Jigger

The jigger is the standard measuring tool in professional cocktail making — a double-sided vessel with two different capacities that allows bartenders to measure liquid ingredients precisely before adding them to a shaker or mixing glass. The word jigger has been used in American English as a measurement reference since at least the 1830s and 1840s, and the physical two-sided measuring tool in its current form has been standard bar equipment since the latter nineteenth century. The precise etymology of the word is uncertain; various theories connect it to small machinery and gadgets, to the name for a small measure in colonial American usage, and to other sources. The standard Western jigger features two conical cups joined at their pointed ends. The larger side typically measures 1.5 fluid ounces (44ml), which is the standard American single spirit pour. The smaller side measures either 0.75 oz (22ml) or 1 oz (30ml) depending on the manufacturer. This dual-sided design allows measurement of the primary spirit and smaller quantities of modifiers like vermouth, liqueurs, or syrups without switching tools. Japanese-style jiggers, which entered widespread use in American craft bars during the 2000s and 2010s, have a distinctly different design: tall, straight-sided cylinders rather than hourglass cones, with the larger side engraved with interior measurement lines marking 1 oz, 1.25 oz, 1.5 oz, and 2 oz fill levels. This effectively combines three or four measuring tools into one. The straight walls make it significantly easier to judge exact fill levels compared to a conical jigger where the sloping sides can create visual ambiguity. The Japanese jigger design reflects a broader bartending philosophy centered on precision and consistency — filling to the exact line rather than approximating. For best accuracy with any jigger, fill to the very rim. Surface tension allows a very slight dome of liquid above the rim, which is still an accurate pour if the jigger is leveled.