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 40 pounds into kilograms we have to multiply 40 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

40 lb → M_(kg)

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

M_(kg) = 40 lb × 0.45359237 kg

M_(kg) = 18.1436948 kg

The final result is:

40 lb → 18.1436948 kg

We conclude that 40 pounds is equivalent to 18.1436948 kilograms:

40 pounds = 18.1436948 kilograms

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilogram is equal to 0.055115565546219 × 40 pounds.

Another way is saying that 40 pounds is equal to 1 ÷ 0.055115565546219 kilograms.

Approximate result

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

40 lb ≅ 18.144 kg

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