Figuring out calories in Ale

I bought this stuff, Ichabod's Pumpkin Ale by New Brewery, and I'm trying to figure out how many calories a 12 oz. bottle contains. Does anybody know how I can manually calculate it?

I know that it contains 5.2% alcohol, and then I assume the rest is all carbs. I also know that alcohol is 7 calories per gram, and carbs being 4. Other than that, I have no idea how to figure this out.