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PROBATUS

Calibration certificate generator

Fill in the lab, customer, instrument and reference standard. The certificate builds as you type, with the results table, uncertainty and traceability statement in place, ready to save as a PDF.

Free, no login. What you enter stays in this browser.

New here? Load the example to see a finished job, then replace it with your own.

Laboratory

The organisation issuing the certificate.

Customer

Instrument calibrated

Calibration

Only if agreed with the customer.

Reference standard

The standard the readings were compared with.

Tolerance and uncertainty

±x% of (range max − range min)

Pass when the error is within tolerance. Uncertainty is reported only.

95 % coverage, k = 2. Check the ratio

Readings

The same readings as the as-found / as-left sheet. Change them in either place.

NominalAs foundAs found errorAs leftAs left errorResultRemove
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No result yet

Enter a tolerance, then a nominal value and at least an as-found reading for each point.

Sign-off

Certificate preview

This is what prints. Sign on the lines after printing.

Still empty

laboratory name, certificate number, customer, date of calibration, date of issue, reference standard, readings, measurement uncertainty. You can print without them, but a complete certificate has all of these.

Your laboratory name

Calibration certificate

Certificate no. —

Customer

Name
—
Address
—

Instrument calibrated

Tag or ID
—
Description
—
Manufacturer
—
Model
—
Serial number
—
Range
—

Calibration

Date of calibration
—
Date of issue
—
Location
—
Method
—
Conditions
—

Reference standard

Description
—
ID
—
Certificate no.
—
Calibration due
—

Results

No readings entered.

Tolerance
—
Decision rule
Simple acceptance (w = 0)
Uncertainty
—
Overall result
—

Measurements were made by comparison with the reference standard identified above. Its calibration certificate is the basis for the metrological traceability of these results.

The results relate only to the item calibrated, as received and as left on the date of calibration. This certificate shall not be reproduced except in full without the approval of the issuing laboratory.

Calibrated by

Authorised by

Prepared with the free Probatus calibration tools

End of certificate

This tool lays out what you enter. It does not check your traceability or uncertainty, and it does not make a certificate accredited.

Next: Certificate checklist

Check this certificate against ISO/IEC 17025 clause 7.8. The checklist fills in from what you entered here.

Continue

What goes on a calibration certificate

A certificate has to let someone who was not there understand what was calibrated, how, against what, and with what result. ISO/IEC 17025 sets out the contents in clauses 7.8.2 and 7.8.4. This template covers them in order:

  • Who and what: your laboratory, the customer, and the instrument with its tag, make, model, serial number and range.
  • When and where: the date of calibration, the date the certificate was issued and where the work was done. Assessors often find certificates with only one of the two dates.
  • How: the method or procedure and the environmental conditions that affect the result.
  • Against what: the reference standard, its identification and its own certificate number, which is what makes the result traceable.
  • Results: every test point with its unit, as found and as left when an adjustment was made, and the measurement uncertainty.
  • Sign-off: who did the calibration and who authorised the certificate.

Certificate template or certificate software?

A Word or Excel template leaves the arithmetic and the consistency to you: the error column, the pass or fail, the tolerance at each point and the uncertainty statement all have to be typed and checked by hand. This generator calculates them from your readings, so the table and the overall result always agree. It is the right size for an occasional certificate.

Once certificates are a daily job, the gaps are numbering, signatures, approval, the reference standard's due date and finding last year's record at an audit. That is what calibration management software is for.

Statements of conformity

If the certificate says pass or fail, it should also say how that was decided. The decision rule and the tolerance are printed under the results table. If you have worked out a test uncertainty ratio, it is printed there too.

Questions

What should a calibration certificate include?
ISO/IEC 17025 clauses 7.8.2 and 7.8.4 list the contents: a title, the laboratory name and address, where the calibration was done, a unique identifier on every page, the customer, the method, a description of the item, the calibration date and the issue date, the results with their units, the measurement uncertainty, the environmental conditions, a statement of metrological traceability, results before and after any adjustment, and who authorised the certificate.
Does this make my certificate ISO/IEC 17025 accredited?
No. Accreditation belongs to a laboratory, for the measurements in its scope, and is granted by an accreditation body. Only an accredited laboratory can issue a certificate carrying that body's symbol. This generator lays out the fields the standard asks for. It does not check your traceability or your uncertainty figures.
Can I put a calibration due date on the certificate?
Only when your customer has agreed to it. ISO/IEC 17025 clause 7.8.4 says a certificate or label shall not recommend a calibration interval unless that has been agreed with the customer. The due date field is optional and is left off the certificate when empty.
How do I save the certificate as a PDF?
Press "Print or save as PDF" and choose "Save as PDF" as the destination in the print dialog. On a phone, use the share or print option and pick "Save to Files" or "Save as PDF". The page header and the form are left out, so only the certificate is saved.

Other free calibration tools

Doing this for every instrument, every month?

Probatus produces this certificate from the readings a technician enters on site, with their signature, a supervisor's approval, your logo and a customer portal to download it from.

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