. . . requiring brilliant mathematician. I'm going to be ordering a load of topsoil for a strip of land in my front yard next to my drive way and I need some help figuring out how much I need. Throughout the years I've been robbing dirt form this area for other parts of the yard and now I want to fill it back in so that it's the same elevation as the adjacent driveway. The area is a perfect rectangle measuring 270 inches long by 70 inches wide by 10 inches deep. That's 270"L x 70"W x 10"D or (686cm L x 178cm W x 26cm D). I think the guys at the landscape supply sell the dirt by the "yard", but I don't know if they're talking about square yards or what.