Gabion structures are eco-friendly gravity-retaining systems used in civil engineering projects such as highways, bridges, canal linings, buildings, and shore protection. It is made from steel wire mesh baskets filled with rocks, which help reduce carbon footprints. However, research on gabion wall performance with various standard gabion sizes is limited, leading to their underutilisation. The stability of gabion retaining walls depends on site geology, design, installation methods, environmental factors, and budget. Key design parameters include wall geometry (height, batter angle, embedment depth), soil properties, and loading conditions. Standard gabion sizes from various manufacturers are used for the analysis. The design process includes external stability checks against sliding, overturning, and bearing pressure and internal stability checks of individual gabion layers, ensuring safety factors align with permissible limits of IRC: SP 116–2018 guidelines. An analytical limit equilibrium approach is used to evaluate internal and external stability by adjusting backfill slopes (0°, 10°, 15°, 20°) and surcharge values (10, 15, 20, 40 kPa) while keeping wall height constant. Initial calculations showed that the safety factors for sliding, overturning, and bearing met the IRC guidelines. At the same time, optimisation of gabion sizes is required to meet standards for internal stability checks. It has been found that internal stability is mainly affected in lower layers, and wall stability mainly deviates from internal stability over external stability.