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 640.5 grams into kilograms we have to multiply 640.5 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

640.5 g → M_(kg)

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

M_(kg) = 640.5 g × 0.001 kg

M_(kg) = 0.6405 kg

The final result is:

640.5 g → 0.6405 kg

We conclude that 640.5 grams is equivalent to 0.6405 kilograms:

640.5 grams = 0.6405 kilograms

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilogram is equal to 1.5612802498048 × 640.5 grams.

Another way is saying that 640.5 grams is equal to 1 ÷ 1.5612802498048 kilograms.

Approximate result

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

640.5 g ≅ 0.641 kg

An alternative is also that one kilogram is approximately one point five six one times six hundred forty point five 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