This may be useful to some. There is a website which works out the carbs in any beer if you input in the O.G and the F.G. I had no idea what they were either…
OG/FG- Original Gravity/Final Gravity
When it comes to beer or other alcoholic beverages, gravity (referred to by brewers as specific gravity) has to do with the relative density of the wort at various stages of the fermentation process. OG refers to the specific gravity of the unfermented wort. FG—on the other hand—refers to the specific gravity of the fermented beer. In between OG and FG, some of the sugar in the wort is fermented into alcohol, while the remainder becomes part of the beer’s body (its taste).
Some trivia for you: FG is always lower than OG. Because sugars are converted into both alcohol and carbon dioxide during the fermentation process, the specific gravity reduces. Some sugar is gone, and then alcohol is naturally less dense than water.
I like Brewdog beers, and luckily, they have these details in the “recipe” book which is a free download.