Quality and production
Cpk process capability
Calculates the Cpk capability index from specification limits, mean, and standard deviation. Cpk can be negative when the mean is outside tolerance.
Related calculators
Cp process capability
Calculates the Cp capability index from specification limits and process standard deviation.
Simple process sigma level
Calculates an approximate sigma level as spec limit distance divided by standard deviation.
Bilateral limits from nominal tolerance
Finds upper and lower limits for a symmetric bilateral tolerance.
Clearance from hole and shaft
Calculates signed clearance as hole diameter minus shaft diameter.
Coefficient of variation
Calculates coefficient of variation, standard deviation, or mean.
Mean confidence interval
Calculates the margin and lower and upper mean interval limits from a supplied z value.