Using inches or cm / mm from the metric system for Americans and Canadians?

Question

We are developing an international product that displays the line of the user. Currently, in Germany and many other countries, of course, the metric system is common to use: cm or mm.

I know that Americans and Canadians (and possibly others too) still use inches, feet and yards.

So the question is, will today's Americans (and other citizens of inch countries) understand the metric system and take it for granted - or do they still love their inches so much that they are more likely to die than use the product with the wrong measurements? (sorry for the dumb;))

Answer 1

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Answer 2

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Answer 3

In Canada, we do not use inches or yards at all. We sometimes use legs, but only because one leg is almost exactly 30 cm (one ruler).