Weird ABV calculation, need to call in the big guns

[sudbuddy]

So I brewed a Midas Touch clone and there were some mid-fermentation additions that changed the gravity a lot.

O.G. 1.082
F.G. 1.023

THEN I added a quart of unfermented white muscat grape must which raised the gravity to 1.040.

I fermented that and it finished at 1.020

This seems like some tricky mathematics. Any idea how to calculate the ABV on this?

 

[TxBigHops]

So I brewed a Midas Touch clone and there were some mid-fermentation additions that changed the gravity a lot.

O.G. 1.082
F.G. 1.023

THEN I added a quart of unfermented white muscat grape must which raised the gravity to 1.040.

I fermented that and it finished at 1.020

This seems like some tricky mathematics. Any idea how to calculate the ABV on this?

I think you're making it more difficult than it is. Add the .017 to 1.082 and recompute with 1.099 as your OG.

 

[madscientist451]

disregard duplicate post

 

[madscientist451]

I'll take a stab at it with the following assumptions:
OG 1.082
Gravity was reduced by fermentation to 1.023
Gravity was raised by juice addition to 1.040
Gravity reduced by fermentation to 1.020

So the juice addition raised the gravity by .017
OG 1.082 + .017 =1.099
FG =1.020
ABV =11.68%

See now that I'm a little late.........

 

[sudbuddy]

good call. thanks guys