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Now Questions "what is weight of 1 cubic metre of 20 mm aggregate", their answer will be following: Ans. 1550 Kgs is weight of 1 cubic metre (m3) of 20 mm aggregate. 1 cubic meter 10 mm aggregate weight in kg. The typical weight of 1 cubic meter (1m3) of 10 mm aggregate (stone, gravel) is about 1,620 kg (or 1.62 tonnes).