I'm having a hard time believing that anyone who knows their recommended calorie allowance would think that they would have to consult a registered dietician or professional nutritionist to find out the calories in maple syrup, particularly when that information is generally available (and by law in the U.S.) on the side of the maple syrup container. But just in case you are on the level, and really do not know how to calculate calories, here is a chart that will answer all of your questions. :)