Why do you want to know that? Are you planning to drink a 100 juice boxes at one time? I hope you are not planning to do something like that. You will get a sugar rush that can cause bad damage to your health. If you want to know the number of calories in a juice box then you should look at the back of the box. Most juice boxes will provide information such as sugar content, calories content and fat content. Any information regarding preservatives will also be present. I hope that answers your question. (Don't drink more than 3 at a time)