A bottle of champagne holds approximately 25 ounces. Champagne is traditionally measured in milliliters, and that is the unit that will be on the bottle's label.
A standard bottle of champagne holds 750 milliliters. Although there are many different types of beverages that call themselves champagne, the only true champagne comes from France. Anything else is more like wine with bubbles in it. The standard amount of champagne for a champagne toast in a flute is 5 ounces. This means one bottle is enough for approximately five people. A champagne toast is a tradition at wedding receptions and other formal events.