Calorie Cup is a web based Starbucks calorie calculator for the United States menu. It lets users choose a drink and size, then estimate how changes to milk, syrup pumps, espresso shots, and supported toppings affect calories, sugar, fat, protein, and caffeine. The calculator covers 20 drinks and includes standard recipe estimates for available sizes. Users can start with a drink’s standard recipe, select a size, and adjust supported ingredients to compare the resulting estimate with the original. The tool also provides information about how size, milk, syrup, and espresso choices affect a drink. For example, a larger cup may contain more milk without having more espresso shots, and an iced drink may contain less milk than its hot counterpart. Nutrition values are estimates rather than verified Starbucks figures. Milk swaps use Horizon and Oatly nutrition labels as proxies, syrup estimates use a Torani vanilla model, and espresso, foam, and whipped cream use stated portion assumptions. The model keeps estimated milk volume constant when users change syrup pumps or espresso shots. Powders, sauces, drizzle, decaf, and some toppings are not editable, and menu availability may vary by café.