How many gallons of pinto beans for 30 people?

To determine how many gallons of pinto beans to prepare for 30 people, consider that a typical serving size is about half a cup per person. This means you would need approximately 15 cups of cooked pinto beans for 30 people. Since there are 16 cups in a gallon, you would need just under 1 gallon of cooked pinto beans. It's a good idea to round up and prepare about 1 gallon to account for varying appetites.