**There are 1,000 grams in 1 kilogram.** Grams are the metric system unit of measure for mass. Kilo is the metric system prefix meaning 1,000 of the base unit.

The metric system is the measurement standard used in engineering and most scientific disciplines. The system is based on measurements for:

- Mass — grams
- Length — meters
- Volume — liters
- Temperature — degrees Celsius

Amounts are expressed in fractions or multiples of 10 and identified by adding a standard set of prefixes to the base unit. In measuring mass, some units for fractions of a gram are:

- Nanogram = 1,000,000,000th of a gram
- Microgram = 1,000,000th of a gram
- Milligram = 1,000th of a gram
- Centigram = 100th of a gram
- Decigram = 10th of a gram

Some units for multiples of a gram are:

- Decagram = 10 grams
- Hectogram = 100 grams
- Kilogram = 1,000 grams
- Megagram = 100,000 grams
- Gigagram = 1,000,000,000 grams