# Pareto Analysis Calculator

> Rank up to ten categories by count with shares and cumulative share.

Page: https://freecalculator.tech/tools/pareto-analysis-calculator
Last reviewed: 2026-09-16

## Formula

Share_i = (Count_i ÷ Σ Count) × 100; Cumulative_i = (Σ_{j≤i} Count_j ÷ Σ Count) × 100, categories sorted from largest to smallest

- Share_i = (Count_i ÷ Σ Count) × 100; Cumulative_i = (Σ_{j≤i} Count_j ÷ Σ Count) × 100, categories sorted from largest to smallest.
- Inputs used: Category 1, Count 1, Category 2, Count 2, Category 3 (optional), Count 3 (optional), Category 4 (optional), Count 4 (optional), and other shown inputs.
- Edge handling: Count 1 is required.; Count 1 cannot be negative.; Count 1 must be no more than 1000000000000.; Count 2 is required.; Count 2 cannot be negative..

## Inputs

- Category 1
- Count 1
- Category 2
- Count 2
- Category 3 (optional)
- Count 3 (optional)
- Category 4 (optional)
- Count 4 (optional)
- Category 5 (optional)
- Count 5 (optional)
- Category 6 (optional)
- Count 6 (optional)
- Category 7 (optional)
- Count 7 (optional)
- Category 8 (optional)
- Count 8 (optional)
- Category 9 (optional)
- Count 9 (optional)
- Category 10 (optional)
- Count 10 (optional)

## Worked example: Five defect categories ranked

Ranked by count, with each category's share and the running cumulative share.
1. Start with Category 1: Surface scratches, Count 1: 120, Category 2: Dimensional out of tolerance, Count 2: 64, Category 3 (optional): Missing fastener, Count 3 (optional): 38.
2. Apply the method: Share_i = (Count_i ÷ Σ Count) × 100; Cumulative_i = (Σ_{j≤i} Count_j ÷ Σ Count) × 100, categories sorted from largest to smallest.
3. Ranked by count, with each category's share and the running cumulative share.

## Common questions

### Where does this formula come from?

ASQ quality resources, Pareto chart: categories are ordered by frequency with a cumulative percentage line. See the source link on this page.

### What kind of calculation is this?

Categories are sorted by count, each share is expressed against the total, and the cumulative share is accumulated down the ranking. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

Ranking by count treats every occurrence as equally important; a rare but severe category will rank low. The result depends entirely on how the categories were defined. Arithmetic over the counts entered — it cannot tell whether the inspection behind them was complete or consistent.

### How do I use the Pareto Analysis Calculator?

Enter the required values for Category 1, Count 1, Category 2, Count 2, Category 3 (optional), and the other fields shown. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Pareto Analysis Calculator use?

Share_i = (Count_i ÷ Σ Count) × 100; Cumulative_i = (Σ_{j≤i} Count_j ÷ Σ Count) × 100, categories sorted from largest to smallest The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the Pareto Analysis Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this pareto analysis calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- American Society for Quality — https://asq.org/quality-resources/process-capability

## Cite this page

- APA: Free Calculator. (2026, September 16). Pareto Analysis Calculator. https://freecalculator.tech/tools/pareto-analysis-calculator
- MLA: "Pareto Analysis Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/pareto-analysis-calculator.
- Link: Pareto Analysis Calculator — Free Calculator, https://freecalculator.tech/tools/pareto-analysis-calculator