I might also help decide what level of bubbly to use. Number of Guests Number of Bottles 90 15 22 100 16 24. Champagne Toast Calculator And Event Drinks Guide Plato Hire How many bottles of champagne do you need for a champagne toast. . There are 36 ounces in each. Aluminum Cans American Beer Can Size. Wedding receptions traditionally include a champagne toast. 750ml is just over 25 ounces. For a Champagne toast the math is a little different since you only need to pour about a third of a glass for a toast. Six glasses of champagne are provided by one bottle of champagne. One bottle of champagne provides 625 servings at 4 ounces per pour How Much Champagne To Buy Chart. Accordingly plan on one bottle of bubbly for every ten guests. The serving size is 25. While a champagne flute of champagne for a toast is 4 ounces. For a toast you should aim for seven glasses. You can buy 25 bottles of ch...