You save when you buy soil and mulch in bulk. However it is not always easy to know how much you need. Here you will find what we recommend and how to calculate.

The formula

Cubic metre (m3) is the measurement we use for bulk:

Width x length x depth = volume

Example – Top dressing: Your lawn is 15 metres wide and 8 metres long. We recommend a 15 mm layer of top dressing. 15m x 8 m x 0.015m = 1.8m3


Buy in cubic metre (m3) or scoops

  • 0.25 m3 = 1 scoop
  • 0.5 m3 = 2 scoops
  • 0.75 m3 = 3 scoops
  • 1 m3 = 4 scoops


Buy in Big Green Bag

  • 1 Big Green Bag = 0.76 m3
  • 1/2 Big Green Bag = 0.38 m3

We deliver Big Green Bag with a truck and forklift so we can leave the bag anywhere on your property (where our forklift can get to).


What depth do you need?

  • Top dressing = 10-15 mm / 0.010-0.015m
  • Mulch = 75mm / 0.075m
  • Underlay (for grass) = 50-100mm / 0.05-0.10m
  • Planting soil (garden beds) = 300mm / 0.3m
  • Conditioning existing soil with cow manure = 50-100mm / 0.05-0.10m


Your one stop shop

We are professional landscapers and horticulturalists. We can help you with lawns, plants, landscaping supplies and more.

Give us a call at 4954 6999, send this form or come in to store and we will help you.

Lee Rowans Gardenworld is a member of LSA and are experts on turfs and how to take care of your lawn. Visit

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Contact us

Drop in or give us a call today.

Warners Bay (Head Office)

381 Hillsborough Rd, Warners Bay NSW 2282, AUSTRALIA Get Directions

Mon – Sat: 7am – 5pm

Sun: 8am – 4pm

Public Holidays: 8am – 4pm

Central coast

Deliveries 6 days a week to Central coast.

Mon – Sat: 7am – 5pm

Sun: 8am – 4pm

Public Holidays: 8am – 4pm

Weston (Bulk Supplies)

78 Lumby Lane, Sawyers Gully NSW 2326 Get Directions

Mon – Sat: 7am – 3pm