So I've finally kegged up my old ale. I overshot the OG (1.12 instead of 1.095).

After it fermented down to 1.044, I split the batch into two separate carboys and added more wort. The batch I added was a total of 3 gallons (1.5 gallons when to each of the 2.5 of the previous batch) brewed with 4 lbs. DME.

This mix fermented down to about 1.02 (I don't have my notes handy).

So, if I wanted to figure out the final ABV, would I take a weighted average of the two starting gravities and use that to compute with the final final gravity?

If I take a weighted average of the starting gravities, I come out at 1.096, which is right where I wanted to be. Blind luck, since I didn't calculate this before...

Just curious if anyone has thoughts on the right way to calculate this, since everyone asks how strong it is.

FWIW, it's a damn fine beer. One batch has been on tap, the other is aging and I think I might bottle it.