How to use this estimate
Use the internal dimensions of a raised bed, excluding its timber or masonry walls. Account for drainage layers and existing fill by entering only the missing depth. Soil settles differently with composition, moisture and placement; the allowance is editable and is not a universal compaction factor.
The calculation
A worked example
A 2 × 1 m raised bed filled 0.3 m deep holds 600 L. At 10% extra, 660 L requires 17 bags of 40 L.
This estimates volume, not soil suitability or bed load capacity. Structural support for rooftop or balcony beds needs professional review.
Common questions
Does this include delivery?
No. Material cost uses your entered unit price. Add delivery, tax, access charges and minimum-order fees from the supplier.
References & method
Material volume reference. See how we check calculations. Reference links provide context; no supplier endorses this site.