Dimensions and metrics

Understand the building blocks of your reports.

Every report in Google Analytics is made up of dimensions and metrics.

Dimensions describe characteristics of your users, their sessions and actions. The dimension City describes a characteristic of sessions and indicates the city, for example, "Paris" or "New York", from which each session originated. The dimension Page describes a characteristic of page view actions and indicates the URL of each page that was viewed.

Metrics are quantitative measurements. The metric Sessions is the total number of sessions. The metric Pages/Session is the average number of pages viewed per session.

The tables in most Google Analytics reports organise dimension values into rows and metrics into columns. For example, this table shows one dimension (City) and two metrics (Sessions and Pages/Session).

Town/City Sessions Pages/Session
Brighton 5,000 3.74
Berlin 4,000 4.55

In most Analytics reports, you can change the dimension and/or add a secondary dimension. For example, adding Browser as a secondary dimension to the above table would result in the following:

Town/City browsers. Sessions Pages/Session
Brighton chrome 3000 3.5
Brighton Firefox 2,000 4.1
Berlin chrome 2,000 5.5
Berlin Safari 1,000 2.5
Berlin Firefox 1,000 4.7

Valid dimension-metric combinations

Not every metric can be combined with every dimension. Each dimension and metric has a scope: users, sessions or actions. In most cases, it only makes sense to combine dimensions and metrics that share the same scope. For example, Sessions is a session-based metric, so it can only be used with session-level dimensions such as Source, or City. It would not be logical to combine Sessions with an action-level (or hit-level) dimension such as Page.

For a list of the valid dimension-metric pairs, use the Dimensions and Metrics Reference on the Developer website.