The mysterious Weights Watchers calculator is 50 calories = 12 grams of fat = 1 point. Each gram of fiber reduces the point total .2 points or 10 points.

For the mathematically adept, calorie = 0.02 pt, fat gram = 0.083 pt, and fiber (g) = -0.2.

If not mathematically adept, my apologies. If you're eating even halfway heathly, it's almost all based upon calories (if you're eating something with 12 fat grams, you're not likely watching weight too closely). Add up calories, subtract 10 calories for each fiber and add (roughly) 4 calories for each fat gram, and then divide by 50 (add a "0" on the end and divide by 2) to yield your points.