The Capacity varies from 40 L to 850 L. For a couple, a 150-250 L refrigerator is recommended. The Whirlpool 190 L 3-Star refrigerator might be a good choice for you. For a family with 2-3 people, 200-300 L is recommended. LG 260 L or Samsung 253 L double-door refrigerators are suitable for such a situation. If you belong to a family with members of more than 3, you need a bigger fridge with a capacity of more than 300 L. Haier 320 L refrigerator is perfect for 3-4 users.