A White Castle slider typically contains around 192 calories. This can vary slightly depending on the specific type of slider, as different options may have different ingredients and preparation methods. White Castle offers a variety of sliders, including classic options with cheese and those with additional toppings or flavors. For accurate nutritional information, it is a good idea to check the White Castle website or review the nutritional menu available at the restaurants. Doing so will provide detailed information about the calories and other nutritional aspects for each type of slider. If someone is planning a meal or monitoring their calorie intake, this information can be quite helpful.