Process Capability
Cp / Cpk Calculator
Upload a CSV file or paste measurements to calculate Cp, Cpu, Cpl, and Cpk using selectable within-sigma methods.
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Upload CSV or Use Example Data
Subgroup size is fixed at 1 for I-MR/moving-range capability.
Interpretation
Cp/Cpk use a within-process sigma estimate. The selected subgrouping and sigma estimator determine the capability results.
Cp = (USL - LSL) / 6σwithin