Mass is a property of a physical body that measures its resistance to acceleration (a change in its state of motion) when a net force is applied. The basic SI unit of mass is the kilogram (kg). Mass is not the same as weight. Weight meausures the a force exerted on an object by gravity, while mass is the amount of matter of that object. This Mass converter allows you to convert Atomic mass unit (u), attogram (ag), carat (car, ct), centigram (cg), dalton, decigram (dg), dekagram (dag), Earth's mass, Electron mass (rest), exagram (Eg), femtogram (fg), gamma, gigagram (Gg), grain (gr), gram (g), hectogram (hg), hundredweight (UK), hundredweight (US), kilogram (kg), kilogram-force-sq. second/meter (kgf·s2/m), kilopound (kip), kiloton (metric) (kt), kip among other units related to Mass.