Thanks for the replies.

Scalerobotics, could you explain with a little code snippet for my better understanding please.

Robert, I want them to be as accurate as practically possible. Of course I understand there is always a slight margin of error but lets see how this one goes. I knew that you can put formulas in Excel and get values but didn't knew that by putting values one can come up with formulas as well, so could you please explain more how to do it.