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Multiply your compacted cubic metres by the following to determine the loose cubic metres of material you need.
To calculate how much soil is needed for your garden bed multiply 2.8 (banked cubic metres) x 1.2 (compaction allowance). You will need 3.36 loose cubic metres. We recommend that this amount is rounded up and that you order 4.0 cubic metres to avoid running out of material.
We provide this information as a guide only. Calculation methods for different projects will vary and you may need to seek your own advice.
The following chart may also assist, though please allow for the product to settle:

