Light-weight concrete is often used in structures for soundproof and insulation. The determination of mechanical properties of this material is an important issue in the bearing capacity assessment, durability, and construction cost. This paper presents a procedure for determining mechanical properties of the light-weight concrete using Keramzit aggregates based on a series of experiments. The difference between mechanical properties of the light-weight concrete and normal concrete with the same compressive strength has identified. A relationship between the compressive strength and the volumetric mass density of the light-weight concrete has been proposed. Moreover, other mechanical properties of the compressive strength at 28 days of the light-weight concrete are investigated, and a comparison with those of previous studies is also conducted in this work.