A ratti (Sanskrit: raktika) is a traditional Indian unit of measurement for mass. Based on the nominal weight of a ratti seed, it measured approximately 1.8 or 1.75 grains. It has now been standardized as 0.1215 gram.
- 1 tola = 12 masha or 11.664 gram
- 1 tank = 4 mashas or 3.888 gram
- 1 masha = 8 ratti or 0.972 gram
- 1 Ratti (sunari) goldsmith = 121.5 mg
- 1 Pakki Ratti (for astrological gemstones ) = 1.5 x Sunari Ratti = 1.5 x 121.5 mg = 182.25 mg = 0.91 Carat
A Satamana (Śatamāna, literally "hundred measures") was interpreted as hundred rattis, and used as a standard weight of silver coins of ancient India between 600–200 BCE. Being the same weight as a Babylonian shekel it was actively minted in Gandhara in the northwest Indian subcontinent for trade with West Asia.
- Cunningham, Alexander (1891), Coins of Ancient India: From the Earliest Times Down to the Seventh Century A. D., London: B. Quaritch
- Mukherjee, B. N. (2012), "Money and Social Changes in India (up to c. AD 1200)", in Saiyid Zaheer Husain Jafri (ed.), Recording the Progress of Indian History: Symposia Papers of the Indian History Congress, 1992-2010, Primus Books, pp. 411–, ISBN 978-93-80607-28-3
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