I doubt it, the width of a font may be a standard thing for that font (each one is different), like en and em (the width of a letter n and the width of a letter m).
BUT! the real trick to fonts is that it's all basically an optical illusion.
take the the letters yo and ym if you use certain fonts the y overhangs the o and the doesn't with the m, this is so when reading it, optically it all looks the same and doesn't look odd.
For the same reason, nearly all rounded letters in most fonts eg. o u c s hang above and below the line because there arc would make them seem smaller in camparison to k w n etc.
Basically it's called kerning, and each set of letter pairs has it's own spacing.
So, I don't think so,
sorry for the long winded explaination.
easier with fonts such as courier new, where each character is the same width. Otherwise, the only thing I can think off the top of my head is to use a spare or hidden sheet, and with a macro, paste each line of text into a cell, then set the width of the column to auto fit selection, then check the width of the column. You can record a macro to do all of this except checking the width of the cell, which is just :
If you need more help writing the macro, let me know. Some Excel guru is now going to tell you there is a much better way, but this is all I can think of. At least it gives you some numbers to play with!