[dgt20 (OP)]

ABV%= (Initial SG-Final SG)/7.46
Does that look like the correct formula to find ABV% of wine? I looked online but keep finding 3 different formulas leading to different results.

[Colin2B]

I’ve usually used 7.36 but that’s because i followed C J Berry’s methods.
The formulae are only valid for a range of alcohol content because the relationship with sg is nonlinear, in this case 11-15%.
You’ll find different one for beer which is around the 5%.
Which others did you find?

[Bored chemist]

All of the formulae are approximations, but most people are not greatly concerned if their wine is 12% or 12.2%
Most people don't measure  out a glass-full very accurately anyway.

I used to work on the basis that about half the weight of the sugar ends up as alcohol, so a must containing 20% sugar by weight would produce a wine with about 10% alcohol.

It's not very accurate- but it is very easy.

[dgt20 (OP)]

I’ve usually used 7.36 but that’s because i followed C J Berry’s methods.
The formulae are only valid for a range of alcohol content because the relationship with sg is nonlinear, in this case 11-15%.
You’ll find different one for beer which is around the 5%.
Which others did you find?

These are the two i found
ABV%= (Initial SG-Final SG)/7.36

and

ABV= (starting sg)- ( final sg)/(final sg) * 100

[Colin2B]

ABV= (starting sg)- ( final sg)/(final sg) * 100

Don’t recognise this. Looks like a bit missing, I would expect to find a fractional multiplier ie divider, for the rhs equation

[dgt20 (OP)]

ABV= (starting sg)- ( final sg)/(final sg) * 100

Don’t recognise this. Looks like a bit missing, I would expect to find a fractional multiplier ie divider, for the rhs equation

Got it from here. http://www.brewstore.co.uk/wp/wp-content/uploads/2014/04/taking-a-hydrometer-reading-and-calculating-the-alcohol-content-1.pdf

[Colin2B]

ABV= (starting sg)- ( final sg)/(final sg) * 100

Don’t recognise this. Looks like a bit missing, I would expect to find a fractional multiplier ie divider, for the rhs equation

Got it from here. http://www.brewstore.co.uk/wp/wp-content/uploads/2014/04/taking-a-hydrometer-reading-and-calculating-the-alcohol-content-1.pdf

You've missed out the fraction multiplier 1.05/0.79