Below are the nutrition facts and Weight Watchers points for 40 oz Barq's Root Beer from Arby's .
There are 450 calories in a 40 oz Barq's Root Beer from Arby's. Most of those calories come from carbohydrates (100%).
Weight Watchers Freestyle Points: 28
Weight Watchers SmartPoints: 28
Weight Watchers PointsPlus: 13