WebToolArcHow to read this chart
Bubble charts encode X, Y and a third magnitude in circle area.
Before publishing
Use non-negative size values and remember that area—not radius—drives visual emphasis; compare labels and ranges before publishing.
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Bubble Chart Maker
Plot three numeric dimensions at once with bubble area scaled by the third value.
Data readiness & publication review
Reviewing…Check the data before you export
Review the source structure, chart-specific interpretation risks and a copyable accessible summary. The chart itself remains the primary workspace above.
Findings
Accessible chart summary
Reviewing the current data…
This review checks structure and common interpretation risks; it does not prove that the source data, measurement method, denominator, units or conclusion are valid.
Bubble Chart Maker: CSV, Labels & SVG/PNG Export
Create bubble charts from pasted data, import CSV locally, audit numeric rows and ranges, and export chart-ready normalized data plus SVG or PNG.
Use the tool above, then review this deeper calculation.
Core data-to-chart workflows
Start with Graph Maker or CSV Chart Maker, then use a focused chart type when the visual question changes. Keep source data and export evidence connected instead of treating a rendered picture as the only record.
Graph MakerGeneral pasted-data chart workspaceLine Graph MakerOrdered change and multi-series trendsBar Graph MakerCategory comparison and sortingPie Chart MakerParts of one meaningful totalScatter Plot MakerX/Y relationships and trendlineGantt Chart MakerTask schedules across datesRadar Chart MakerMulti-axis profile comparisonCSV Chart MakerCSV/TSV import and chart switching
Bubble-size legend & overlap audit
Read the third variable explicitly instead of relying on visual size alone. The legend uses representative source values and area-proportional circles.
0Valid rows
—Min size
—Median size
—Max size
Use a size legend when the third variable matters to interpretation.
Practical guide and verification
Bubble area should represent the third value
Readers judge bubble area, not radius. A chart that scales radius directly with the data exaggerates large values. Use the size legend and audit to confirm that the visual encoding is area-proportional and interpretable.
Check size range before publishing
If the largest size value is hundreds of times the smallest, tiny bubbles can disappear while large bubbles dominate the plot. Consider transforming, capping, splitting, or using another chart when the size range overwhelms x and y structure.
Labels and overlap compete for space
A useful label can become unreadable when several bubbles overlap. Review crowded regions, reduce unnecessary labels, adjust transparency, or switch to a scatter plot if the third variable is not important enough to justify bubble size.
Include a size legend with axis labels
X and Y axes explain position, but the third encoded variable also needs a clear unit. A size legend with representative values prevents readers from seeing different bubble sizes without knowing what those differences mean.
Audit the source rows before exporting
Verify x, y, and size units, missing values, negative or zero sizes, duplicates, and category meaning before SVG or PNG export. A polished chart cannot repair ambiguous or inconsistent source measurements.