One troy ounce is exactly 31.1034768 grams, one tola is 11.6638038 grams and the Hong Kong tael is about 37.429 grams, so every conversion routes through grams.
A standard XAUUSD lot is 100 troy ounces, which is 3,110.35 grams or roughly 3.11 kilo bars.
Gold is quoted per troy ounce but traded in lots, kilos and grams depending on the venue, and that mismatch is a common sizing error. Convert between troy ounces, grams, kilos, tolas and taels and see the cash value of each at the current gold price and your lot size.
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