How to estimate calories in smoothies?

merechai

I go to a smoothie place that is close to my work place that is not a name brand store (like Smoothie King, etc). I know the basics of whats in my smoothie but have no idea how to calculate the calories and nutrition. I asked the woman who works there and she really didn't know but I got what I could out of her. Can anyone help?

32 oz. Smoothie
Fat-free yogurt based
With strawberry, blueberry, & guava
Added a protein boost, 'weight-loss' boost, and 'fat burner' boost.