If you know that your food contains 47 gram carbohydrates per 100 gram
and you have eaten 65 gram of that, you are able to find out with the Carbohydrate-Calculator, how much carbs
you had in total:
Please consider that you have to
enter your exchanges and the correct conversion factor (12 for bread unit and
10 for carbohydrates) in Extras →
Settings → Language settings for an exact
result.
References