This study explores the development of lightweight foamed concrete (LFC) for structural applications, with a focus on the influence of mix design parameters on its physical and mechanical properties. More than twenty different mix designs were prepared by varying the water-to-cement ratio, metakaolin (MK) content, superplasticizer (S.P.) dosage and maximum fine sand particle size. Specimens with three distinct target dry densities (1350, 1500, and 1650 kg/m³) were produced and evaluated in terms of flexural strength, compressive strength, and elastic modulus. Additionally, microstructural analysis was conducted to examine pore structure and matrix homogeneity. The experimental results indicate that for the densities investigated in this work, compressive strength reached up to 57.21 MPa, while flexural strength peaked at 8.19 MPa.