We cant exactly weigh the earth but scientist have been able to estimate the weight of the earths parts like the crust, mantle and core. The estimated weight is 6.6 sextillion tons or 6,600,000,000,000,000,000,000 tons. The earth gains 100,000 ponds ever year due to meteoric material and dust falling on the earth as well as burning fuel residue and ocean spray salt.