## 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 640 grams into kilograms we have to multiply 640 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

640 g → M(kg)

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

M(kg) = 640 g × 0.001 kg

M(kg) = 0.64 kg

The final result is:

640 g → 0.64 kg

We conclude that 640 grams is equivalent to 0.64 kilograms:

640 grams = 0.64 kilograms

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilogram is equal to 1.5625 × 640 grams.

Another way is saying that 640 grams is equal to 1 ÷ 1.5625 kilograms.

## Approximate result

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

640 g ≅ 0.64 kg

An alternative is also that one kilogram is approximately one point five six three times six hundred forty 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)
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
649 grams 0.649 kilograms
650 grams 0.65 kilograms