๐ Process Capability
Process Capability Cpk Calculator
Calculate Cp, Cpk, Ppk and Six Sigma level from your process or analytical data. Paste raw values or enter summary statistics directly. All calculations follow ICH Q8 and ISO 3534-2 definitions.
Input Data
Enter all your data points. Minimum 5 values recommended.
Formulas used:
Cp = (USL โ LSL) / (6ฯ) ยท Cpk = min[(USLโฮผ)/3ฯ, (ฮผโLSL)/3ฯ]
Source: ISO 3534-2 / AIAG SPC Reference Manual
Cp = (USL โ LSL) / (6ฯ) ยท Cpk = min[(USLโฮผ)/3ฯ, (ฮผโLSL)/3ฯ]
Source: ISO 3534-2 / AIAG SPC Reference Manual
Results
Enter your data and spec limits to see Cpk results
Regulatory Context (ICH Q8 / Six Sigma):
Cpk < 1.0 = Incapable process (fails spec) ยท Cpk 1.0โ1.33 = Marginally capable ยท Cpk 1.33โ1.67 = Capable (4ฯโ5ฯ) ยท Cpk โฅ 1.67 = Highly capable (5ฯ+)
Reference: ICH Q8(R2) Pharmaceutical Development; ISO 3534-2:2006; AIAG Statistical Process Control (SPC) Manual, 2nd Ed.
Cpk < 1.0 = Incapable process (fails spec) ยท Cpk 1.0โ1.33 = Marginally capable ยท Cpk 1.33โ1.67 = Capable (4ฯโ5ฯ) ยท Cpk โฅ 1.67 = Highly capable (5ฯ+)
Reference: ICH Q8(R2) Pharmaceutical Development; ISO 3534-2:2006; AIAG Statistical Process Control (SPC) Manual, 2nd Ed.