One drink is equivalent to:
-12 ounces of regular beer, which is usually about 5% alcohol
– 5 ounces of wine, which is typically about 12% alcohol
– 1.5 ounces of distilled spirits, which is about 40% alcohol
In the U.S each of the above represents approximately 14 g of ethyl alcohol.
References
NEJM 2010; 362:2102-2112
https://www.niaaa.nih.gov/alcohol-health/overview-alcohol-consumption/what-standard-drink