If you are 5' 1 and weigh 139 lbs and need to lose 20 lbs how many carbohydrates per day should you eat?

For a low carb diet the usual range is 20 to 50 grams daily. The best way is to experiment and discover what amount works well for you as an individual. Unlike protein and fats, there is no minimum daily requirement for carbohydrate in order to flourish physically.