Rice, maize, and sugarcane are important agricultural crops used for food production as well as fuel and industrial applications. When comparing them for ethanol production, rice leads with about 45 liters per 100 kg, followed by maize at 38 liters, while sugarcane produces around 9 liters per 100 kg depending on sucrose content. Although rice appears most productive in terms of ethanol yield, yield alone does not determine overall efficiency or profitability. Production cost creates a major difference between these crops. Rice costs approximately ₹2,008–2,050 per 100 kg, maize ₹1,797–1,860, while sugarcane is far cheaper at ₹250–320 per 100 kg. Low cultivation cost of sugarcane significantly improves economic advantage despite its lower ethanol yield over rice and maize. Biproduct utilization further strengthens sugarcane’s value. Rice residues can be used for bio-oil, biochar, activated carbon, silica extraction, green concrete, cattle feed, and mushroom cultivation. Maize supports bioethanol production, biogas generation, livestock fodder, and composting. Sugarcane, through bagasse, offers electricity generation, bioethanol, pulp and paper production, organic fertilizers, and water filtration, making it highly versatile industrially. Water requirements too differ greatly. Rice requires around 250,000–500,000 liters, maize 90,000–150,000 liters, while sugarcane is estimated at 15,000–25,000 liters per 100 kg, making it the most water-efficient option among the three. Considering ethanol yield, production cost, water efficiency, and by-product value together, sugarcane emerges as the most efficient and profitable crop overall. While rice provides the highest ethanol yield and maize offers a balanced middle ground, sugarcane’s low cost, strong industrial applications, and efficient resource use make it the best choice for long-term profitability and sustainable biofuel production. However these conditions does not determine governments priority in choosing the best input crop production for ethanol production