How many grams are in 1 kilogram?

In the metric system, the kilogram is the base unit of mass. One kilogram is defined as being equal to 1,000 grams. This relationship is critical for conversions within the metric system, where each unit scales by factors of ten. Therefore, when converting from kilograms to grams, you multiply the number of kilograms by 1,000 to obtain the mass in grams. Since one kilogram is exactly equal to 1,000 grams, this option aligns perfectly with the foundational measurements of the metric system.

This understanding is fundamental for many practical applications in science, nutrition, and everyday weight measurements where precise conversions between these two units are often necessary.