Drainage Gravel Calculator
Estimate drainage gravel for trenches, soakaways and backfill zones.
Drainage gravel for a 4m by 1m area at 40mm
For an area measuring 4 metres by 1 metres at 40mm deep, this estimate includes drainage aggregate volume and tonnage using the default density below.
- Volume0.16 m³
- Approx tonnage0.26 tonnes
- Including wastage0.28 tonnes
Results - Drainage Gravel Calculator
- Volume0.16 m³
- Approx tonnage0.26 tonnes
- Including wastage0.28 tonnes
How this drainage gravel calculator works
It converts trench or soakaway dimensions into a volume, then into tonnage using a practical drainage aggregate density.
Popular sizes
Popular pre-filled calculator pages.
Pre-filled calculator pages help visitors jump straight to a useful estimate and then refine the result if needed.