SC QUALITY GUILDQuality calculators
Free, no account, and the calculation runs in your browser — nothing you type is sent anywhere.
Also in Resources: 72 tools and templates for improvement projects, audits, inspection and quality management, and two 8D simulations.
Control Chart Builder
Free X-bar and R or I-MR chart builder with run rules applied. Enter your subgroups and see limits calculated from the process rather than from the specification.
Cp and Cpk Calculator
Free process capability calculator. Enter specification limits and process data, get Cp, Cpk, Pp and Ppk, and the difference between what a process could do and what it does.
Gage R&R Calculator
Free gage repeatability and reproducibility calculator. Enter appraiser and part measurements, get %GRR and the number of distinct categories, with what each result actually means.
Sampling plan and OC curve
Free operating characteristic curve calculator. Enter n and c, see producer's and consumer's risk against your AQL and RQL, and what the sampling plan can actually discriminate.
Sigma, DPMO and yield
Free sigma level calculator. Convert between sigma, DPMO and yield, with the 1.5 shift applied the way the examinations apply it, and see why opportunity counting decides the answer.
Rolled throughput yield
Free rolled throughput yield calculator. Roll first pass yield across every step to get true RTY, normalized yield and the size of the hidden factory the final inspection number conceals.
Pareto builder
Free Pareto chart builder. Sorts, cumulates and draws the 80 percent line — then shows whether the vital few is real or an artifact of how you cut the categories.
Control chart constants
Free control chart constants calculator. d2, d3, A2, D3 and D4 derived in your browser from the distribution of the range, for any subgroup size, with what each one is actually for.
Sample size
Free sample size calculator for proportions and means, at your confidence and margin of error, with finite population correction — and when that correction actually changes anything.
Gauge R&R against Cpk
Free calculator showing what measurement error takes out of your capability. Watch gauge R&R widen the observed distribution, cut your Cpk, and start rejecting good parts.
Linearity study
Free gauge linearity calculator. Certified references across the operating range, %EV at each and pooled, and whether the accuracy you proved at the midpoint holds end to end.
Hypothesis test selector
Free hypothesis test selector. Four questions and you have the right test, with the reasoning and the conditions it depends on — plus what running the wrong one actually costs you.
Tools and templates
72 working tools, from the DMAIC roadmap and project charter to audit plans, GD&T position, calibration records and the hoshin X-matrix. Each one runs in your browser; fill it in, print it or save it to a file. See all 72 tools and templates.
Simulations
A one-day supplier audit. You read the pack, choose the processes, interview the people who run them, and defend your findings at the closing meeting.