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How many glasses of champagne you get from one bottle depends on  the size of the bottle. You can get six glasses from a 750-mL  bottle. A magnum is equal to two bottles andâ¦ a rehoboam is equal to  six bottles.
As a general rule, allow half a bottle per person then add a margin for safety. A standard sized bottle of wine (75cl) will provide 6 small wine glasses (125ml). So one case of wine (12 bottles) will provide 72 glasses. So for 100 guests you'll need 100 x 3 glasses = 300 glasses, or 50 bottles.