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
"If guns don't kill people, why do we give people guns when they go to war? Why not just send the people?" - Ozzy Osbourne
Sent from my iPhone 4s.
Canon T2i | EF-S 18-55mm | EF 28mm 1.8 | EF 50mm 1.8 | EF-S 55-250mm
3 whipped dog straights, Gillette Ball End Tech, 1959 Gillette Fat Boy
Secondary: Strawberry Melomel