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Gravel calculator

Cubic metres and tonnes of gravel for a path, driveway or base, from the length, width and depth. Order by whichever your yard sells in.

m

m

mm

%

The answer

To order 1.5 tonnes
To order 1.0 m³
Exact volume, before the allowance 0.90 m³
Area 18.00 m²
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Two jobs, worked out

Volume = length x width x depth, in metres, plus the allowance. Tonnes = that volume x 1.5, rounded up to the next tenth of a tonne. The 1.5 t/m³ is Australian Native Landscapes' indicative compacted bulk density for its gravels, read 9 October 2026.

A garden path

15 by 1 m, 50 mm deep
Length 15 m
Width 1 m
Depth 50 mm
Extra for settling and spillage 10 %
To order 0.9 m³
Exact volume, before the allowance 0.75 m³
Area 15.00 m²
To order 1.3 tonnes

A gravel driveway

12 by 3 m, 100 mm deep
Length 12 m
Width 3 m
Depth 100 mm
Extra for settling and spillage 10 %
To order 4.0 m³
Exact volume, before the allowance 3.60 m³
Area 36.00 m²
To order 6.0 tonnes

The gravel only. Road base under it is a separate line and a separate depth.

Gravel questions#

How do I convert cubic metres of gravel to tonnes?
Multiply by the gravel's bulk density. This calculator uses 1.5 tonnes per cubic metre, the indicative compacted figure Australian Native Landscapes publishes for its gravels (read 9 October 2026). Different stone, sizes and moisture weigh differently, so ask your supplier for theirs.
How deep should gravel be?
Paths are commonly 50 mm, driveways 75 to 100 mm over a compacted base. Anything carrying vehicles needs the base right first.
How much gravel for a path?
A path 15 m long and 1 m wide at 50 mm is 0.75 m³. With 10% extra that is 0.825 m³, about 1.3 tonnes.
Why order more than the exact volume?
Gravel compacts and spreads at the edges. The allowance box adds 10% by default.