Pareto Analysis
Sort problem categories by frequency and reveal cumulative percentages, directly in your browser.
Who it is for
Production, service, complaint and improvement teams working with defect counts.
What you get
Ranked counts, category percentages, cumulative percentages, and proportional bars.
How to use it
- 01 · Enter categories and counts
Put one entry per line, separated by a semicolon: Defect category; count.
- 02 · Compare ranked contributors
See the distribution and cumulative share. Repeated category labels are combined.
- 03 · Choose what to investigate
Review severity, cost and risk before prioritising improvement work.
Frequently asked questions
Does 80/20 always hold?
No. The rule of thumb does not guarantee any particular distribution.
Can I use decimal counts?
Yes, you can enter decimal weights as well as whole-number incident counts.
Pareto shows frequency contribution, not severity or root cause. Investigate critical rare defects separately; there is no guarantee that 20% of causes make 80% of losses.
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