A standard bottle of champagne (750 ml) typically serves about 6 glasses of champagne, based on a standard serving size of 125 ml (4 fluid ounces) per glass. However, the number of glasses can vary depending on the size of the glass and how generously the champagne is poured, with estimates ranging from 6 to 8 glasses per bottle for typical servings. Larger bottles like magnums (1.5 liters) will provide about 12 glasses, doubling the standard bottle serving amount.