Definition:Roman Weights and Measures
Definition
The Roman system of weights is a system of mass units originating from the time of the Roman empire.
This system continued to be used throughout Europe, although it evolved in different directions according to use.
Roman Weights
The Roman units of mass are as follows:
Calcus
- $1$ calcus $= \dfrac 1 8$ scrupulus.
Its value in modern units is estimated to be approximately $2.2$ grains, or approximately $0.14$ grams.
Siliqua
Its value in modern units is estimated to be approximately $2.9$ grains, or approximately $0.19$ grams.
Its modern equivalent is the carat.
Scrupulus
Its value in modern units is estimated to be approximately $17.6$ grains, or approximately $0.14$ grams.
Uncia
Its value in modern units is estimated to be approximately $423$ grains or $27.4$ grams.
Libra
- $1$ libra $= 12$ unciae.
Its value in modern units is estimated to be approximately $5 \, 076$ grains or $329$ grams.