The weight conversions are to 10 decimal places and are given in all common units of weight measurement.
Countries using pounds and ounces:
The US, UK, ROI, SA, India, Canada, Australia and the remaining Commonwealth of Nations.
The Japanese 1 yen coin has a mass of one gram. (lighter than the British penny (3.56 g), the United States cent (2.5 g) or the "Euro-cent" (2.30 g)).
Wikipedia links covering units of mass show/hide