ABV

[cask is best]

Hi all just started my Coopers dark ale for Christmas. On the instructions page 3 titled Determining alcohol content it says take the OG which i did and after trying to look what it was through the froth it looked around 1040 to 1045 so we will say 1042 for arguments sake as that is what it says on the instructions. I obviously have not done the FG reading yet but lets assume it's 1006 as per instructions now you take the OG 1042 from the FG 1006 which is 36 then divide that by 7.46. then add 0.5 which gives you a volume of 5.3.
Question is where does the 7.46 come from. I have used the abv calculator on the calculators section and it comes out at 5.2 so near as damn it the same. I was just wandering why the 7.46 is used. It won't be but it seems a random number to me.

 

[Aleman]

It is just a number that gets applied to do the conversion,

In actuality it is not a constant as it depends on the original starting gravity. There is a Chart on HMCE site that tells you which constant to plug in to do the 'correct' conversion

 

[cask is best]

:thumb: ThanksAleman

 

[Wolverine]

% alcohol = (( 1.05 x ( OG - FG )) / FG )   / 0.79 
That's how I learned to do it before I found the calculator on this site

You way seems alot easier ha ha