Yes, a gram is a metric measurement.
It is a measurement of mass.
A gram (also spelled gramme) is a metric unit of measurement. There's no need to convert into the metric system, because it is already metric.
It is called a gram
metre, gram, litre, second
A "gran" is a German measurement, it is neither customary or metric. A "gram" is a metric unit.
All of the above except the yard. Yards are an Imperial measurement, not metric.
The standard, or basic, metric (SI) unit for the measurement for mass is the kilogram, kg. Any form of gram can be used, such as gram, g; milligram, mg; nanogram, ng.