The large gold bars stacked in central bank vaults follow a 'Good Delivery' standard of about 400 troy ounces. About how many kilograms does one such bar weigh?
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Answer
About 12 kg
All the gold ever mined would fit in a cube only about 22 metres on each side.
How to estimate it
This is a unit conversion. Precious metals are weighed in troy ounces of about 31 grams, slightly heavier than the 28 gram kitchen ounce. 400 × 31 = 12,400 grams, so about 12.4 kg, as heavy as a full crate of wine in a block smaller than a brick. Real bars vary a little around about 12 kg.
Source: London Bullion Market Association
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