Table comparing the sandpaper grit standard in Europe and the USA

The below table is originally from Wikipedia but with some slight changes. What it shows is two colored sections, a section where the difference is small enough to not matter too much (green) and a section from where differences are huge and must be thought of (red). As can be seen, it is only when using finer grits that the differences need to be considered. But in the fine grits, the difference is huge.