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JamesBugman I went to HomeDepot here in Canada last week and everything is Imperial.
That is unequivocally NOT true of your experience in Canada.
The import regulations for Canada state that everything imported for sale in Canada from a foreign country like the USA, must be displayed in metric measure and this includes everything sold at any Home Depot in Canada.
What Home Depot will do is post Imperial measure for tools and screws etc, but will also post metric measure for screws, nuts and tool sizes in the same immediate area of the store shelf where one can choose either metric or 'standard Imperial measure'.
The truth is, there is no metric equivalent for 1/4", 1/2", etc because the old Imperial 'standard' measure is an entirely different 'size' when it comes to tools in a tool box or nuts that screw onto a bolt.
For Home Depot to do as you otherwise have stated would shut down Home Depot in Canada overnight.