Using the Widmark formula, as breath alcohol testing machines do internally, and mechanically, you can calculate the anticipated blood alcohol level one would expect from consuming a certain amount of beer, wine, or hard liquor. One can also calculate how many drinks of different types of intoxicant, it would take to elevate one’s blood alcohol level to a given number. Constants are built into this well-accepted formula, to account for physiological differences between men and women, and between heavier and thinner people.
Rather than drag you through a complex mathematical formula, I am instead providing a link below, which should give you a quick approximation as to the blood alcohol level you can expect from drinking various amounts of beer, wine, or spirits.
It is in no way exact, and be advised that this approximation is not legal advice, nor will it hold up in court. However, it gives a pretty fair approximation of what your blood alcohol will be. Simply enter your weight, gender, what type of alcohol you drank, the amount of alcohol drunk, and how long you had been drinking, from start to finish.