20 grains (gr. granuni)

= 1 scruple (scrupulum).

60 grains, or 3 scruples

= 1 drachm 3 (drachma).

480 grains, or 8 drachms

= 1 ounce(uncia).

5,760 grains, or 12 ounces

= 1 pound Ib (libra).