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Free Process Capability Calculator (Cp, Cpk, Pp, Ppk)

Compute Cp, Cpk, Pp, Ppk, estimated sigma level, and PPM defective from raw measurement data or summary statistics. Visualize your data distribution against spec limits — all in your browser, no account required.

HOW IT WORKS

  1. Choose an input mode — paste raw measurements (comma or newline separated) or enter mean, std dev, and sample size directly.
  2. Enter spec limits — enter USL and/or LSL. Leave one blank for one-sided capability.
  3. Read results instantly — Cp, Cpk, Pp, Ppk, sigma level, and PPM defective update in real time. Cpk is color-coded: green ≥ 1.33, amber 1.0–1.33, red < 1.0.
  4. Export CSV to save the capability summary for your quality records or control plan.
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Process Capability Calculator
Compute Cp, Cpk, Pp, Ppk, sigma level, and PPM defective from raw measurement data or summary statistics.
Paste Data
Spec Limits
USL (optional)
LSL (optional)
Leave USL or LSL blank for one-sided capability. At least one limit is required.

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