A peg is an informal unit of measurement of alcoholic spirits; it is similar to a jigger. Peg measures for use in preparing alcoholic drinks can hold anywhere from 1 to 2 fluid ounces (30-60 ml). In some jurisdictions the "peg" is a standardized measure. 1units=30ml whiskey =100 ml wine= 250 ml beer
Since IMFL contains 42.8 % alcohol by volume, 30 ml liquor contains 12.84 ml or 10.13 grams pure alcohol (@ 0.789 g/ml) .
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A peg is informally considered as an amount of alcoholic drink that is taken at a single shot.
large peg (also full peg) is equal to 60 millilitres and small peg (also called half-peg) is equal to 30 millilitres.