How much does a helicopter weigh?

A helicopter...a real one that is....can weigh as little as 1300 to 1600 pounds for a 2 place piston, like a Robinson R22 ( guessing the weight) to a BK 117 like I fly which grosses out at 3200 Kgs to the huge Russian machines that are up to over 100,000Kgs. The Mil V-12 is the largest I believe. Whatever their weight they are sure to consume huge amounts of fuel whatever they do.