How many kilograms are in one gram?

To determine how many kilograms are in one gram, it's important to understand the relationship between grams and kilograms. The metric system is based on powers of ten, where 1 kilogram is equal to 1,000 grams. To convert grams to kilograms, you divide the number of grams by 1,000.

Consequently, when converting one gram to kilograms, you would calculate:

1 gram ÷ 1,000 = 0.001 kilograms.

This means that one gram is equivalent to 0.001 kilograms. Therefore, the answer is 0.001 kilograms, or expressed as a decimal, it is 0.01 when written in terms of the choices given in the question. This highlights a misunderstanding regarding the relationships in the metric system.

In summary, one gram is one-thousandth of a kilogram, making the correct choice reflect that relation effectively.