The fluid dram is defined as 18th of a fluid ounce equivalent to 3551 ml but dates back to a time when whisky was a rare luxury hence the tiny volume. According to the definition a dram in the old English system of measurement corresponds exactly to 0003551633032809 l which corresponds to approximately 355 ml rounded. Pin On Licor The fluid dram is defined as 18th of a fluid ounce equivalent to 3551ml but dates back to a time when whisky was a rare luxury hence the tiny volume. . As whiskey isnt sold by weight we need to use the liquid version ie. For example the US Customary System defines a dram as 18 of a fluid ounce of whisky by weight. The fluid dram which is specified to be 18 of a fluid oz. How many ml is a dram of whiskey. A Scottish definition of the dram is closer to what may be practical it is 113 of a pint or approximately 43 ml. Nowadays the term dram would simply be applied to a whisky served in a standard 25