This question is a bit tricky because "metric" isn't a standard unit of measurement. It's a system of measurement (the metric system).

To answer your question, we need to know what metric unit you're referring to. Here are some examples:

* 1 kilogram (kg) = 1000 grams (g)

* 1 gram (g) = 1 gram (g)

* 1 milligram (mg) = 0.001 grams (g)

Please clarify what metric unit you're asking about so I can give you the correct conversion.