In this tutorial, I want to show you what the **CALCULATE** function can do through a few examples.

CALCULATEis one of the most frequently used functions in Power BI. It dictates the context being applied to any measure and removes any existing filters in place.

## Using CALCULATE Function For Total Sales

To truly understand the impact that **CALCULATE** has, it’s important to remember that any result within Power BI is computed row per row. It all depends on the context given.

Let’s take a look at this sample data. For this row, the measure gives us a result of 108,466.30 when the **CALCULATE** function was used. This **CALCULATE** column basically shows the numbers from the same date last year through the use of the **SAMEPERIODLASTYEAR** function.

That result is based on the initial context applied, which is the date. For this specific row, the date given is August 14, 2020.

That date is also the initial context for the **Total Sales** measure, which gives us 220,148.60 in that row based on the present time.

But what if within this particular context, I also want to show what we made from a sales perspective but from a different time? This is where CALCULATE becomes even more useful.

## Using The CALCULATE Function With DATEADD

**CALCULATE** is currently allowing me to **compare the Total Sales for the current time period and the sales from last year on the same day**. But this comparison doesn’t necessarily have to be done on an annual basis. We can do day-to-day comparison, and even monthly and quarterly calculations as well.

Before we do that, let’s take a look at the original measure.

Using **CALCULATE**, I referenced the **Total Sales** and used the function **SAMEPERIODLASTYEAR**. This function allows me to jump exactly one year before the current date.

Of course, that sets a restriction on my calculation because it won’t allow me to go beyond the one-year period. So I’ll create a new measure that will let me to do that.

I’m going to start the measure the same way the original measure was made. I’m going to use **CALCULATE** and reference **Total Sales**.

Then, I’m going to use the time intelligence function **DATEADD** and set it to go back for just one quarter.

Once I add that into my table, you’ll see that I now have data that shows the numbers from one quarter ago.

That’s the advantage of using

DATEADDin your measures. It allows you to set any timeframe, as opposed toSAMEPERIODLASTYEAR, which only counts exactly one year prior to the current date.

This time, let me change that measure and set the time back to only one day, instead of one quarter.

As expected, the result I’m getting shows very little difference from the original figure, knowing that only one day has passed.

## Using CALCULATE With The FILTER Function

You can also use **CALCULATE** with the **FILTER** function, which allows us to add even more depth to our analysis.

For this example, let’s see what’s going to happen if we **FILTER** through **ALL** the **Dates**.

Next, I’m going to set it to **MAX** date minus 7, which means one week from the current date.

This gives us a rolling average that looks back at the numbers from a week before, but this time, we’re using **FILTER** to go back instead of **DATEADD**.

Again, it all goes back to the context applied. We’re starting off with the initial context, which looks at the current date, then we’re adding more to that context using the **CALCULATE** function so that we can dictate a new timeframe to look into.

## Conclusion

**CALCULATE** can definitely give you more range to your reports and allows you to make comparisons on your numbers across different timelines. This is something that you can use on elements other than Total Sales, too.

Hopefully you can start applying this function to your own work soon. Feel free to explore other contexts you can add to your measures using **CALCULATE**.

All the best,

Sam

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