Countertop deep fryers that are marketed to consumers hold approximately 6 to 12 cups of oil. Each fryer's capacity varies widely depending on the manufacturer and appliance size. Larger deep fryers that can accommodate a turkey may require 3 gallons or more of oil.
Some deep fryer manufacturers, such as Hamilton Beach, sell deep fryers based on their oil capacity. When deciding on the appropriate size for a deep fryer, consumers should consider that a fryer should never be more than half full of food.
Cooks can reuse deep fryer oil five to six times before discarding it. They should never store used oil for longer than two weeks.