Units Conservion functions
Have standard functions for units conversions like energy, pressure , weight, etc.
They could be someting like [Joule to kilowatt]=J2kW() or [inches to meters] = in2m() or [kW to tep] = kW2tep()
I usually do this with UDFs but its annoying to constantly do this for a new workbook that need them (yes, I know I can make addins, but if I share a file, I also have to share the addin and most people won't know what to do).
They could be in the Engineering section or create a new one like 'Engineering Conversions"