A Jigger, or Measure, is a bartending tool resembling an hourglass, which measures 1.5 fluid ounces on the large half and 1.0 fluid ounces (pony shot) on the small half. Other jigger measurements exist, including 2.0 fluid ounces on the large half and 1.0 fluid ounces on the small half.

In Britain, a “jigger” is defined as 50ml (1.60 oz.) on the large half and 25ml (0.84 oz.) on the small half.