## 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 638 grams into kilograms we have to multiply 638 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

638 g → M(kg)

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

M(kg) = 638 g × 0.001 kg

M(kg) = 0.638 kg

The final result is:

638 g → 0.638 kg

We conclude that 638 grams is equivalent to 0.638 kilograms:

638 grams = 0.638 kilograms

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilogram is equal to 1.5673981191223 × 638 grams.

Another way is saying that 638 grams is equal to 1 ÷ 1.5673981191223 kilograms.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred thirty-eight grams is approximately zero point six three eight kilograms:

638 g ≅ 0.638 kg

An alternative is also that one kilogram is approximately one point five six seven times six hundred thirty-eight 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)
639 grams 0.639 kilograms
640 grams 0.64 kilograms
641 grams 0.641 kilograms
642 grams 0.642 kilograms
643 grams 0.643 kilograms
644 grams 0.644 kilograms
645 grams 0.645 kilograms
646 grams 0.646 kilograms
647 grams 0.647 kilograms
648 grams 0.648 kilograms