French Drain Gravel Calculator
French Drain Gravel
Calculate gravel needed for a french drain installation.
Formula
Tons = (Length x Width x Depth / 12^2) / 27 x 1.4
Frequently Asked Questions
What type of gravel is best for french drains?
Use washed 3/4 inch crushed stone or river rock for best drainage.
How deep should a french drain be?
A french drain should be 18 to 24 inches deep for proper function.