Why 1.5 tonnes per cubic metre?

It’s a typical loose-gravel density. Wet or compacted gravel can be heavier. Ask the supplier if the rate differs.

What units are the measurements?

Length and width default to metres. Depth defaults to millimetres, so 50 mm is 50, not 0.05 m.

Does this include compaction?

Not as a separate step. If the gravel will settle, keep a waste allowance on.

Gravel Calculator

How much gravel you need from the area and depth — cubic metres and tonnes.

Volume and tonnes of gravel from the area and depth you measure. Density defaults to 1.5 t/m³ for loose gravel — ask the yard if theirs differs.

Measure

Length and width default to metres. Depth defaults to millimetres — 100 mm, not 0.1 m.

Length

Width

Depth

Waste allowance

Required material

0.66 m³

You need approximately 0.66 m³ including 10% waste. Volume is length × width × depth.

Base volume: 0.6 m³
Waste: 10% · 0.06 m³
To order: 0.66 m³
Weight: 0.99 t

6 m × 2 m × 50 mm.
10% waste is included.
Uses 1.5 tonnes per cubic metre, a typical loose-gravel density.
Wet or compacted gravel can be heavier. Compaction is not calculated separately — use waste if you expect it to settle.
Confirm the order against how the supplier sells it — truck, bulk bag, or bagged.

Job summary

Area: 12 m²
Depth: 50 mm
Volume: 0.6 m³
Order: 0.66 m³

To order0.66 m³

Measurements stay in this browser. Nothing is uploaded.

Worked example

A path 6 m by 2 m, 50 mm deep, is 0.6 m³. With 10% waste that’s 0.66 m³. At 1.5 tonnes per cubic metre, that’s about 1.0 t — handy to know before you ring the yard.

FAQ

Why 1.5 tonnes per cubic metre?: It’s a typical loose-gravel density. Wet or compacted gravel can be heavier. Ask the supplier if the rate differs.
What units are the measurements?: Length and width default to metres. Depth defaults to millimetres, so 50 mm is 50, not 0.05 m.
Does this include compaction?: Not as a separate step. If the gravel will settle, keep a waste allowance on.