Calculating OG/FG with non-fermentable sugars

[Houblon34]

I recently brewed a batch of Milk Stout to which I added 1lb of lactose during the boil. Finished with an OG of 1.068 (BeerSmith estimated 1.054?). After 10 days, it's at 1.032 and still going down, I sure hope. How will I know the final ABV? I found that 1lb of lactose yields approximately 1.042 ppg. What I am not getting?

(Before someone brings it up, my hydrometer is calibrated properly and I do adjust according to temp.)

[Woody]

I find Beersmith is off sometimes. So many different reasons. I've added molasses in the past and my OG was much higher than expected. I would let the beer sit for another week and take a gravity reading. Check again in 3 days and if it's the same your finished and can use an online abv calculator at places like Brewers friend which I find great to give you your abv. It's as easy as entering your OG and FG. Provided you pitched enough yeast you should finish much lower. Here is the link:

http://www.brewersfriend.com/abv-calculator/" onclick="window.open(this.href);return false;

[Houblon34]

When would it be considered "too late" to pitch more yeast? I've pitched one pack of S-04, which in theory should give me a dryer beer (although it IS a sweet stout...!)

[Woody]

Sounds like you under pitched depending on the batch size. I have not waited that long to add more yeast. Maybe one of the others can help you with that.

[Woody]

If you hit 1.068 OG on a 5 gallon batch you were pretty close with one dry pack of S-04 so I'd hold off adding any additional yeast if you haven't already. If it was a 6 gallon batch you may not finish as low as you would like but I would leave it. I use the following yeast pitching calculator and have had good luck with it.

http://www.mrmalty.com/calc/calc.html" onclick="window.open(this.href);return false;

[Houblon34]

5.25 gallons.

I gently rocked my fermenter last night to resuspend the yeast. Haven't seen much activity even after that. I'll deal with it and end up drinking a very sweet, low ABV stout I guess! lol It's only me second all-grain batch, so I wasn't expecting perfect results anyway.

[Woody]

I think you will be good and it might suprise you how good it will be. Leave it for another 5-7 days. Congrats on the second batch. I find the hobby keeps getting more addictive.

[Houblon34]

I think you will be good and it might suprise you how good it will be. Leave it for another 5-7 days. Congrats on the second batch. I find the hobby keeps getting more addictive.

Thanks for the tips!