When converting between English and Metric units we often write 1 kilogram = 2.2 pounds. This is one case in science where we can blindly write down and use something that is not correct, and still probably get the answer we want! Kilograms are units of mass, and pounds are units of force. These two quantities cannot possibly be the same. It is the logical equivalent to writing down a conversion between gallons and hours!
In the Metric system, on Earth, acceleration due to gravity is 9.8 meters/sec2. So (Mass)*(Acceleration due to gravity) has the units Kilograms*meters/sec2. These units of force are known as Newtons.
In English measurement, the mass unit is the slug. And, on Earth, acceleration due to gravity is 32 feet/sec2. The force unit is, of course, the pound.