Gravel & Drainage Calculators
Aggregate by the ton for a driveway or a drain trench, including the pipe, fabric and stone depth a French drain needs to keep working.
There are 2 calculators here: Gravel Driveway Tonnage & Cost Calculator (stone tonnage, truckloads and cost for a gravel driveway) and French Drain Gravel & Rock Calculator (gravel or rock tonnage, pipe, fabric and cost for a french drain).
They all work the same way: quantity first, then a waste allowance you can change, then a price built from verified figures and adjusted for your state. Cost is always a range rather than a single number, and every assumption behind it is printed on the page with its source and the date it was last checked.