You can estimate the OG based on the ingredients used. Just enter them into any of the popular recipe calculators/spreadsheets.
Once you have the OG, you can use the numerous, online ABV calculators to figure out the ABV.
Or, just use this equation:
og-fg X 131
Arguing on the internet is like running in the Special Olympics, even if you win you're still retarded.
My internet friends were making fun of my kegdolly and I took it out on Gary. - Ginger