evidence: This Calculator Estimates Your Risk of Getting Covid-19 [...] The group decided to measure risk in a unit they named microCOVIDs: a one-in-one-million chance of becoming infected with Covid-19. The website defaults to budget 10,000 microCOVIDs per person per year, which works out to a 1 percent chance of contracting the virus, according to the site. [...] "The way we've posed the pandemic is that any venture outside your home is very risky, and anything inside is fine. And that, of course, is not exactly how life works," says Monica Gandhi, an infectious disease doctor at the University of California, San Francisco, who is not involved in the project. Gandhi uses similar risk calculators in her work to assess patients’ risk of contracting various illnesses and diseases. She appreciates the site’s user-friendly interface and explanations, so people can understand the factors that sway their risk estimates.