Gravel Calculator
Estimate gravel volume and tonnage for paths, drainage trenches and landscaping projects.
Gravel Calculator
Estimate gravel volume and tonnage for paths, drainage and landscaping.
Estimating Gravel Volume And Tonnage
Gravel is commonly used for garden paths, drainage trenches and general landscaping fill. This calculator works out volume as area (m²) × depth (m), then converts that to tonnage using a typical compacted gravel density of 1.65 tonnes per cubic metre.
What Information You Need To Enter
Enter your project area in square metres and the depth in millimetres.
Understanding Your Results
You will see the gravel volume required and the approximate tonnage. Actual density varies by gravel type and particle size, so treat this as a solid planning estimate to confirm with your supplier for larger orders.
Why Accurate Estimating Matters
Gravel is typically sold by the tonne, so an accurate estimate helps you avoid ordering too little (leaving a project unfinished) or too much (paying for material you do not need).
Frequently Asked Questions
What depth of gravel do I need for a path?
A typical garden path uses 50 mm to 75 mm of gravel over a compacted base, though this varies depending on expected foot traffic and the base preparation underneath.
Does gravel type affect the density used?
Yes, different gravel types and particle sizes compact to slightly different densities. This calculator uses a typical reference figure of 1.65 tonnes per cubic metre; your supplier can confirm the exact density for your chosen product.
Is this the same as crushed rock?
Gravel and crushed rock are often used interchangeably in casual conversation, but can refer to different products depending on your supplier. See our Crushed Rock Calculator if you specifically need a sub-base material for a driveway or slab.
Do I need a base underneath the gravel?
For paths and driveways, a compacted base is generally recommended before laying gravel to prevent it sinking or becoming uneven over time. For drainage applications, gravel is often laid directly with geofabric.
Can gravel be used for drainage behind a retaining wall?
Yes, drainage aggregate is a common application for gravel. See our Concrete Sleeper or Timber Sleeper Retaining Wall calculators for drainage quantities specific to a retaining wall project.
Related Calculators & Services
Need An Exact Price, Not Just An Estimate?
The Gravel Calculator gives you a fast, useful planning figure. For a fixed, accurate price backed by a site assessment, request a free professional quotation from HPL Construction.
