How can I convert monthly active users (MAU) to daily active users (DAU)?

Let's assume you have currently 1'000 MAU.

You have to determine how many times a MAU logs into your application per month. If you have an application that is used by businesses, you could assume ca. 22 logins, since users login every workday in a month.

Since we take the sum of DAU over a given month, multiply your MAU times the logins per months to estimate your usage per month: 1'000 MAU x 22 logins per month = 22'000 DAU.

When you have many different users sign-in to your application during the month, your number might come out lower than that estimate, as a MAU measure will factor each individual user.