40 pounds is equal to about 18.1 kilograms. To convert 40 pounds to kilograms, you can use the following formula:
$$\text{kg} = \text{lbs} \times 0.45359237$$
Using this formula, we get:
$$\text{40 lbs} \times 0.45359237 = \text{18.1436948 kg}$$
Therefore, 40 pounds is equal to approximately 18.1 kilograms.
