1 megagram is a ton, which is widely used. A lot of stuff is measured in tons, including cars (“this car weighs almost two tons, which is pretty heavy for a spo

1 megagram is a ton, which is widely used. A lot of stuff is measured in tons, including cars (“this car weighs almost two tons, which is pretty heavy for a sports car”), cargo (20-ton train car), etc. It stops on the ton, though - “40 thousand tons of grain” - gigagram isn’t used.