A fifth of liquor is 750 milliliters, which is three-fourths of a liter. It is the equivalent of 25.36 ounces. That size of liquor bottle contains about 17 standard drinks.
Other standard U.S. bottle sizes include the miniature, the half pint, the pint, the liter, and the half gallon. The miniature is 50 milliliters. The half pint is 200 milliliters, and the pint is 400 milliliters. A liter is 1,000 milliliters, and a half gallon has 1,750 milliliters. A half pint is equal to about 4 1/2 standard drinks, while a pint is equal to about 8 1/2 standard drinks.