Beers come in different sizes, and if this question is strictly asking how many beers does it take to equal the same alcohol ingested as in a fifth (25.6 ounces (1/5 gallon) of liquor, the approximate answer would be as follows:
If drinking 12 fl oz beer, you'll need to consume about 2 bottles
If drinking 16 fl oz beer, you'll need to consume about 1½ bottles
If drinking 22 fl oz beer, you'll need to consume about 1 bottle
If drinking 40 fl oz beer, you'll need to consume about ½ of that bottle
But if this asks how many beers do you have to drink to ingest the same amount of alcohol, based on beers with 5% alc/vol against distilled spirits with 40% alc/vol, it would be:
12 fl oz beer = 17 bottles
16 fl oz beer = 12.8 bottles
22 fl oz beer = 9.3 bottles
40 fl oz beer = 5.12 bottles
In the United States, a "standard" drink is any drink that contains about 0.6 fluid ounces or 14 grams of "pure" alcohol.
See the approximate number of standard drinks in different sized containers at rethinkingdrinking.niaaa.nih.gov.
To determine blood alcohol content, use the blood alcohol level chart at dui.drivinglaws.org.
To see standard bar measurements, go to www.webtender.com.
Tip! AlcoholScreening.org shares How to Cut Down on Your Drinking.