Cheers 'TC' & Roger...
I had thought of a simple formula in Excel, but that would require a different worksheet for each 'scale' as I see it and very messy too.
The reproduction factor for Photoshop etc was previously found by: What you want, divided by what you have, multiplied by a 100 or something like that, I have it written down somewhere, so I can find that easily enough if we need that.
Like I said, being gadget mad, like most model boaters, I would have thought that such an application would be very handy in the workshop/desk at home, or at the pondside when considering that new project.
I know the ScaleCalc is royalty free and free to download, but I personally would have no problems with making a donation to the website if it ever became available for a copy of the application. Over to Martin on that one.
It would be great if you could pull this off Cowboy!