Drainage Gravel Calculator
Estimate drainage gravel for trenches, soakaways and backfill zones.
Results - Drainage Gravel Calculator
Enter your measurements and press calculate.
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
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Pre-filled calculator pages help visitors jump straight to a useful estimate and then refine the result if needed.