ISO 17025 Uncertainty CalculatorGUM-compliant Excel workbook · One-time purchase

For ISO/IEC 17025 calibration and testing laboratories

ISO 17025 Uncertainty Calculator: Pass Audits Instantly

Guarantee ISO 17025 Clause 7.6 compliance with an automated, GUM-compliant measurement uncertainty calculator.

View pricingSee the workbook ↓

  • Excel .xlsx, runs offline
  • JCGM 100:2008 (GUM) method
  • 110% money-back audit guarantee
Calibration bench in a metrology laboratory: gloved hands measuring a steel gauge block with a digital caliper, a gauge block set and a laptop with a spreadsheet in the background
ISO/IEC 17025:2017Built around Clause 7.6
JCGM 100:2008 (GUM)Type A and Type B budgets
Microsoft Excel .xlsxRuns offline, no plugins, no account
One-time purchaseInstant download, no subscription
Preview of the Budget sheet: uncertainty sources with type, value, unit, distribution, divisor, standard uncertainty, sensitivity coefficient and contribution, then combined standard uncertainty, effective degrees of freedom, coverage factor and expanded uncertainty

Swipe sideways to read the full sheet →

Illustrative preview with example data (25 mm gauge block measured with a digital caliper). Final sheet layout may differ.

Inside the workbook

Every step your assessor will ask about, on one sheet

  1. Open input cells. Value, unit, distribution and sensitivity coefficient stay editable and show in blue.
  2. Locked calculations. Divisors, standard uncertainties u(xi) and contributions are computed in protected cells, formulas visible.
  3. Combined and expanded uncertainty. Root-sum-square uc(y), effective degrees of freedom (Welch-Satterthwaite), coverage factor k from the Student t-table, then U = k · uc(y).

What you get

One workbook, built around Clause 7.6

One Excel workbook (.xlsx)

Built around ISO/IEC 17025:2017 Clause 7.6.

GUM-compliant propagation

JCGM 100:2008 method, Type A and Type B budgets.

Sample-size corrections

Automatic corrections and Student's t-value tables.

Controlled sheet

Locked calculation cells with open input cells, so your auditor sees a controlled sheet.

Runs offline in Microsoft Excel

No subscription, no account, no plugins.

Expanded uncertainty U equals k times uc(y) with k equals 2, shown as a 95.45 percent band on a normal distribution above a millimetre scale

Who it is for

Quality managers and metrologists who sign the uncertainty budget

Laboratory quality managers and metrologists preparing an initial accreditation, a surveillance audit, or closing a finding on measurement uncertainty.

  • Initial accreditation
  • Surveillance audit
  • Closing a finding
Seal: 110 percent money-back guarantee, ISO 17025 audit, Clause 7.6

Our guarantee

110% of your money back if an audit faults measurement uncertainty

If your laboratory receives a non-conformance for measurement uncertainty on your next ISO 17025 audit while using this tool, we refund 110% of your money. You keep the file.

Common questions

Which Excel versions?
Files are standard .xlsx. Built and tested for desktop Microsoft Excel. Not designed for Google Sheets.
How is it delivered?
Instant download link by email after checkout.
How do I claim the guarantee?
Send the audit finding that names measurement uncertainty. We refund 110%, and you keep the file.
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