SPC Control Chart (X-bar & R)
Real statistical process control: subgroup means and ranges, the standard constants, Cp/Cpk, and all four Western Electric run rules.
SPC Control Chart (X-bar & R) is a free Excel workbook: 4 sheets, 406 live formulas and realistic sample data throughout, 18 KB as .xlsx.
The formulas are printed on this page, unedited, so you can check the method before downloading anything. Swap in your own numbers and the whole file recalculates — which is the part no chat window can hand you. Opens in Excel, Google Sheets, Numbers and LibreOffice; no add-in and no macro.
A look inside
This is a real slice of the Control chart sheet from the actual file — not a screenshot, and not a mock-up. Cells shown in violet are live formulas, exactly as they arrive.
| # | Subgroup | Mean | Range | UCL | LCL | Centre | +2σ |
|---|---|---|---|---|---|---|---|
| 14 | 1 | =Measurements!G2 | =Measurements!H2 | =$B$5 | =$B$6 | =$B$2 | =$B$2+2*$B$7 |
| 15 | 2 | =Measurements!G3 | =Measurements!H3 | =$B$5 | =$B$6 | =$B$2 | =$B$2+2*$B$7 |
| 16 | 3 | =Measurements!G4 | =Measurements!H4 | =$B$5 | =$B$6 | =$B$2 | =$B$2+2*$B$7 |
| 17 | 4 | =Measurements!G5 | =Measurements!H5 | =$B$5 | =$B$6 | =$B$2 | =$B$2+2*$B$7 |
| 18 | 5 | =Measurements!G6 | =Measurements!H6 | =$B$5 | =$B$6 | =$B$2 | =$B$2+2*$B$7 |
| 19 | 6 | =Measurements!G7 | =Measurements!H7 | =$B$5 | =$B$6 | =$B$2 | =$B$2+2*$B$7 |
| 20 | 7 | =Measurements!G8 | =Measurements!H8 | =$B$5 | =$B$6 | =$B$2 | =$B$2+2*$B$7 |
| 21 | 8 | =Measurements!G9 | =Measurements!H9 | =$B$5 | =$B$6 | =$B$2 | =$B$2+2*$B$7 |
What’s in the file
What it explains
- Control limits are NOT specification limits
- The four Western Electric rules
- Read the R chart first
Download it
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Related templates
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<a href="https://www.datahubpro.co.uk/excel-templates/spc-control-chart">SPC Control Chart (X-bar & R)</a> — free Excel template from DataHub Pro
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