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Yeah, sorry guys. :o

I thought that although a table is useful, a formula for working out grit to micron conversions (and back) might also be useful.

To work out grit when you know microns...

OK, OK. I actually found some data from another source that includes some Shapton derived micron measurements. I couldn't find the formula that Shapton used, but as a quick and dirty attempt to...

Based on that chart, and assuming the data it contained was not rounded or approximated too much (maybe a big assumption, and there's some evidence that it has been to some extent), I just quickly...