Sand, dirt, gravel and even concrete is measured by the cubic yard and each cubic yard is 1 unit. therefore 1 unit of sand = 27 cubic feet Hence 1 unit of sand = .772 cubic meters

Each 60 pounds bag of ready mix concrete will make .45 cubic foot of concrete. There are 27 cubic feet in a cubic yard. You will need 60 bags of 60 pound premixed concrete to make 1 cubic yard.

A yard is 91.44 cm One cubic yard is 91.44x91.44x91.44=764554.857984 cubic cm, or .765 cubic meters. Concrete and sand are often measured in cubic yards. In metric countries it is measured in cubic meters. Roughly there are 1.3 cubic yards in a cubic meter.