This depends on your need for cooking. Usually, stockpots come in different sizes between 8 quart to 36 quart, and some commercial kitchens also use a massive 74 quart version. If you want to buy it for home use, it can range from 8 quart to 20 quart. However, an ideal size for home kitchens tasks to make big batches of stock or sauce would be a 12 quart stockpot.