HALP!! BAC Calculation

General Questions
#1

I need a factual answer and fast please please please (this is for an anti drink drive article in a magazine)

I know that alcohol is metablised at the rate of 0.015% BAC per hour
I also know that one standard drink = 0.02% BAC

The legal limit is 35 microgrammes of alcohol per 100 millitres of breath, or more than 80 milligrammes of alcohol per 100 millitres of blood.

So my question is - how do I convert from BAC to microgrammes / milligrammes per litre?

#2

The intent of the question? Tell people how long they have to wait once they go over the limit, and how quickly they will get to the limit

#3

I think any kind of even rough metric that is “Amount of alcohol ==> BAC” is not very useful at all. If you want a usable average try finding some sort of an average “Amount of alcohol/pound of body weight ==> BAC” table.

#4

I have found that - I have all the tables I need, but they are in BAC - I just don’t know how to get from BAC to microgrammes per milli-litre

I am reasonably competent at math, and if I can get a straight forward formula I can do the math - just need a clear formula

#5

1% BAC = 1/100 (%) g/mL = 1 cg/mL which would be 10,000 micrograms per ml.

#6

Deleted.

#7

Thanks man

Hugely appreciated - I can work it out from here

#8

Double post…

#9

That’s not quite right. You’re comparing mass and volume. 1% would be 10,000 micrograms per gram, not mL. You need to factor in for the density of blood.

Edit: Thinking about it though, it would be really close since blood is mostly water and the density of water is 1 g/mL. So depending on how accurate it needs to be, I guess this might work.