A litra (plural: litrae; Ancient Greek: λίτρα) is a small silver coin (or unit of measurement for other precious metals) used in the colonies of Ancient Greece in general and in ancient Sicily in particular. As a coin, the litra was similar in value to the obol and weighed one-third of a Roman libra, i.e. 109.15 g (3.850 oz). In silver, the coin weighed 0.87 g (0.031 oz) and was equal to one-fifth of a drachma.