To calculate Weight Watchers points values for generic food, determine the amount of protein, carbohydrates, fat and fiber in the food, then enter them into a calculator, such as the ones on CalculatorCat.com or Calculator.net. As of 2015, most Weight Watchers programs use the PointsPlus system, which determines points values based on the nutrients present in the food rather than the amount of calories.
The Weight Watchers PointsPlus system works on the principle that the body uses more calories processing protein and fiber than it does fats and carbohydrates. Foods that are low-fat but high in protein and fiber are generally worth fewer points than foods that are higher in fats and carbohydrates. For example, a food with 3 grams of fat, 1 gram of carbohydrates, and 6 grams each of protein and fiber is worth one Weight Watchers point.
A food with 10 grams of fat, 5 grams of carbohydrates, 2 grams of protein and 1 gram of fiber is worth three Weight Watchers points. Foods that are high in fiber and contain almost no protein, fat or carbohydrates, such as dark, leafy green vegetables, are worth zero points. Weight Watchers participants may eat as much of these foods as desired.