Over 60 formulae are available through the SpreadSheetPlugin.
For Example:
$AVERAGE()
$IF()
$REPLACE()
$TIME()
A formula can be placed anywhere in a topic, not just in a TWiki table.
Example:
To space out WikiWords, write:
%CALC{"$PROPERSPACE(TWikiGuest)"}%
to get:
TWiki Guest
-- Contributors: TWiki:Main.PaulineCheung