Is unit conversion easier with the metric system?
the conversions between the same type of unit mg to kg is a function of base ten. It is easy because conversion between units of mass is just moving the decimal point.
The conversion between different types of units makes sense.
The conversion of volume to mass has a connecting standard as well. 1 ml of pure water at STP equals 1 gram.
The metric system is much easier to work with than the haphazard English system