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The usual symbol for mass is m and its SI unit is the kilogram. ... The weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.
A unit of mass is a unit in which the amount of matter contained in a substance is measured. The SI unit of mass is Kilogram(kg). Other common units are tonne, pound, quintal, etc...
We know the main standard unit of mass or weight is kilogram which we write in short as 'kg'. 1000th part of this kilogram is gram which is written in short as 'g'.