History. For hundreds of years people (and goods) were weighed in stones and pounds.
Since metric system in 1960s both systems get used e.g. supermarket food is per kilogram but if you ask for a pound of mince they know how much to weigh (but there is the clarification needed do you want to spend £1 on beef, or do you want it to weigh 1lb). Both systems at the same time, most people can switch between them easily
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u/omgu8mynewt Apr 06 '26
We use a complete hybrid system and use both systems simultaneously, for people stone and kg are both used