Understanding metric mass conversion involves recognizing the base-ten relationships among milligrams, grams, and kilograms: 1 gram equals 1,000 milligrams, and 1 kilogram equals 1,000 grams. Quantities are converted by multiplying when expressing a larger unit in smaller units and dividing when expressing smaller units in larger units, while preserving the same mass; the scope is limited to whole-number and straightforward decimal conversions rather than compound units or more advanced unit systems.
Metric mass units are related by thousands:
When changing to a smaller unit, multiply by .
When changing to a larger unit, divide by .
Example: Convert kilograms to grams.
A kilogram is larger than a gram, so change to the smaller unit by multiplying:
Therefore,
The mass stays the same; only the unit used to describe it changes.
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