# Rolling Averages In Power BI

Getting a rolling average should be an native function in Power BI. However maybe at the time you read this, there will already be a a feature added. However, in the meantime lets dive into dynamic rolling average using Power BI.

**Here are the list of functions will be using the to create our calculation:**

- SUM
- CALCULATE
- LASTDATE
- DATESINPERIOD
- DISTINCTCOUNT

**There are two points to this formula: **

- Calculating the sum of the value in the period
- Calculating the count of days in the period
- Dividing these two calculations

**Calculating the Sum during the period**

CALCULATE(SUM(VALUE), DATESINPERIOD(DATE,START DATE, NUMBER OF INTERVALS, INTERVAL)

**Calculating the count of day in the period**

CALCULATE(DISTINCTCOUNT(DATE), DATESINPERIOD(DATE,START DATE, NUMBER OF INTERVALS, INTERVAL)

**Formula for a 28 day average**

To make this much cleaner you can use variables that will allow achieve the same affect.

**Dynamic Power BI Rolling Average with DAX Parameters**