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 21 pounds into kilograms we have to multiply 21 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

21 lb → M_(kg)

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

M_(kg) = 21 lb × 0.45359237 kg

M_(kg) = 9.52543977 kg

The final result is:

21 lb → 9.52543977 kg

We conclude that 21 pounds is equivalent to 9.52543977 kilograms:

21 pounds = 9.52543977 kilograms

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilogram is equal to 0.10498202961185 × 21 pounds.

Another way is saying that 21 pounds is equal to 1 ÷ 0.10498202961185 kilograms.

Approximate result

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

21 lb ≅ 9.525 kg

An alternative is also that one kilogram is approximately zero point one zero five times twenty-one 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