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
rupee consists of 100 paise. For the next five years, both the old and new systems were legal. In April 1962, all other systems were banned. This process of metrication is called "big-bang" route, which is to simultaneously outlaw the use of pre-metric measurement, metricise, reissue all government publications and laws, and change education systems to metric.