It is important to get to know how many units there are in the drinks you regularly consume. Check labels, ask bar staff or use the online Units Calculator from the NHS here.
Know Your Units - Online Calculator
Unfortunately you cannot just count each drink as a unit of alcohol.
The number of units depends on the different strength and size of each drink, so it can vary a lot.
As typical glass sizes have grown and popular drinks have increased in strength over the years, old rules of thumb about units have become out of date. Nowadays, a large glass of wine might well contain 3 units or more – about the same amount as a treble vodka.
The NHS has created a calculator to help you plan a night out, or help you work out how much you drank last night.