A cubic yard of concrete weighs approximately 4,000 pounds (1,814 kilograms), with variations depending on factors such as the mix design, aggregate density, and moisture content. Concrete density ranges from 140 to 160 pounds per cubic foot (2,240 to 2,560 kilograms per cubic meter), and concrete strength is measured in pounds per square inch (MPa) or newtons per square millimeter (N/mm²).