Gravel Calculator

This calculator helps you determine the volume and weight of gravel, sand, or other aggregates needed for your landscaping or construction project.

How to Use

1. Calculate area: Measure the length and width of your space and multiply to get area in square meters (m²).
2. Choose depth: Determine the desired depth in millimeters. Common depths are 50mm for paths, 100mm for driveways, or 150mm+ for drainage.
3. Select material: Choose your aggregate type from the dropdown. Each material has a specific density that affects the weight calculation.
4. Adjust for compaction: If you're compacting the material, use a compaction factor of 1.2 (order 20% more to achieve final depth).
5. Add waste factor: Include 10-15% waste for typical projects to account for spillage and uneven surfaces.
6. Get volume and weight: The calculator shows both cubic meters (m³) and tonnes so you can order in either unit.

Material Density Explanation

Different aggregates have different densities, which affects how much weight you'll need for a given volume:

• Light materials: Scoria (~0.8 t/m³) is lightweight and used for drainage
• Medium materials: Sand and pea gravel (~1.5-1.6 t/m³) are common for general use
• Heavy materials: Gravel and crushed stone (~1.8 t/m³) provide stability
• Very heavy: Road base and compacted materials (~2.0 t/m³) are used for load-bearing applications

Formula

Volume: Area (m²) × Depth (m) × Compaction Factor × (1 + Waste %)
Weight: Volume (m³) × Density (t/m³)