For a family of four, a 5-quart air fryer should be more than enough. Of course, families and cooking habits vary, so you may find yourself looking for a larger fryer as well. Don’t worry, if 5 quart models aren’t enough for you, there are always extra large fryers.  These are intended for the biggest groups of people and social gatherings, however they can also be useful for the average family that just likes to cook a lot and doesn’t want to waste any time.  Generally, these fryers range between 6 and an astounding 16 quarts — though the latter size is almost certainly overkill and it’s mostly used in commercial places like restaurants.