It depends on the font you are using: most are
proportional which means that all characters are not the same width; an "I" is narrower than a "W" for example.
IIII
WWWW
Non-proportional fonts all have characters with the same widths:
IIII
WWWW
So one way to do what you want is to change the font - but that can look ugly.
Instead, consider using a table instead:
W3Schools HTML tables[
^]
[edit]Tablet autocorrect :sigh:[/edit]