How much carbohydrates should you take a day?

The 2010 Dietary Guidelines for Americans recommends that carbohydrates make up 45 to 65 percent of your total daily calories. 

So, if you get 2,000 calories a day, between 900 and 1,300 calories should be from carbohydrates. That translates to between 225 and 325 grams of carbohydrates a day.

Info source: http://www.mayoclinic.org/carbohydrates/ART-20045705?p=1