Pareto Chart Generator

Enter categories and counts to create a Pareto chart with cumulative percentage line and 80/20 analysis. Download as PNG.

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#CategoryCount

What Is a Pareto Chart?

A Pareto chart combines a bar chart sorted by frequency with a cumulative percentage line. Named after Italian economist Vilfredo Pareto, it was popularized in quality engineering by Joseph Juran, who observed that a small number of causes typically account for the majority of defects — the principle he called the "vital few and trivial many."

The 80/20 Rule in Quality Engineering

The Pareto principle (80/20 rule) states that roughly 80% of effects come from 20% of causes. In practice, this means a handful of defect categories drive most of your scrap, a few machines cause most of your downtime, and a small number of failure modes account for most warranty claims. The Pareto chart makes this pattern visible so teams can direct improvement efforts where they'll have the greatest impact.

How to Read the Chart

Bars represent individual category counts (left Y-axis), sorted from highest to lowest. The cumulative percentage line (right Y-axis) shows how the categories accumulate toward 100%. Where the line crosses 80% identifies the boundary between the vital few and the trivial many. Categories to the left of that crossing point are your priority targets for root cause analysis and corrective action.

Pareto as Part of the Seven Basic Quality Tools

The Pareto chart is one of the Seven Basic Quality Tools defined by Kaoru Ishikawa, alongside histograms, control charts, scatter plots, check sheets, cause-and-effect diagrams, and stratification. It pairs naturally with a problem-solving methodology like A3 — use the Pareto to identify what to fix, then use structured problem-solving to determine how.

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Frequently Asked Questions

What is a Pareto chart?
A Pareto chart is a bar chart where categories are sorted by frequency in descending order, with a cumulative percentage line overlaid. It visualizes the 80/20 rule — typically 80% of problems come from 20% of causes — helping teams focus on the vital few issues that drive the most impact.
What is the 80/20 rule?
The 80/20 rule (Pareto principle) states that roughly 80% of effects come from 20% of causes. In quality, a small number of defect types typically account for the majority of total defects. Focusing improvement efforts on these vital few categories yields the greatest return.
When should I use a Pareto chart?
Use a Pareto chart to prioritize problems or causes. Common applications: defect analysis, customer complaint categorization, downtime cause analysis, cost of quality breakdown, and root cause prioritization. It's one of the Seven Basic Quality Tools.
What are the vital few and trivial many?
The vital few are the small number of categories accounting for ~80% of the total count. The trivial many are the remaining categories that together account for only ~20%. Joseph Juran coined these terms when applying Pareto's principle to quality management.
How do I read a Pareto chart?
Bars show individual counts (left Y-axis), sorted highest to lowest. The line shows cumulative percentage (right Y-axis, 0-100%). Where the line crosses the 80% mark identifies the vital few categories. Focus your improvement efforts on everything to the left of that crossing point.