How many bottles of champagne do you need for a toast with 225 people?
The average bottle of champagne produces 6 servings, when served
in fluted glasses. That is a full flute. If your guests are not big
champagne drinkers, you can get by with serving half a flute: have
the servers pour as the give the glass to the guest. The bubbles
foam to the top of the glass, but when they subside, there is
really just half a glass of champagne. So, 25 bottles of champagne
serve 150 full glasses and 13 bottles serve 150 half glasses.