@Captain Swordsman, it's not even that it's more when someone says 3" and I need to do maths to work out that it's 76mm
Or that 1/4" is exactly 6 and a bit millimetres

@Codeine, exactly 6 and a bit? Not very exact.
In the end as long as the measurement “inch, cm, pica, etc” is consistent it should be easy to work out without converting it into your preferred measurement.

As long as it’s not the metric system!