Then multiply this percentage by the total number of carbs in the entire recipe to get the number of carbs in your portion. You would need to transfer the food from its cooking pan to another container for which the scale has been zeroed. Then zero the scale again for your plate or bowl and measure the food into that. Again, make a note on the recipe telling you what the serving size is and how many grams of carbohydrate are in one serving. Then, the next time you make the recipe, you won't have to go through all the weighing procedures again.
Carbohydrate factors give the amount of carbohydrate in one gram of a particular food.
It is easy to figure the carbohydrate factor for any food using a scale which is set to read in grams. Divide the number of carbs for the total recipe by the weight in grams to get the amount of carbohydrate in one gram. This is the carbohydrate factor for that food. Then, weigh your individual portion and multiply the weight in grams by the carbohydrate factor. Again, making notes on the recipe will save you the tedium of weighing the entire recipe each time you make it.