On average, a gallon of ice cream will serve approximately 16 people a 1 cup serving of ice cream and 10 people a 1 1/2 cup serving of ice cream. A scoop of ice cream is about 1/2 cup (4 ounces), and a typical serving is about three scoops, or 1 1/2 cups (12 ounces) of ice cream.
The amount of servings per gallon of ice cream depends on the serving size, and the size and tastes of those eating them. When planning on serving ice cream, it's important to take into consideration the ages and sizes of those who will be eating it. Children will eat less than adults, and everyone may eat less ice cream if it is served after a meal, or as a banana split, a sundae or with toppings. A serving of fudge or other ice cream sauces is about 1/4 cup per serving. Toppings like nuts, sprinkles, candy or fruit are about 1/4 to 1/3 cup per serving. According to the FDA, actual serving sizes are larger as of 2014 than they were when serving size guidelines first came out, making it difficult to make an accurate assessment of servings per container as listed on the label.