How many carbs does a jar of peanut butter have?

It is quite simple to calculate the nutritional value of a peanut butter sandwich. Simply, read the nutrition facts label on the package of bread you used, take note on what the serving size is because that denotes that the information on the package refers to that same serving. Do the same for the peanut butter, be sure to measure the proper serving size so that the nutrition label and the amount of peanut butter you used can agree on terms of nutritional accuracy. Likewise, repeat with any other thing you put in your sandwich. Simply add up the calories and carbohydrates you have calculated from each ingredient and you have the total amount in one peanut butter sandwich.