Carb grams/day range*: 259–455 grams. Carb grams/meal range (3 meals per day): 86–151 grams. *Based on 45%–65% of calories from carbohydrate. Note: Men who are under 65 years of age, moderate to large in stature, at a healthy weight, and get a lot of exercise may need more calories and grams of carbohydrate.arb grams/meal range (3 meals per day): 60–103 grams. *Based on 45%–65% of calories from carbohydrate. Note: Women who are under 65 years of age, moderate to large in stature, at a healthy weight, and get a lot of exercise may need more calories and grams of carbohydrate.