The 7 basic quality tools, free online
Ishikawa's seven quality tools, ready to use: paste your data from Excel, let the tool do the calculations, and export clean charts to PDF, PNG or Excel.
- 100% free
- No sign-up
- Paste from Excel
- Export to PDF, PNG & Excel
Check Sheet
Tally defects or events by type and time on a digital check sheet, then send totals to a Pareto chart.
Open tool → Free toolPareto Chart
Rank problems by count or cost and find the vital few with an 80/20 cumulative line.
Open tool → Free toolHistogram
See the shape of your data against spec limits, with mean, standard deviation and Pp/Ppk.
Open tool → Free toolScatter Diagram
Test whether two variables are related with a trend line, correlation (r) and R².
Open tool → Free toolControl Chart
Build I-MR, X̄-R, X̄-S, p, c and u charts with control limits and Nelson rule signals.
Open tool → Free toolStratification
Split data by machine, shift, supplier or operator to see where the problem really is.
Open tool → Free toolFishbone Diagram (Ishikawa)
Brainstorm and organize possible causes by category on a live Ishikawa diagram.
Open tool →Which basic quality tool should you use?
| Tool | Use it when… | What you get |
|---|---|---|
| Check Sheet | You need to collect data on what happens, when and where | Tally counts by category and period |
| Pareto Chart | You need to decide which problem to tackle first | Ranked categories and the vital few |
| Fishbone Diagram | You need to brainstorm the possible causes of a problem | Potential causes organized by category |
| Stratification | You suspect a machine, shift or supplier is different | Comparison of groups and the stand-out combination |
| Scatter Diagram | You want to test whether one variable affects another | Correlation, R² and trend line |
| Histogram | You need to see the spread of a process against its specification | Distribution, Pp/Ppk and out-of-spec % |
| Control Chart | You need to know whether a process is stable over time | Control limits and out-of-control signals |
Using the 7 quality tools together
- Collect. Record what happens, where and when with a check sheet.
- Prioritize. Rank the problems with a Pareto chart and pick the vital few.
- Find causes. Brainstorm with a fishbone diagram, then test them with stratification and scatter diagrams.
- Understand variation. Check the spread against the specification with a histogram.
- Hold the gains. Monitor the improved process with a control chart.
From paper records to connected quality data
The seven tools are only as good as the data behind them. Cloudtheapp captures inspections and quality issues at the source with digital forms, shows them on live dashboards that drill down to every record, and escalates problems to nonconformances and CAPA in the same validated system.
Frequently asked questions
What are the 7 basic quality tools?
The seven basic quality tools, popularized by Kaoru Ishikawa, are the check sheet, Pareto chart, histogram, scatter diagram, control chart, stratification and the cause-and-effect (fishbone) diagram. Together they cover collecting data, finding the biggest problems, understanding variation and identifying causes.
Who created the 7 quality tools?
Kaoru Ishikawa, a Japanese quality pioneer, promoted the set in the 1960s and argued that most quality problems can be solved with these seven simple tools. Several of them have older roots, such as Shewhart's control chart (1920s) and Juran's application of the Pareto principle.
In what order should I use them?
A typical flow is: collect data with a check sheet, rank problems with a Pareto chart, brainstorm causes with a fishbone diagram, test causes with stratification and scatter diagrams, understand the spread with a histogram, and monitor stability with a control chart.
Do I need statistical software?
No. These tools were designed to be used by everyone on the shop floor. The free tools on this page do the calculations for you: cumulative percentages, bins, correlation, control limits and rule checks.
Are these tools really free?
Yes. Every tool is free, needs no account and keeps your data in your browser. Paste data from Excel and export results to PDF, PNG, Excel or CSV.
From paper records to connected quality data
Cloudtheapp captures inspections and quality issues at the source with digital forms, shows them on live dashboards with drill-down to every record, and escalates problems to nonconformances and CAPA, in one validated cloud QMS.