The equivalent of 148 pounds is 67.13 kilograms. The formula for converting pounds to kilograms is the number of pounds divided by 2.2; 148 pounds divided by 2.2 equals 67.13 kilograms.
The kilogram is a unit of weight in the metric system of measurement that is used throughout most of the world and in the majority of scientific research. The metric system is a base-10 system of measurement that allows ready conversion between different units. For example, one kilogram is equal to 1,000 grams.
The imperial system is used in very few locations, including the United States. Most of the scientific community, even within the United States, uses the metric system.