## Conversion formula

The conversion factor from grams to kilograms is 0.001, which means that 1 gram is equal to 0.001 kilograms:

1 g = 0.001 kg

To convert 21 grams into kilograms we have to multiply 21 by the conversion factor in order to get the mass amount from grams to kilograms. We can also form a simple proportion to calculate the result:

1 g → 0.001 kg

21 g → M(kg)

Solve the above proportion to obtain the mass M in kilograms:

M(kg) = 21 g × 0.001 kg

M(kg) = 0.021 kg

The final result is:

21 g → 0.021 kg

We conclude that 21 grams is equivalent to 0.021 kilograms:

21 grams = 0.021 kilograms

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilogram is equal to 47.619047619048 × 21 grams.

Another way is saying that 21 grams is equal to 1 ÷ 47.619047619048 kilograms.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one grams is approximately zero point zero two one kilograms:

21 g ≅ 0.021 kg

An alternative is also that one kilogram is approximately forty-seven point six one nine times twenty-one grams.

## Conversion table

### grams to kilograms chart

For quick reference purposes, below is the conversion table you can use to convert from grams to kilograms

grams (g) kilograms (kg)
22 grams 0.022 kilograms
23 grams 0.023 kilograms
24 grams 0.024 kilograms
25 grams 0.025 kilograms
26 grams 0.026 kilograms
27 grams 0.027 kilograms
28 grams 0.028 kilograms
29 grams 0.029 kilograms
30 grams 0.03 kilograms
31 grams 0.031 kilograms