Free calculator

Gravel & crushed stone

Order the right amount the first time. The calculator turns your area into both the finished volume and the looser quantity you actually order – compaction included – and gives the weight in tonnes for gravel, crushed stone, topsoil or sand.

Volume (finished, compacted)0 m³
To order (loose, incl. compaction)0 m³
Weight (approx.)0 tonnes

Gravel and sub-base are delivered loose and compact by ~15–25%, so you order more than the finished (compacted) volume. Density varies: gravel/crushed stone about 1.5–1.8 t/m³, topsoil about 1.2–1.5. Check with the supplier.

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An estimate, not a finished calculation – check against drawings, regulations and supplier data before pricing or ordering.

Preview of gravel & crushed stone
This is how gravel & crushed stone looks

How to work out the quantity

Diagram: gravel volume as area times thickness with a compaction allowance
Volume = area × thickness, plus an allowance for compaction.
  1. Measure the area’s length and width in metres.
  2. Enter the depth in centimetres.
  3. Choose the material’s density (t/m³).
  4. See the volume in m³ and the weight in tonnes.

Allow for compaction

Material compacts after laying, so allow a little extra if the depth must hold once the surface is settled. The calculator does this for you: the “to order” figure is the loose quantity, always larger than the finished volume.

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Frequently asked questions

How do I work out how much gravel I need?
The volume is length × width × depth in metres. A 10 × 3 m area at 10 cm depth is 3 m³. The weight is the volume times the density.
How much does a cubic metre of gravel weigh?
Gravel and crushed stone often weigh about 1.5–1.8 tonnes per m³, topsoil about 1.2–1.5. Enter the density in the calculator.
Is gravel sold in tonnes or cubic metres?
Often in tonnes on delivery and in cubic metres when estimating – so the calculator shows both.
Does it cost anything?
No, the calculator is free and requires no account.