How do you calculate how many carbohydrates you should have per day?

* That rather depends on whose book you buy and whether you are trying to lose weight or not. If you are NOT trying to lose weight, it depends on your activity level. It also depends on the quality of the carbohydrates. I think the USDA has finally produced a food pyramid that makes pretty good sense, and a website that will help you with that calculation. * If you ARE trying to lose weight, 20 - 50 grams are recommended depending on your level of activity. Certain types of carbohydrate have many beneficial phytochemicals and fiber so eating some (within the allowance) is fine as long as they are not refined (processed) carbohydrates. For weight loss and health, get your carbohydrates from natural sources such as (preferably organic) fresh non-starchy vegetables and low-carb fruits such as berries. For more information, see the related question and answer, further down this page, listed under "Related Questions."