The troy weighting system was originally used in Troyes in France to measure the weight of precious metals such as gold and silver. The troy ounce (t oz / ozt) is today the only measure of the troy weighting system that is still in use.

  • 1 troy ounce (t oz / ozt) = 31.1034768 grams 
  • 1 troy ounce (t oz / ozt) = 0.0311034768 kilograms 
  • 1 troy ounce (t oz / ozt) = 480 grains 
  • 1 grain = 0.06479891 grams

Don’t confuse a troy ounce with a standard (avoirdupois) ounce…

A troy ounce is about 10% heavier than a standard (avoirdupois) ounce. When the silver price is advertised or said to be $30 per fine ounce in the market place, the ounce is in reference to a troy ounce which is equal to 1.09714286 standard (avoirdupois) ounces.

  • one troy ounce (t oz / ozt) = 1.09714286 ounces
  • 0.911458333 troy ounce (t oz / ozt) = one ounce (oz)
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