1" Deep =200 Sq.Ft./Ton
2" Deep = 100 Sq.Ft./Ton
3" Deep = 65 Sq.Ft./Ton
4" Deep = 50 Sq.Ft./Ton
5" Deep = 40 Sq.Ft./Ton
6" Deep = 33 Sq.Ft./Ton
Note: For most uses 2" Deep is sufficient, unless using a grade of gravel larger than 1" size.