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The metal structure of the Eiffel Tower has a mass of 7300 tons, or 7.3 million kilograms. The design of the tower is very space-efficient: if you melted down the pure iron* that it is made of, it would occupy a volume of only 930m3, equivalent to a sphere with a radius of just six metres.
As a visual comparison, one may think of the Washington Monument, which is one-half as tall as the Eiffel Tower , but weighs four times as much! (90,100 k vs. 22,280 k) For the Washington Monument, the above ratio is 1.08, which is significantly less that 4/3.