Table 1: Gold Weights and Measures Weight Quantity Conversion Notes Grain 1 0.0648 grams Troy ounce 1 480 grains Troy ounce 1 31.19 grams Troy ounce 32.15 1 kilo Troy ounce 100 3.11 kilos COMEX contract. Troy ounce 32189 1 tonne (metric) ...