I looked at a maple tree (silver), Circumferance 14' 9" at eye level, so lets say 5' ABH is close enough, that means 19.75 sqf. @ 50 lbs per cubic foot a ten foot stump ought to go close to 1,000 lbs per foot, 5 ton. Is there an easy way to figure out what it weighs? Does 50lbs per cubic foot green sound like it is enough for a maple or is it time to wait for the crane to weigh it? I tell the customer he doesn't want me to drop that or the first twenty feet of that tree next to his house, down his driveway, he needs the crane to lift it out of there. I'm telling him the first 20' of this stump is somewhere between 10 and 12 ton.