Typically, 750ML which is a little over 25 ounces.
Standard sized Champagne bottles are 750 millilitersYou have to convert ounces to milliliters1 milliliter = 0.033 fluid ounces.0.033 X 750 = approx. 24.75 fluid ouncesPatrickwww.winepine.com
750ml in a champagne bottle
About 25.
Approximately 27.5 ounces.
25.3 fl oz