depth measurements on site. Most lighter products are sold per cubic metres such as mulches and lightweight soils. No conversion rate is needed to understand how far they will go on your job site.
Tip 2: Measuring garden or site areas
See below for helpful instructions on how to calculate various shapes in your garden for mulching and soil jobs. Generally a square is an easy enough step, but if you have unusual shapes, there are some mathematical tips below to help you out.
Tip 3: For contained podium environments
When measuring volumes for contained environments, make sure you allow for the material to settle in the first couple of weeks. This means over order slightly from volume on truck to volume after settling. This tip applies to all delivery methods as settling occurs regardless of product type or delivery method.
Tip 4: Bulk Density and Saturated Bulk Density
Some sites have every sensitive weight limits. Bulk Density is the value of the material when completely bone dry. Saturated Bulk Density is the value when the material is completely soaked through. Both values are essential to know when using growing media in contained environments and should be calculated professionally to ensure engineering weight limits are adhered to.

Calculation Formulas:

Square or Rectangle
 (Length x Width x Depth)
The area of a square or rectangular garden is easy to calculate.
Simply multiply the length by the width by the depth or use our simple volume calculator.

Circular πr2 x Depth
Circular areas are also easy to calculate.
Simply multiply 3.1415 (π) by the radius, by the radius again, by the depth ~ or use our simple volume calculator.

Choose shape:

Square: Length x Length x Depth

Rectangle: Length x Width x depth

Circle: πr² ie. 3.1415….x half the diameter x half the diameter x depth

Semicircle: πr² ie. 3.1415….x half the diameter x half the diameter x depth ÷ 2