Coffee contains almost no calories. But I'm talking about plain black coffee.
One cup of black coffee contains about two calories and one espresso that is 30 ml contains about one calorie. Where did the calories and coffee come from? All that milk, sugar jaggery, whipped cream, chocolate sauce, and caramel sauce all add up to an actual large Frappuccino can have up to 700 calories.
So, if you just want to be healthy. If you're following a certain diet and you don't want to break the fast, a cup of coffee is going to do no harm to you.