Conversion formula

The conversion factor from pounds to kilograms is 0.45359237, which means that 1 pound is equal to 0.45359237 kilograms:

1 lb = 0.45359237 kg

To convert 4.2 pounds into kilograms we have to multiply 4.2 by the conversion factor in order to get the mass amount from pounds to kilograms. We can also form a simple proportion to calculate the result:

1 lb → 0.45359237 kg

4.2 lb → M_(kg)

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

M_(kg) = 4.2 lb × 0.45359237 kg

M_(kg) = 1.905087954 kg

The final result is:

4.2 lb → 1.905087954 kg

We conclude that 4.2 pounds is equivalent to 1.905087954 kilograms:

4.2 pounds = 1.905087954 kilograms

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilogram is equal to 0.52491014805923 × 4.2 pounds.

Another way is saying that 4.2 pounds is equal to 1 ÷ 0.52491014805923 kilograms.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that four point two pounds is approximately one point nine zero five kilograms:

4.2 lb ≅ 1.905 kg

An alternative is also that one kilogram is approximately zero point five two five times four point two pounds.

Conversion table

pounds to kilograms chart

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