Calculator
A numeric calculator that also understands lap-time input. Type a plain
number and it's treated as seconds; anything containing a : is parsed as a
time (hh:mm:ss.uuu or mm:ss.uuu). Results can be shown as H:M:S or
plain seconds, toggled from the panel's header. Parentheses group
sub-expressions.
The whole running tape - every operand and operator - is kept and restored automatically the next time you open the calculator, even after closing it.
Open it from the Calculator button in the app bar; it always opens in its own window rather than docked into a tab, so it stays out of the way of your timing panels.