Calculate Tons for Circles of Sand, Gravel or Limestone. Calculate Tons of Compacted Gravel or Limestone. Phone: 847-223-7000 / Fax: 847-223-7067. Length in feet x Width in feet x (Depth in inches x 12.22). Take the total and divide by 2000 (the amount pounds in a ton). The final figure will be the estimated amount of tons required.