Tolerance Checker Construction tools
In-browser processing
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Tolerance Checker

Evaluate measurements against your criteria and generate a reason for every result.

Supports manual entry and CSV paste, with downloadable CSV results.

Always-visible lower and upper limits
Column-fixed mm/m units to prevent mistakes
Batch CSV evaluation with reason output

Set Criteria

Choose the input mode and base unit, enter the criteria, and confirm the resulting lower and upper limits.

Enter Measurements (Manual / CSV)

Enter measurement points manually, or map CSV columns for a batch evaluation.

Review Results (OK/NG + Reason)

Review totals, the OK/NG summary, reasons, and failed points. Export the results as CSV or TSV.

How to use

  1. Choose target ± tolerance or upper/lower mode, then select the base unit.
  2. Enter values manually or paste CSV, then set a unit for each measurement column when needed.
  3. Click "Evaluate" to review the results, then export CSV or TSV if needed.

FAQ

What is the difference between target+/-tol and upper/lower?

Target ± tolerance calculates the lower and upper limits from a center value and tolerance. Upper/lower uses the lower and upper values you enter directly.

Can I set different units for each measurement column?

Yes. Set mm or m for each measurement column; values are converted to the base unit before comparison.

What happens if there are blanks or text values?

That row is marked NG_PARSE_ERROR, and the affected points are listed in the reason.

Are boundary values treated as OK?

Yes, by default. You can switch to strict inequalities in Settings.

Can I use row-specific criteria in CSV?

Yes. Use Advanced options to map criteria columns. A single CSV cannot mix criteria modes.

Notes

  • This tool evaluates only against the criteria you enter; it does not infer standards automatically.
  • Use one fixed unit per column. Mixing units within a column or by row is not supported.
  • All data is processed in your browser and is never saved to a server.