How many milligrams per kilogram are in 1 milligram per pound?

Answer 1

There are always exactly 1000 milligrams per kilogram. There are always exactly 455.392 millgrams in a pound.

"One milligram per pound" would make the two equivalent, a nonsensical position which they are not by definition.

Answer 2

There are approximately 2.20462 pounds in a kilogram. Therefore, to convert 1 milligram per pound to milligrams per kilogram, you would multiply by 2.20462. So, 1 milligram per pound is equivalent to 2.20462 milligrams per kilogram.