# Determine a ratio

Sometimes you may want to determine the ratio between two events:

A measure assigns a value to a set, which is interpreted as its size.

A ratio is the relationship between two measures, indicating how many times the first measure contains the second.

This article demonstrates how to construct a query using two measures, then how to determine the ratio between the two measures.

## How to determine the ratio between two measures

This section demonstrates how to create a query that determines a ratio between two measures. In our example, we want to determine the number of unique users who watched movies over the last 200 days, and the ratio of movies watched to the number of unique users.

Determining a ratio between two measures involves three steps:

Define the first measure.

Define the second measure.

Define a third measure that is the ratio of the first two measures.

###### To create a query that determines a ratio between two measures, do the following:

Click

**Explore**.To define the first measure, select the appropriate variables from the dropdown lists. We did the following:

Accept the default

**count**aggregation.Click

**events**and select**user**from the dropdown. The text auto updates to**Count unique user actors**and**filtered to all user actors**.Click measure 1 and enter a unique name for the measure. We entered

**All users**.

Click

**+measure**to begin defining measure 2.For measure 2, select the options from the dropdown lists. We chose to show

**count**unique values of an actor property defined previously,**Number of searches**. We accepted the filter,**Filtered to all user actors**.Click

**measure 2**and enter a name. We named the measure**Searches**.

Click

**+measure**to begin defining measure 3. This measure will be the ratio of the first two measures.In measure 3, click

**Count**, then type an equals sign. Optionally click the arrow to open the Advanced Operations workspace.Type a left bracket [. A dropdown appears containing the first two measures.

Select the numerator from the dropdown list, then type a slash.

Type a left bracket and select the denominator. Click outside the dropdown to accept the expression.

Accept, or change, the

**Split By**,**Starting**and**Ending**values.Click

**GO**to see results.

## More information

See Calculate measures and filters for information about building expressions.

## What's Next

Now that you've created a query to determine a ratio, you can move on to analyzing user sessions with flows.