Metrication in India Metrication in India Metrication or metrification is the process of converting to the metric system based on the International System of Units (SI). India's conversion to the metric system occurred in stages between 1955 and 1962. The metric system in weights and measures was adopted by the Indian Parliament in December 1956 with the "Standards of Weights and Measures Act", which took effect beginning 1 October 1958. The "Indian Coinage Act" was passed in 1955 by the Government of India to introduce decimal coinage in the country. The new system of coins became legal tender on April 1957, where the
Caste system in India revenue collection in areas under the Islamic rule. The origin of caste system of modern form, in the Bengal region of India, may be traceable to this period, states Richard Eaton. The medieval era Islamic Sultanates in India utilised social stratification to rule and collect tax revenue from non-Muslims. Eaton states that, "Looking at Bengal's Hindu society as a whole, it seems likely that the caste system – far from being the ancient and unchanging essence of Indian civilisation as supposed by generations of Orientalists – emerged into something resembling its modern form only in the period 1200–1500". Susan Bayly,