Reference tables

Quick answers to the numbers quality engineers look up every week, each with a link to the calculator.

Cpk to PPM, sigma level and yield

Cpk 0.50 Cpk 0.67 Cpk 0.75 Cpk 0.80 Cpk 0.90 Cpk 1.00 Cpk 1.10 Cpk 1.20 Cpk 1.25 Cpk 1.33 Cpk 1.40 Cpk 1.50 Cpk 1.60 Cpk 1.67 Cpk 1.75 Cpk 1.80 Cpk 2.00 Cpk 2.33 Cpk 2.50 Cpk 3.00

Sigma level to DPMO and Cpk

1 sigma 1.5 sigma 2 sigma 2.5 sigma 3 sigma 3.5 sigma 4 sigma 4.5 sigma 5 sigma 5.5 sigma 6 sigma

AQL sampling tables (ISO 2859-1)

AQL 0.065 AQL 0.1 AQL 0.15 AQL 0.25 AQL 0.4 AQL 0.65 AQL 1 AQL 1.5 AQL 2.5 AQL 4 AQL 6.5 AQL 10

Control charts

Control chart constants d2, c4, A2, D3, D4