Sizing Concurrent Users & Connections in a Web Environment

Calculating concurrent connections for new web applications isn’t an exact science. Fortunately Sun published a guide with an overview of the sizing process that can be applied to most web applications.

In summary, here are various formulas that you may find useful in helping your customers size their environment:

maximum number of concurrent sessions =
expected percent of users online * user base

average time between page requests =
how often a user requests a page

concurrent users =
number of concurrent sessions / average time between hits

You can read the full document on Sun’s website here.