Question: one beer is how many units of alcohol?
Answer: Stronger beer (6–12%) may contain 2 units or more per half pint (imperial). A half-litre (500 ml) of standard lager or ale (5%) contains 2.5 units. One litre (1000 ml) of typical Oktoberfest beer (5.5–6%) contains 5.5–6 units of alcohol. A beer bottle is typically 333-355ml, approximately 1.7 units at 5%.