Pareto Analysis
Rank non-negative category counts and inspect cumulative contribution.
Pareto Analysis
Browser-only calculations · No input data saved
Worked example results
- Total count
- 100
| Category | Count | Share (%) | Cumulative (%) |
|---|---|---|---|
| Late | 50 | 50 | 50 |
| Damaged | 30 | 30 | 80 |
| Wrong item | 15 | 15 | 95 |
| Other | 5 | 5 | 100 |
Rounded for display only. Export includes the inputs, results, method and assumptions. Refreshing or leaving the tool clears entered data.
How to use Pareto Analysis
- Load the worked example to see the required input format.
- Rank non-negative category counts and inspect cumulative contribution. Use consistent units, periods and definitions.
- Select Calculate, review the assumptions and export the result for your project evidence.
Formula and method
Category share = count / total × 100; cumulative share adds descending category shares.
Interpretation and assumptions
Use mutually exclusive categories for a common period. The 80/20 rule is a heuristic, not a required distribution. Count frequency is not necessarily economic impact.
Results support professional judgement. They are not a certification of process stability, a financial commitment or a substitute for study design.
Frequently asked questions
How do I use the pareto analysis?
Rank non-negative category counts and inspect cumulative contribution. Load the example first, then replace all inputs with consistent process data and select Calculate. Category share = count / total × 100; cumulative share adds descending category shares.
What assumptions matter for pareto analysis?
Use mutually exclusive categories for a common period. The 80/20 rule is a heuristic, not a required distribution. Count frequency is not necessarily economic impact.
Are my calculator inputs saved or sent to a server?
These native calculations run in this browser tab. Inputs are not sent to a server or saved by this calculator. Download the result if you need a record; leaving or refreshing clears the form.