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Calculators

Tools built for
practitioners.

A growing library of free, practical calculators for Lean Six Sigma improvement work, built to support real delivery from Define through to Control. Run the numbers in your browser, sanity-check your data, and keep improvement work moving — no spreadsheets, no downloads, no sign-up required.

simplicityhub.co.uk/tools
25 Calculators
Free No sign-up needed
100% In-browser
Always growing

Every calculator runs entirely in your browser — no spreadsheet, no download, no data sent anywhere.

Simulation Lab
Interactive scenarios
on every calculator.
Making things simple.
Enter the Lab →
DPMO Calculator
Defects per million
Sigma Level
Process performance
Control Limits
SPC charts with UCL/LCL
Takt Time
Production rhythm
OEE Calculator
Equipment effectiveness
Box Plot
Distribution & outliers
25 Tools
Free, in-browser
DPMO Calculator
Defects per million
Sigma Level
Process performance
Control Limits
SPC charts with UCL/LCL
Takt Time
Production rhythm
OEE Calculator
Equipment effectiveness
Box Plot
Distribution & outliers
25 Tools
Free, in-browser
Category:
Quality & Six Sigma 01

DPMO Calculator

Calculate Defects Per Million Opportunities to measure and benchmark your process quality against Six Sigma performance standards.

QualitySix Sigma3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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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.

QualitySix Sigma1 input*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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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.

QualitySPCData paste*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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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.

QualityAcceptance Sampling3 modes*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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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.

QualityAnalysisData paste*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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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.

QualitySix Sigma2+ inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Quality & Six Sigma 07

Cost of Poor Quality Calculator

Quantify the total financial impact of defects, rework, scrap, and warranty costs across your operation.

QualityFinance4 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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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.

QualityCapability3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Quality & Six Sigma 09

Pp / Ppk Calculator

Measure long-term process performance using overall standard deviation to assess whether your process meets specification limits.

QualityPerformance3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Statistics 01

Box Plot Calculator

Paste your data to instantly visualise the five-number summary, IQR, whiskers, and outliers.

StatisticsAnalysisData paste*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Statistics 02

Standard Deviation Calculator

Calculate mean, variance, and standard deviation for a dataset with step-by-step workings shown.

Statistics1 input*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Statistics 03

Sample Size Calculator

Determine the minimum sample size needed for continuous or attribute data given your confidence level and margin of error.

StatisticsSampling3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Statistics 04

Binomial Probability Calculator

Calculate the probability of exactly k successes in n trials given a fixed probability p.

StatisticsProbability3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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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.

StatisticsHypothesis Testing3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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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.

StatisticsFile upload*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Statistics 07

Confidence Interval Calculator

Calculate the confidence interval for a population mean or proportion given sample data.

StatisticsEstimation3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Statistics 08

Correlation Calculator

Paste two columns of data to calculate Pearson r, R², and the regression equation with a live scatter plot.

StatisticsRegressionData paste*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Statistics 09

Z-Score Calculator

Convert a raw score to a Z-score and find the corresponding probability or percentile.

Statistics3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Lean & Manufacturing 01

OEE Calculator

Calculate Overall Equipment Effectiveness by breaking performance down into Availability, Performance and Quality.

LeanManufacturing3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Lean & Planning 01

Takt Time Calculator

Find the pace at which your process must produce one unit to exactly match customer demand.

LeanPlanning2 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Lean & Planning 02

Cycle Time Calculator

Calculate average cycle time from total production time and units produced.

LeanPlanning2 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Lean & Planning 03

Lead Time Calculator

Break down total lead time into processing, waiting, and transport components to identify where delays are hiding.

LeanFlow3 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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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.

LeanEfficiency2 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Lean & Planning 06

SMED Changeover ROI Calculator

Quantify the financial and capacity gains from reducing changeover time.

LeanPlanning4 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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Lean & Planning 07

Production Capacity Calculator

Translate available time, cycle time and OEE into a realistic capacity figure.

LeanCapacity4 inputs*
Simulation Lab
Interactive scenario inside.
Real numbers. Real context. Making things simple.
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25 free calculators. No sign-up. No downloads. View courses →