I'm sure it all depends on which one you get. They are large, so I'm sure they have a TON of calories. You don't go to a place like this if you are worried about calories.
They are served in a typical mason jar sized mug, with a lot of toppings overflowing from the top. I would say you could expect a minimum of 800 calories to start, but they could easily top 1,000 depending on what you choose. They use Blue Bell ice cream, so that might give you an idea of where to start.
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