Yellow Belt10 calculators
Yellow Belt calculator map
Find the right calculator for each DMAIC stage, from project definition through control.
Define 2 · Measure 5 · Analyse 1 · Improve 2
✨ NEW · AI TOOL FINDER
What problem are you trying to solve?
Tell us what’s going on — e.g. "I want to know if my process is stable" — and we’ll point you straight to the exact free templates and calculators that help, plus the course that covers them in depth.
Calculators
Lean Six Sigma Tools
25+ free Lean Six Sigma calculators, built for practical improvement work. Measure process capability, Sigma level, cycle time, takt time, OEE, sample size and more. Each tool includes worked examples and interpretation guidance so you understand what the result means, not only the number. No installation, annual licence or sign-up is required: open a calculator in any browser.
Plus free PDF results - download or print your results from any calculator.
Choose with confidence
Which calculator should you use?
- Measuring performance against specification limits: use the Process Capability calculator (Cp and Cpk)
- Understanding variation over time: use a Control Chart or Run Chart tool
- Measuring output against customer demand: use the Takt Time calculator
- Assessing equipment effectiveness: use the OEE calculator
- Planning how much data to collect: use the Sample Size calculator
- Converting defects per million to Sigma level: use the Sigma Level calculator
- Calculating cycle time and throughput: use the Cycle Time calculator
New to process capability?
Our short guide explains Cp, Cpk, what a good score looks like and how to calculate it — before you use the calculator.
Read the guide →Inside the Academy courses
Master the math behind the tools.
Multiple calculators from this page are scattered throughout the Academy courses — paired with full theory, worked examples, and guided projects. Visitors use the tools. Practitioners understand why they work.
- ✓ Calculators embedded across Yellow, Green & Black Belt courses
- ✓ Each one taught in context — with theory and a real project
- ✓ Use the tool here. Master it inside the course.
Green Belt22 calculators
Green Belt calculator map
Find the right calculator for each DMAIC stage, from project definition through control.
Define 3 · Measure 11 · Analyse 4 · Improve 3 · Control 1
Black Belt33 calculators
Black Belt calculator map
Find the right calculator for each DMAIC stage, from project definition through control.
Define 3 · Measure 16 · Analyse 9 · Improve 4 · Control 1
Yellow Belt
Yellow Belt calculators by DMAIC stage
Choose a calculator to open it, or download the printable Calculator Reference Toolkit PDF.
Measure
Analyse
Green Belt
Green Belt calculators by DMAIC stage
Choose a calculator to open it, or download the printable Calculator Reference Toolkit PDF.
Measure
Analyse
Improve
Control
Black Belt
Black Belt calculators by DMAIC stage
Choose a calculator to open it, or download the printable Calculator Reference Toolkit PDF.
Measure
- Standard Deviation Calculator
- Sample Size Calculator
- Cycle Time Calculator
- Lead Time Calculator
- Takt Time Calculator
- Control Limits Calculator
- Cp / Cpk Calculator
- Pp / Ppk Calculator
- Rolled Throughput Yield Calculator
- Confidence Interval Calculator
- Box Plot Calculator
- Gage R&R Calculator
- Gage Linearity & Bias Calculator
- Histogram Calculator
- Attribute Control Charts
- EWMA & CUSUM Chart Calculator
Analyse
Improve
Control
Quality & Six Sigma 01
DPMO Calculator
Calculate Defects Per Million Opportunities to measure and benchmark your process quality against Six Sigma performance standards.
Was this useful?
Quality & Six Sigma 02
Sigma Level Calculator
Convert your defect rate or process yield into a Sigma Level to understand where your process sits on the Six Sigma performance scale.
Was this useful?
Quality & Six Sigma 03
Control Limits Calculator
Paste your process data and instantly calculate UCL, CL and LCL for I-MR or X̄-R charts.
Was this useful?
Quality & Six Sigma 04
Attribute Sample Size Calculator
Calculate the sample size for pass/fail data using zero-acceptance sampling, proportion estimation, or observed-defects confidence interval analysis.
Was this useful?
Quality & Six Sigma 05
Pareto Chart Calculator
Paste your defect or cost data, rank categories from largest to smallest, and instantly visualise the Pareto principle.
Was this useful?
Quality & Six Sigma 06
Rolled Throughput Yield Calculator
Calculate the cumulative first-pass yield across multiple process steps to find your true end-to-end quality rate.
Was this useful?
Quality & Six Sigma 07
Cost of Poor Quality Calculator
Quantify the total financial impact of defects, rework, scrap, and warranty costs across your operation.
Was this useful?
Quality & Six Sigma 08
Cp / Cpk Calculator
Measure process capability and centring using Cp and Cpk indices to assess whether your process meets specification limits.
Was this useful?
Quality & Six Sigma 09
Pp / Ppk Calculator
Measure long-term process performance using overall standard deviation to assess whether your process meets specification limits.
Was this useful?
Statistics 01
Box Plot Calculator
Paste your data to instantly visualise the five-number summary, IQR, whiskers, and outliers.
Was this useful?
Statistics 02
Standard Deviation Calculator
Calculate mean, variance, and standard deviation for a dataset with step-by-step workings shown.
Was this useful?
Statistics 03
Sample Size Calculator
Determine the minimum sample size needed for continuous or attribute data given your confidence level and margin of error.
Was this useful?
Statistics 04
Binomial Probability Calculator
Calculate the probability of exactly k successes in n trials given a fixed probability p.
Was this useful?
Statistics 05
P-Value Calculator
Perform a one-sample or two-sample t-test and get the p-value, t-statistic, and decision at your chosen significance level.
Was this useful?
Statistics 06
Dataset Analysis
Upload a CSV or Excel file, select a numeric column, and get a full Minitab-style analysis with descriptive statistics, normality test, histogram, and box plot.
Was this useful?
Statistics 07
Confidence Interval Calculator
Calculate the confidence interval for a population mean or proportion given sample data.
Was this useful?
Statistics 08
Correlation Calculator
Paste two columns of data to calculate Pearson r, R², and the regression equation with a live scatter plot.
Was this useful?
Statistics 09
Z-Score Calculator
Convert a raw score to a Z-score and find the corresponding probability or percentile.
Was this useful?
Lean & Manufacturing 01
OEE Calculator
Calculate Overall Equipment Effectiveness by breaking performance down into Availability, Performance and Quality.
Was this useful?
Lean & Planning 01
Takt Time Calculator
Find the pace at which your process must produce one unit to exactly match customer demand.
Was this useful?
Lean & Planning 02
Cycle Time Calculator
Calculate average cycle time from total production time and units produced.
Was this useful?
Lean & Planning 03
Lead Time Calculator
Break down total lead time into processing, waiting, and transport components to identify where delays are hiding.
Was this useful?
Lean & Planning 04
Process Cycle Efficiency Calculator
Calculate the ratio of value-added time to total lead time to understand how lean your process really is.
Was this useful?
Lean & Planning 06
SMED Changeover ROI Calculator
Quantify the financial and capacity gains from reducing changeover time.
Was this useful?
Lean & Planning 07
Production Capacity Calculator
Translate available time, cycle time and OEE into a realistic capacity figure.
Was this useful?
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 01
One-Way ANOVA Calculator
Test whether the means of three or more groups are statistically equal. Essential for comparing process settings, materials, or operators.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 02
Attribute Control Charts
Build p-charts, np-charts, c-charts and u-charts for defective or defect count data where individual measurements aren't taken.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 03
Chi-Square Test Calculator
Test for independence between categorical variables or goodness-of-fit. Perfect for analysing survey data and defect classification tables.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 04
Cross Tabulation Calculator
Analyse relationships between two categorical variables with frequency tables, percentages, and chi-square significance testing.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 05
EWMA & CUSUM Chart Calculator
Detect small, sustained process shifts using Exponentially Weighted Moving Average and Cumulative Sum control charts.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 06
Fishbone Diagram Maker
Build Ishikawa cause-and-effect diagrams interactively. Map the 6Ms to identify and visualise root causes of process problems.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 07
Fractional Factorial Calculator
Design and analyse fractional factorial experiments to screen many factors efficiently with fewer runs than a full factorial.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 08
F-Test Calculator
Compare the variances of two populations to determine whether process variation has significantly changed between two conditions.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 09
Gage Linearity & Bias Calculator
Assess whether your measurement system produces consistent bias across the full operating range — a key MSA requirement.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 10
Gage R&R Calculator
Quantify repeatability and reproducibility in your measurement system. Determine whether variation is from the process or the gauge.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 11
Histogram Calculator
Build histograms from raw data with automatic bin sizing, normal distribution overlay, and key descriptive statistics.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 12
Multivariate Analysis (PCA)
Reduce complex multi-variable datasets using Principal Component Analysis. Identify the key factors driving variation in your process.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 13
Multivariate & Rare-Event SPC
Monitor multiple correlated quality characteristics simultaneously with T² charts and track rare events with g- and t-charts.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 14
Nonparametric Tests Calculator
Run Mann-Whitney, Kruskal-Wallis, Wilcoxon and other distribution-free tests when your data doesn't meet normality assumptions.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 15
Normality Test Calculator
Test whether your data follows a normal distribution using Anderson-Darling and Shapiro-Wilk before further statistical analysis.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 16
1 Proportion Test Calculator
Test whether an observed proportion significantly differs from a target value. Ideal for pass/fail and defect rate comparisons.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 17
Paired t-Test Calculator
Compare before-and-after measurements on the same subjects to determine if a process change produced a significant difference.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 18
Poisson Probability Calculator
Calculate the probability of a given number of rare events occurring in a fixed interval — used for defect counts and arrival rates.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 19
Linear Regression Calculator
Model the relationship between a continuous input and output. Predict process outcomes and quantify factor significance.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 20
Response Surface Calculator
Optimise process settings using central composite or Box-Behnken designs. Find the optimal combination of multiple input variables.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 21
Run Chart Calculator
Plot process data over time and apply run chart rules to detect non-random patterns, trends, and shifts without control limits.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 22
Time Series Forecasting Calculator
Forecast future process performance using moving average, exponential smoothing, and trend decomposition methods.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 23
Tolerance Interval Calculator
Calculate statistical tolerance intervals to predict the range that will contain a specified proportion of future process output.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 24
2 Proportions Test Calculator
Compare defect rates or pass/fail proportions between two process conditions, machines, or time periods with statistical rigour.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
🔒 Part of the Advanced PackAll 25 tools · £4.99
Advanced 25
Weibull Analysis Calculator
Model product failure rates and predict reliability over time using Weibull distribution fitting. Essential for warranty analysis.
🔒 Unlock Access
Open Calculator →Already purchased? Click above
No calculators foundTry a different search term or clear the filter.
More coming
More tools on the way
The SimplicityHub calculator library is growing. Got a specific tool or calculation you need? Let us know and we will add it to the roadmap.
Lean Six Sigma by Industry
Industry Guide
Lean Six Sigma in Manufacturing
See how these tools apply on the shop floor — OEE, SMED, VSM and more. Practical examples from real manufacturing environments.
Explore manufacturingAI + Lean
Continuous Improvement with AI
Discover how AI is accelerating process improvement. From root cause analysis to automated reporting — the future of CI is already here.
Explore CI with AINot sure which tool fits your project? Our blog walks through real use cases for each one.
Stay Sharp
Want some insight?
Improvement tips straight to your inbox every week.
See all Lean Six Sigma calculators, browse our project templates, or get certified with our recognised courses.
Why your review matters
Free courses take time and money to create. Your review gives us credibility, brings in more learners, and we plough that revenue straight back into free resources.
Published playbooks
Two published books from SimplicityHub®
Practical, hands-on guides used by our learners — our Ultimate DMAIC and Ultimate Lean playbooks.
25 free calculators.No sign-up. No downloads. Advanced statistical tool pack available for £4.99. View courses →