What is gravity? Gravity is a measurement of beer's density. An original gravity (OG) reading indicates the number of dissolved sugars in the beer that can be converted into alcohol. These sugars come from malted grain and are later consumed by yeast to convert wort into beer.
ADJUST BY ADDING SUGAR Add corn sugar/invert sugar/ to increase the gravity. To calculate the amount needed, take an initial gravity reading, then subtract that from the specific gravity you wish to begin with. The difference will determine approximately how much sugar to add (use table below).