http://www.houseofmyrrh.org/engr.htm Alright let me fess up and admit that this is my own creation... And, it's free. It's also a fairly stable beta. Tonight, I am going to upload v1.00... OK What is it? Originally it started as a way to format an Excel cell in Engineering Notation. That is in even powers of 3. Kilo, Mega, milli, etc. It does that pretty good. Using Double Precision numbers. Then I discovered that Excel doesn't handle conversions to and from HEX, Octal, and Binary if the number is greater than 2^31... So, I added some routines to do that. Again, using double precision numbers. Lastly, I added a shift right and shift left function... I could really use some comments and beta testers to help find any remaining bugs. Also, I had stopped issuing a stand-alone workbook containing the macros/functions in favor of the add-in. But, it's been a real pain importing the 'Check Worksheet' because of the way Excel creates absolute links to the add-in functions... Arrrggggghhhhhh! So, (hopefully) sometime tonight (can't FTP from work) I will have both version available.