Japan’s gold, as a single cube

The holding

Japan’s gold reserve, in proportion

Japan's central bank holds about 846 tonnes of gold — one of the ten biggest official holders. That is a number most people cannot picture, so picture this instead: gathered into one solid block, every bar of it would form a cube roughly 3.5 m on each side — about one storey tall. Gold is so dense (19.32 grams per cubic centimetre, about two and a half times the density of iron) that Japan's entire reserve, worth approximately $113 billion, would occupy only about 44 cubic meters.

Gold makes up 9.1% of Japan's official reserves — a deliberately small gold share — Japan keeps most of its reserves in dollars, euros and other currencies, holding bullion as a strategic minority. Measured against the world's monetary gold, that block is about 2.3% of all the bullion held by every central bank and treasury on the planet. Japan sits in Asia, the center of gravity for twenty-first-century gold accumulation.

The metal is held at Bank of Japan, Tokyo. In recent years the holding has been held steady — neither bought nor sold in any size — a quiet vote of confidence in gold's role as a permanent reserve asset. Whether a reserve is growing or steady, its physical footprint barely changes: even doubling Japan's gold would only widen the cube by about a quarter — the defining paradox of the metal is that staggering value keeps collapsing into a remarkably small space.

It is worth holding the comparison in mind. The largest reserve on Earth, the United States', is a cube only 7.5 m per side; all the gold ever mined in human history fits inside a cube about 22 m per side — the size of a seven-story building. Japan's share of that 6,000-year inheritance is the block you see above.