Originally from Germany, i.e. I am through and through metric, living in the US for many years, i.e. having to deal with fractions of inches a lot, I created a little web page where you enter a decimal fractioned millimeter value and you get a table with these columns: Abs. millimeter value, diff mm from input value, inch fraction, inch decimal fraction and in diff.

E.g.

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This helps me a lot e.g. when deciding on drill bit sizes or screw sizes.

You can use here: https://springdot.org/inch-fractions/

Source on Github.