## 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

pounds (lb) kilograms (kg)
22 pounds 9.979 kilograms
23 pounds 10.433 kilograms
24 pounds 10.886 kilograms
25 pounds 11.34 kilograms
26 pounds 11.793 kilograms
27 pounds 12.247 kilograms
28 pounds 12.701 kilograms
29 pounds 13.154 kilograms
30 pounds 13.608 kilograms
31 pounds 14.061 kilograms