7 g | 6 kg | 2 kg | 8 g |

= ? kg | = ? kg | = ? kg | = ? kg |

When comparing weight using metric units, there are 3 common units to compare: milligrams (mg), grams (g), and kilograms (kg).

- 1 kilogram (kg) = 1,000 grams (g)
- 1 gram (g) = 1,000 milligrams (mg)