The Rule Of Thirds As It Applies To Users

User accounts!

A good rule of thumb is the rule of thirds.

A third of your registered user accounts (that aren’t free) will be paid up. A third of your paid up accounts will be logged in at peak times. A third of your users will never log in for any one third of a time period you measure.

You can crunch actual data and come up with concrete results for your specific service, but when you are capacity planning without access to data or the data is too fuzzy, the rule of thirds is a great place to start.

The rule of thirds works on anything where you have paid accounts.