How to use the calculator. Select your drink size, drink type, and milk type from the dropdown menus. Enter the number of syrup pumps (if any) in the ‘syrup’ field. Webhow to use the starbucks drink calorie calculator. This calculator helps you estimate the number of calories in your starbucks drink. Simply follow the steps below: Webthe only calorie calculator that lets you really see whats in your custom starbucks latte. Start with your favorite drink. Search starbucks menu, and our user submitted drink Webwelcome to the starbucks nutrition calculator…