You'll need about
0.90
m³
900
litres exact
9
m²
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How this is calculated
length × width × depth = volume in m³ · × 1,000 = litres. The trap is depth: it is almost always quoted in millimetres or centimetres while length and width are in metres, so it has to be converted before anything is multiplied.
This is a planning estimate — always confirm against your supplier and the specifics of the job before ordering.
Cubic metre calculator: FAQ
How do you calculate cubic metres?
Multiply length × width × depth with every dimension in metres. A 5 m by 4 m area at 100 mm deep is 5 × 4 × 0.1 = 2 m³. The usual mistake is leaving the depth in millimetres — 100 mm is 0.1 m, not 100.
How many litres in a cubic metre?
Exactly 1,000. That is the figure to use when a supplier quotes bagged material in litres — a 60-litre bag of bark is 0.06 m³, so a cubic metre is about 17 bags.
How much does a bulk bag hold?
Around half a cubic metre for most aggregates, at roughly 800 kg. Bag sizes and weights vary between suppliers, so check when your order sits close to a whole-bag boundary rather than assuming.
Should I order extra?
Usually yes. Bulk material settles, ground is never perfectly level, and running short means a second delivery charge that dwarfs the extra material. Ten percent is a common allowance on fill and aggregate.
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