Free Online Stacked Area Chart Maker

Show how multiple series contribute to a total over time. Customize and export instantly.

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What Is a Stacked Area Chart?

A stacked area chart layers multiple data series on top of each other. The topmost line represents the total while each colored band shows one series' contribution over time.

This chart type shows how the composition of a total changes over an ordered axis. The visual stacking lets readers see both the overall trend and relative size of each component. Key components include the stacked colored bands, the cumulative top line, axis labels, a legend, and optional gridlines. Place the most important series at the bottom for best readability.

What Data You Need for a Stacked Area Chart

One time/category column (the x-axis) plus one numeric column per series you want to stack, all sharing the same unit so they sum meaningfully. Example: a Month column followed by Organic, Paid, Referral, and Direct columns — each row's four values add up to that month's total sessions.

When to Use a Stacked Area Chart

Use stacked area charts to show how parts contribute to a total that changes over time — revenue by product line, traffic by source, or population by age group, and energy consumption by fuel type over years.

Stacked area charts are used in business intelligence, demographics, and marketing. They work best with 3-6 series; more than 7 makes bands too thin. Choose stacked area over regular area when series sum to a meaningful total. Choose them over stacked bar charts when data is continuous and you want to emphasize flow rather than discrete comparisons. They are also widely used in environmental science to show cumulative emissions or resource consumption over decades.

Where a Stacked Area Chart Works Best

Showing how website traffic by acquisition channel (organic, paid, referral, direct) builds to total monthly sessions and how the mix shifts.
Breaking quarterly revenue into product lines so leadership sees both total growth and which line is gaining or losing share.
Visualizing a country's electricity generation mix (coal, gas, nuclear, wind, solar) over years to track the energy transition.
Tracking cloud spend by service (compute, storage, networking, databases) month over month to see total burn and which service is creeping up.

Stacked Area Chart Example: Grid Energy Mix

A utility analyst is tracking how a regional grid's electricity sources shifted across one year. Total generation stays flat near 100 TWh per quarter, so they stack four sources (all in TWh) to see the changing mix rather than the total.

Sample data: Quarter,Solar,Wind,Hydro,Gas Q1,10,30,25,35 Q2,20,28,24,28 Q3,35,22,23,20 Q4,25,35,26,14

Total generation held steady at 100 TWh every quarter, so the stack lays the shift bare: the gas band was the thickest in Q1 (35 TWh) and the thinnest by Q4 (14 TWh) — more than halved, a 21-point drop from 35% to 14% of the grid. Renewables (solar + wind + hydro) climbed in step, from 65% to 86%, with solar alone more than doubling from 10 to 25 TWh.

How to Create a Stacked Area Chart Online

Step 1: Open ChartLoad and select the Stacked Area chart type from the chart picker on the main page
Step 2: Add multiple datasets by clicking the plus button and giving each series a descriptive name
Step 3: Enter time-based X-axis labels and the corresponding numeric values for each data series
Step 4: Arrange the series order so the most important or largest series appears at the bottom of the stack
Step 5: Customize fill colors, opacity, axis labels, title, legend, and fonts for a polished presentation
Step 6: Click Export and download your stacked area chart as PNG, PDF, SVG, JPEG, or WebP

Stacked Area Chart Best Practices & Tips

Place the most stable series at the bottom so upper layers do not wobble due to lower-layer volatility.
Use distinct but harmonious colors for adjacent layers to ensure each is clearly distinguishable.
Always start the Y-axis at zero — truncating a stacked area chart grossly distorts the part-to-whole story.
Add a total line along the top edge to highlight the cumulative trend above the individual contributions.
Consider a streamgraph if you want a more aesthetic version and precise value reading is not critical.
Hover tooltips on each layer should show both the individual and cumulative values for full transparency.
If one series is extremely volatile, place it on top so the lower layers maintain a stable visual base.
Use small multiples as a companion view to the stacked area chart so audiences can independently verify individual layer trends without the visual interference of other stacked layers.

Common Stacked Area Chart Mistakes to Avoid

Stacking series that don't share a unit (e.g. revenue plus headcount) — the cumulative top line becomes a meaningless sum and the chart lies.
Cramming in 6+ bands so middle layers get squeezed; only the bottom band sits on a flat baseline, the rest visually distort and become impossible to read precisely.
Reaching for a stacked area when you actually want to compare series against each other — readers can't judge a middle band's height, only its area. Use grouped lines instead.
Plotting series with gaps or negative values; missing points break the stack alignment and negatives make bands overlap rather than layer cleanly.

Frequently Asked Questions

Can I normalize to 100%?

For percentage-based stacking, use the Stacked 100% chart type instead.

How many series work well?

3-6 series is optimal. More than 7 can become hard to read.

What order should I stack the layers?

Place the most stable or largest series at the bottom. Layers higher in the stack inherit the wobble of layers below, so volatile series belong on top.

Related Chart Types

Ready-Made Stacked Area Chart Templates

Skip the blank canvas — open a free, editable Stacked Area Chart template, swap in your own data, and export. Browse all templates.

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