Weights and Measures

1 troy ounce = 31.1035 grams

Kg = 32.150747 troy ounces

480 grains = 1 troy ounce

Tonnes = 32,150,7466 troy ounces

Tael = 1.203370 troy ounces

Tola = 0.374878 troy ounce


A troy ounce is used specifically in the weighing and pricing of precious metals and its use dates back to the Roman Empire when currencies were valued in weight. The process was carried over to the British Empire where one pound sterling was worth one troy pound of silver. The U.S. Mint adopted the troy ounce system in 1828.

A troy ounce is about slightly heavier than an imperial ounce by about 10%. An imperial ounce equals 28.35 grams, while a troy ounce is equal to 31.1 grams.

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