The *odds* of getting two heads is 1/3: 1 outcome you want, and 3 outcomes you don't want.

A small but important correction: Odds are notated with a colon, not a slash. So the odds of getting two heads are 1:3 (pronounced "one to three").

Yeah, true, fair enough. But the logarithm of it is still –1.1, so mathematically it's the same as the fraction 1/3.

(uhhhh log-odds are the context in which I'm most likely to interact with odds in my day-to-day life, see)