title_body: What is the best serving size for a beer tasting?
upvoted_answer: There are two angles to consider 
  
  
  what is best for the beer
  what is best for the tasting scenario
  
  
  For the beer, a serving size that is appropriate should:
  
  
  provide sufficient beer to not warm up excessively in the cup or glass in the minute or two tasting is underway. This means serving sizes should be at least 60ml/2 oz. (If the beer is served too cold, leave it in the bottle to warm, so that all samples are poured together and tasted at the same temperature.)
  
  
  For the tasting situation we have to consider:
  
  
  There may be a limited amount of an evaluation beer to share between the number of judges so serving sizes should be restrained. 
  Furthermore, some additional beer should be left over in case a re-evaluation is necessary. This is particularly important with styles where volatiles are a key contributor, since they dissipate quickly, plus the olfactory sense quickly becomes tired, requiring a pause and then a fresh sample.
  
  
  Taking these two into account gives a typical serving size in the order of 3-4oz/75-100ml.
  
  Note that the glass can be larger - particularly a long tall glass is good for capturing the aromatics of a smaller sample.