Well, it depends on what kind of ranch dressing, and how much you use, but in Kraft Ranch dressing, there are 15.6 grams of fat per 2 tablespoons. That equates to roughly 54% fat.
Prices can range where you get it or if you making it yourself, or if you buy from a bag. If you go with the Deli fresh in you local market pre made, it will run under $5 in a restuarant it is best...