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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.
1 The Eiffel Tower is 1,063 feet (324 meters) tall, including the antenna at the top. Without the antenna, it is 984 feet (300 m).  It was the tallest manmade structure until the Chrysler Building was built in New York in 1930.