How much gravel for a 12 m2 garden path?

A 12 m2 garden path at 5 cm finished depth needs the volume, tonnes, and bag count shown below. For a curved path, measure the route in sections or use an average width before using this as a comparison.

How to use this project example

This example uses a 12 m2 finished area at 5 cm depth. It estimates 0.6 m3 before applying density and allowance, so it is best used as a quantity check after the finished area and depth are decided.

• Measure inside the edging line or finished border, not the rough excavation area.
• Change the depth if the project needs more than decorative coverage.
• Split irregular shapes into sections and add the results together.

Ordering checks

The example uses 1.6 t/m3 density and 20 kg bags, giving 1.06 tonnes after allowance. Supplier bag weights, moisture, and delivery options can change the practical order.

• Compare small bags with bulk bags if the bag count becomes high.
• Check delivery access and where the aggregate can be dropped.
• Keep a small allowance for edging losses, settlement, and topping up.

12 m2 garden path gravel checks

Example inputs used

• Length: 12
• Width: 1
• Depth: 5
• Aggregate density: 1.6
• Bag size: 20

These are starting values for this example. Measure or confirm your own figures, then open them in the gravel calculator.

Assumptions and limits

• Uses 12 x 1 m as a simple path shape.
• Uses a typical decorative gravel density of 1.6 t/m3.
• Includes a 10% waste and settling allowance.
• Edging and membrane choices can affect the finished area.

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