Cellular concrete is a preferred construction material due to its low density, cost and environmental benefits. The aim of this study was to find formulation proportions, its impact and implementation conditions on the behaviour of cellular concrete in hardened state. The study showed the importance of good workability to obtain a good quality foamed concrete, and derived the recommended marginal proportions for the target criteria using the design of experiments method. 4 factors (water/cement ratio, amounts of fine sand, superplasticizer and foaming agent) were highlighted to analyse their impact on formulation. A series of different mix designs were prepared in order to assess suitable mixes for the target properties of compressive strength and dry density. By optimizing these proportions, mechanical properties improved due to the good quality of the fresh state, which affected the hardened state. Use of superplasticizer (0,8% by weight of cement) was a major factor in achieving good paste quality. The results showed that the interaction between the w/c ratio and the amount of sand was a determining factor in obtaining good workability. Tested samples in compressive strength at 28 days and measured density were presented, those with 0.5 of w/c ratio and 40% of sand showed an average compressive strength of 7 MPa and are close to target criteria of optimization, significant factors of the experience were defined and conclusion was reached comparing with literature.