title_body: How do I measure the sugar content of brewed beers?
upvoted_answer: Unfortunately, you're not going to easily achieve the solution to your question. Your best bet would be to find the nutritional information for the beer you seek. It isn't readily available, though, legislation has passed requiring craft beer producers to provide this information. While this sounds logical - this can significantly impact smaller craft brewers. :( 
  
  You can't actually tell what the sugar content is of a beer without knowing the Final Gravity of the wort before fermentation giving you the Original Gravity. These difference in OG-FG tell you the Alcohol By Volume of the beer in question. Specific gravity is measured in kg/(m^3) - I'm sure there is some math that could be done to figure out how to convert a known Final Gravity into know sugar amounts.
  
  
  The downside becomes knowing what type of sugars were in the original recipe. Without knowing exactly what went into the beer (and recipes can be quite proprietary) - you'll be hard pressed to figure out exact sugar content.