Weight Conversion

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Which pound should I use?

There are three types of pounds listed in the weight conversion list

pound (avdp): Avoirdupois pounds are in general use in the United States. Unless "troy" or "apoth" is specified, you are most likely dealing with avoirdupois pounds. An avoirduois pound is divided into 16 ounces and is equal to 7000 grains.

pound (troy): Troy pounds (or, more commonly, troy ounces) are used to measure precious metals, such as gold. A troy pound is divided into 12 troy ounces and is equal to 5760 grains.

pound (apoth): Apothecary pounds are the same as troy pounds. The apothecary system has some units that are not part of the troy system (e.g., scruple). That is the only reason for the distinction here.