mass is measured with a balance comparing an unknown mass with an object of known mass. weight is not measeured with the same tools as mass.
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The same units as mass, for objects in the same gravitational reference frame.
Gram is neither a measure of length, nor of weight. It is a unit of mass. Sometimes this is confused with weight, but it isn't the same thing.
The kilogram is the unit of MASS, not of weight. This is often confused. The SI unit of weight is the same as the unit for force, namely the newton.
A pound (lb) is a measure of mass which is not the same as weight. An oject with a mass of 2240 pounds on earth would have a mass of 2240 pounds on the moon. But the weight of the object would be only one sixth on the moon. A mass of 2240 lb is equivalent to an Imperial ton.
Because mass is not the same as weight. Weight is mass times gravity so your weight will change if you are on the earth or moon but your mass will stay the same.