Process Capability and Defects

These tools measure how well a process meets its requirements. Cpk compares the spread to the specification limits, Gage R&R separates measurement variation from part variation, the Six Sigma calculator gives DPMO and sigma level, and First Pass Yield counts units good the first time.

Tools in this group

• Cpk Formula and Calculator — Enter the mean, standard deviation and specification limits, or paste your measurements, to get Cp, Cpk, Pp, Ppk and the expected parts out of spec.
• First Pass Yield Calculator — Enter units in, good first time, rework and scrap to get first pass yield, or list your process steps for rolled throughput yield.
• Gage R&R Formula and Calculator — Paste your gage study measurements (part, operator, trials) to get EV, AV, GRR, %GRR of total variation and tolerance, and ndc.
• Six Sigma Calculator (DPMO and Sigma Level) — Enter defects, units and opportunities per unit to get DPMO, yield and the sigma level, or convert a sigma level or ppm.