Just found this on a Google search; For example, if you eat a 2,000-calorie diet, shoot for 225 to 325 grams of carbs per day; and if you eat 2,500 calories a day, aim for 281 to 406 grams of carbs. Adults who drop their intake to 1,200 calories a day for weight loss need about 50 percent of their calories from carbs, or 150 grams per day.
The Recommended Amount & Percent of Carbohydrates ...
http://healthyeating.sfgate.com/recommended-amount-percent-carbohydrates-per-day-7287.html