Calculate exactly how much pebbles you need for your project. Select from 40 premium pebbles options, enter your dimensions, and get an instant result.
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Pebble Depth Guide
Naturally rounded stones, perfect for decorative features, water gardens, and Japanese-style landscapes. The recommended depth varies by use:
30-50mm for decorative areas, 50-70mm for feature beds.
Multiply length × width × depth of your area. For example, a 3m × 2m area at 50mm depth needs 0.3m³, which is approximately 480kg. Use our free pebbles calculator above for exact figures based on your specific dimensions.
How deep should pebbles be?
The recommended depth depends on use: 30-50mm for decorative areas, 50-70mm for feature beds. Deeper coverage provides better ground coverage and lasts longer. Our calculator lets you adjust depth to see how it affects the total amount needed.
How much does a tonne of pebbles cover?
At 50mm depth, one tonne of pebbles covers approximately 12.5 square metres. At 30mm depth, it covers around 20 square metres. Coverage varies slightly by stone size and shape.
How do I convert pebbles volume to weight?
Most decorative aggregates including pebbles have a density of approximately 1,600 kg per cubic metre. So 1m³ weighs around 1.6 tonnes. Our calculator handles this conversion automatically.
What is the best pebbles for a driveway?
For driveways, angular pebbles in 10-20mm sizes provides the best stability and compaction. We recommend a depth of 50-70mm. Use our visualiser to preview different options in your actual driveway before buying.