Gold conversion tables

The gold weight conversion procedures of the London Bullion Market Association (LBMA) are used for trading on the London bullion market and accepted internationally. 

Metric-imperial conversions 

The LBMA records its basis for converting the weight of gold bars from grams (metric) to ounces troy (imperial), and vice versa, as follows: 

• 1 gram = 0.0321 ounces troy 

• 5 gram = 0.1608 ounces troy

• 10 gram = 0.3215 ounces troy

• 20 gram = 0.6430 ounces troy

• ½ ounce troy = 15.5517 grams

• 1 ounce troy = 31.1034 grams 

• 1 kilogram = 32.1507 ounces troy 

• 1 tonne = 32,150.70 ounces troy 

Source: BI_3_GoldConversionTables_22Feb:BI_3_GoldConversionTables_22Feb (goldbarsworldwide.com)