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Result
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Simplified constant-sample-size limits. If subgroup sizes vary, calculate chart-specific limits for each subgroup rather than applying one constant n.
How to use this calculator
What to enter
Enter or select the following as requested: Chart type; Total defectives or defects; Total units inspected; Sample size for limits. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
Control limits depend on the selected chart type and the counts entered. Confirm that the chart matches your data and investigate points outside the limits before drawing conclusions.
When to use it
Use this to analyze process quality or plan a quality-improvement study. Verify data collection and statistical assumptions before changing a process or reporting formal capability results.