What is an Area Chart in Power BI?

Thinking about how to show changes in volume over time? The area chart in Power BI is one of the best tools for the job. It's essentially a line chart with the space between the axis and the line filled in, which helps you visualize the magnitude and trend of your quantitative data. We'll walk through what area charts are, how to make one in Power BI, and some practical tips to make sure your chart is insightful and easy to read.

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What is an Area Chart?

An area chart displays quantitative data graphically by plotting data points on a continuous axis (usually representing time) and connecting them with line segments. The key difference between an area chart and a standard line chart is that the entire area below the line is filled with a solid color or pattern. This visual tweak does more than just look nice - it fundamentally changes what the chart emphasizes.

While a line chart is perfect for showing a trend or the rate of change between data points, an area chart excels at highlighting the volume or magnitude of that change. Seeing the filled-in area gives viewers a tangible sense of the total. For example, a line chart can show you that sales went up, but an area chart shows you the total volume of sales over that period.

The standard components of an area chart are:

• The X-Axis: This almost always represents a continuous variable, like dates, months, or years.
• The Y-Axis: This represents a quantitative measurement, such as sales figures, user counts, or revenue.
• The Area: The colored region below the plotted line, which represents the volume of the measured value.

Types of Area Charts in Power BI

Power BI offers a couple of variations of the area chart. Knowing the difference will help you choose the right one for your specific data story.

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1. Standard Area Chart

The standard area chart is your go-to for visualizing how a single numeric value develops over time. Imagine you want to track total website sessions for the last 12 months. An area chart would clearly illustrate the flow of traffic, making it easy to spot peaks and troughs and get a feel for the overall traffic volume throughout the year.

However, it has one significant limitation: occlusion. When you chart multiple data series, the areas can overlap, hiding the data points for series in the background. If you're comparing two or three distinct series and need to see both the trends and their respective volumes, you can use transparency to mitigate this issue. But for more than a few overlapping series, a line chart is almost always a better choice.

2. Stacked Area Chart

This is where area charts truly shine. A stacked area chart displays the contribution of multiple parts to a whole over time. Rather than overlapping, each data series is stacked on top of the last one. The total height of the chart at any given point represents the cumulative total of all series.

For example, let's say you want to visualize not just total website sessions, but a breakdown by traffic source (e.g., Organic, Direct, Social Media, Referral). A stacked area chart can show you two things at once:

• The change in total traffic over time (the top line of the entire chart).
• How the proportion of each traffic source contributes to that total and changes over the same period.

This makes stacked area charts fantastic for illustrating part-to-whole relationships and understanding shifts in composition. You can instantly see if your growth is coming from organic search or if a paid campaign led to a surge in a particular month.

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When to Use an Area Chart (and When Not To)

Like any visualization, area charts are great for certain tasks but fall short in others. Knowing when to use one is key to effective reporting.

Use an area chart when:

• You want to show the trend and volume of a quantitative value over time.
• You are illustrating a part-to-whole relationship changing over time (use a stacked area chart).
• You need to compare an overall count or volume difference between a few categories.
• The emphasis is on the overall magnitude of change, rather than the precise rate of fluctuation.

Avoid an area chart when:

• You need to compare the trends of multiple data series that intersect frequently. The overlapping fill colors will make the chart chaotic and unreadable. A line chart is a much better option here.
• Your audience needs to see exact values. While area charts show trends well, it's hard to pinpoint precise figures since the focus is on the shaded volume. A bar or column chart offers better clarity for exact values.
• You have too many categories to display in a stacked chart. A chart with ten different colored bands stacked on top of each other will look like a messy rainbow and offer few, if any, useful insights.

How to Create an Area Chart in Power BI

Creating an area chart in Power BI is straightforward. Let's walk through it with a simple example: visualizing monthly sales over a year from different product categories.

Step 1: Get Your Data Ready

Before you even open Power BI, make sure your data is structured properly. For an area chart, you will need, at a minimum:

• A date or time column for your X-axis (e.g., OrderDate).
• A numeric column for your Y-axis (e.g., SalesAmount).
• Optionally, a categorical column for a stacked area chart (e.g., ProductCategory).

Step 2: Add the Area Chart to Your Report Canvas

Once you've loaded your data into Power BI Desktop, navigate to the Visualizations pane on the right-hand side. Find the icon for the Area chart (it looks like a line chart with the area below shaded). Click it, and an empty visual placeholder will appear on your report canvas.

Step 3: Add Your Data to the Chart's Fields

With the new blank chart selected, you'll see several "wells" in the Visualizations pane where you can drag and drop your data fields:

1. From the Fields pane, drag your date field (OrderDate) into the Axis well. Power BI will often automatically create a date hierarchy (Year, Quarter, Month, Day), which lets viewers drill up and down.
2. Drag your numeric field (SalesAmount) into the Values well.

Instantly, you should see a single-series area chart showing your total sales over time.

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Step 4: Create a Stacked Area Chart

To turn this into a more insightful stacked area chart, all you need to do is add a category. Drag your categorical field (ProductCategory) from the Fields pane and drop it into the Legend well.

Voila! Power BI automatically divides the area chart into colored segments, one for each product category, stacked on top of each other. Now you can see not only total sales but also how much each category contributed each month.

Best Practices for Clear and Insightful Area Charts

A poorly designed chart is worse than no chart at all. Follow these tips to ensure your area charts are effective and easy to interpret.

• Start the Y-Axis at Zero: This is non-negotiable for area charts. Because the chart represents volume through the shaded area, starting the axis at a value other than zero will distort the visual perception of that volume and mislead your audience.
• Use Transparency for Overlapping Areas: If you must use a standard area chart to compare a couple of series, head to the 'Format' pane. Under 'Data colors,' you can reduce the fill transparency. This helps viewers see data points that might otherwise be hidden.
• Limit Your Categories: For stacked area charts, less is more. Stick to five categories or fewer. Any more than that and the chart becomes cluttered, making it nearly impossible to distinguish between the different segments or spot trends.
• Order Categories Logically: In a stacked chart, the arrangement of layers matters. A common practice is to place larger, more stable categories at the bottom and smaller, more volatile ones at the top. This creates a smoother baseline and makes changes in the smaller categories more apparent.
• Choose Colors Wisely: Use a color palette that is easy on the eyes and provides enough contrast between different areas. Avoid colors that are too similar, as it can be difficult for viewers to match the legend to the chart segments. Power BI's built-in themes are a good starting point.
• Know When to Use an Alternative: Always ask yourself if an area chart is truly the best visual for your data. If you're trying to compare many series precisely, a line chart is likely better. If you're showing comparisons between discrete categories without a time component, a simple bar chart is usually superior.

Final Thoughts

The area chart is a powerful tool in Power BI for telling stories about volume, trends, and part-to-whole relationships over time. Whether it's tracking sales growth or understanding how different marketing channels contribute to website traffic, mastering this chart type will make your reports more dynamic and insightful. By following a few best practices, you can create visuals that are not only accurate but also easy for your audience to understand at a glance.

While skills in tools like Power BI are incredibly valuable, the process of connecting data sources, building reports, and maintaining them still takes time and expertise. At Graphed, we've made this process nearly instant. You can connect all your key data sources - from Shopify and Google Analytics to Salesforce and Facebook Ads - and use simple, natural language to build real-time dashboards in seconds. Instead of wrestling with data fields and format settings, you can focus on asking questions and getting the insights you need to grow your business.