The term "a finger of whiskey" refers to a measurement that equates to about two ounces, which can be gauged by the width of one’s index finger around the base of a rocks glass. While the standard shot is 1½ ounces, ordering a pour neat or on the rocks typically gives a slightly larger serving of two ounces. This informal measurement likely originated in 19th-century saloons where bar tools were less common, serving as a hospitable request among patrons.
When you order a shot, the size you'll get at any bar that takes measurements and responsible serving seriously is 1½ ounces.
If you hold your index finger around the base of a rocks glass used for sipping whiskey, the width between your finger and the glass roughly equates to the standard amount of whiskey.
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