So a yard is roughly one meter. It means a kilo-yard is about one kilometer and a centi-yard is one centimeter. How many miles or inches that is, is a conversion problem within the imperial system.
In the same way, a quart is about one liter. Milli-quart is about one milliliters. Easy. How many gills those are is not our problem.
There is no immediate equivalent for weight, although a double-pound would be roughly one kilogram.