Other variables to consider

Another aspect to consider is your guest list and whether your invitees enjoy wine. Bon Appétit took the time to estimate how many glasses of wine your guests might drink based on their preferences. The general agreement? Casual drinkers may have just one glass, while wine enthusiasts who can discuss the most underrated wine regions in the U.S. might be inclined to enjoy several refills.
Remember that wine can vary in alcohol content, and higher percentages mean smaller serving sizes. Some styles can exceed 20% alcohol by volume. Fortified wines like port and vermouth can serve as digestifs to conclude a meal.
In practice, pouring wine is often a rough estimate, and variability increases when guests serve themselves. Some prefer lighter pours to swirl, aerate, and sample different bottles, while others might opt for 6 or 7 ounces to minimize trips for refills. If you're uncertain, it's wise to err on the side of caution and grab an extra bottle.
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