Best answer: Do you measure carbs before or after cooking? Best answer: Do you measure carbs before or after cooking? August 17, 2022 by eatwithus. Table Of Content show. When you count carbohydrates in foods that you cook, you will need to determine the part of food after preparing it. For instance, cooked long grain rice has 15 grams of carb per 1\/3 cup. If you consume a cup of prepared long grain ...