What is the highest alcohol content?

Answer 1

The highest alcohol content physically possible is 100% abv (alcohol by volume) although this is not suitable for human consumption. The highest alcohol content for a distilled beverage is around 190 proof or 95% abv for grain spirits such as Everclear or Gem Clear. These highly flammable beverages are most often mixed with non-alcoholic drinks such as fruit juices, or in a large communal punch bowl as in "jungle juice." As most liquor is between 40 and 50% abv, the ingestion of such spirits often causes extreme intoxication.

Answer 2

High gravity generally refers to a high starting sugar content or dissolved solids in a beer prior to fermentation. The more sugars, the higher the specific gravity reading on a hydrometer, thus "high gravity". To know the alcohol content of a specific beer requires knowing the original gravity (OG) prior to fermentation and the final gravity (FG) after fermentation is complete. A high gravity beer could have a high alcohol content but you need to know starting and final gravity to actually determine alcohol content.