Due to my limitations, at this point I cannot create online calculator. To compensate that, I tried to make useful spreadsheet.
But, today I did it! I made my first online calculator, which is instrument air sizing calculator. Please click this link to access to instrument air and air compressor online calculator. I hope you find it useful.
It is better for you to check two of previous post related with the calculator. Calculation basis used in this calculator is based on those two post.
I already replaced spreadsheet attached in this post : Spreadsheet of Air Compressor and Air Dryer Calculation. So you can trace how the calculation works.