Metrication or metrification is the act or process of converting to the metric system of measurement.[2] All over the world, countries have transitioned from local and traditional units of measurement to the metric system. This process began in France during the 1790s, and is still continuing more than 200 years later, with the modern International System of Units, as the metric system has not been fully adopted in all countries and areas.

American and British car speedometer, showing the speed of the vehicle in miles per hour (or MPH; outer, in white) and kilometres per hour (or km/h; inner, in red); for Canadian[1] vehicles (and some US or Mexican built export vehicles) the scales are reversed (or in km/h only)
Australian car speedometer, showing the speed of the vehicle only in km/h, as in almost all countries

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This article uses material from the Wikipedia article Metrication, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.