The CDC reports a standard drink should contain approximately 0.6 ounces of pure alcohol. For refernece, that level of pure alcohol is commonly found in these formats[12]:
For drinks containing 5% alcohol (most beers), 12 ounces is one serving
For drinks containing 7% alcohol (malt liquor), 8 ounces is one serving
For drinks containing 12% alcohol (wine), 5 ounces is one serving
For drinks containing 40% alcohol (distilled spirits), 1.5 ounces is one serving