How big is your chance of dying in an ordinary day?

A Micromort can also be compared to a form of imaginary Russian roulette in which 20 coins are thrown in the air: if they all come down heads, the subject is executed.  That is about the same odds as the 1-in-a-million chance that we describe as the average everyday dose of acute fatal risk.

That is from Michael Blastland and David Spiegelhalter, The Norm Chronicles: Stories and Numbers About Danger, which is an interesting book about the proper framing and communication of risk.