The scruple () is a small unit in the apothecaries' system,[1] derived from the old Roman scrupulum (lit.'small pebble') unit[2] (scrupulus/scrupulum).

Mass unit

The scruple is 124 ounce, 13 dram, or 20 grains.[1] It is therefore equal to 1.2959782 grams. The Roman scruple was somewhat smaller, around 1.14 g.

Volume unit

The fluid scruple is 124 fluid ounce, 13 fluid dram, 20 minims, or 14 teaspoon, or 1 saltspoon. It is therefore equal to 1.2323 milliliters in US customary system.

in imperial customary system equal 1,1839 ml .

See also


  1. ^ a b Cardarelli, François (2003). Encyclopaedia of Scientific Units, Weights and Measures. London: Springer. pp. 38, 45. ISBN 978-1-4471-1122-1.
  2. ^ "scruple, n.1", Oxford English Dictionary, 1st ed., Oxford: Oxford University Press, 1911