I recently branched out into doing large stone jobs. Many houses in my area are turning to stoning the majority of their property in heavily shaded and tree covered areas. I have been having trouble estimating stone orders. Doing a search I found the followinf values 1 ton per 100 sq feet, and 150 lbs per cubic foot. Are these the most popular estimates. Also one distributor sells rock by the ton, while another sells it by the cubis yard. Is there a quick method of converting tons to yards and yards to tons? To give you an idea the last job I did used 63 tons of 3/8 red stone, 15 tons of 3/4 delaware, and 21 tons of 3" delaware. I was off on my estimation of the red stone by 12 tons, lucky I set a cushon for myself in the price.