Calibration Certificate Template: Free Download + Management Guide

A calibration certificate documents the results of a calibration — the measured values, reference values, uncertainties, and whether the instrument meets its specifications. For UK quality managers, these certificates are the evidence trail that auditors check at every surveillance visit.

This guide includes what every calibration certificate must contain (per ISO/IEC 17025:2017) and explains how to manage certificates effectively when you're tracking 20–500 instruments.

What a Compliant Calibration Certificate Must Include

Whether you're issuing certificates for in-house calibrations or receiving them from external providers, the certificate must include these elements to meet ISO 17025 requirements:

Identification

• Unique certificate number
• Name and address of the calibration laboratory
• Laboratory accreditation number (if UKAS-accredited)
• Name and address of the customer

Equipment Details

• Description of the instrument calibrated
• Manufacturer, model, and serial number
• Condition of the instrument on receipt (any damage, contamination, or observations)

Calibration Details

• Date of calibration
• Calibration method or procedure reference
• Identification of the reference standards used (with their own traceability)
• Environmental conditions during calibration (temperature, humidity — where significant)

Results

• Measured values and reference values
• Measurement uncertainty for each result
• Statement of conformity with specified tolerances (pass/fail), where applicable
• Any observations or notes

Authorisation

• Name and signature (or equivalent authorisation) of the person responsible
• Statement prohibiting partial reproduction without laboratory approval

For certificates from UKAS-accredited laboratories, the UKAS logo and accreditation number must also appear, along with a reference to ISO/IEC 17025.

Issuing In-House Calibration Certificates

If you perform calibrations in-house (not using an external UKAS-accredited laboratory), you need:

• A documented calibration procedure for each equipment type
• Reference standards with valid, traceable calibration certificates
• Trained personnel performing the calibration
• Environmental conditions recorded (where significant)
• Certificates issued with all the fields listed above

In-house certificates do not carry UKAS accreditation marks, but they can demonstrate measurement traceability if your reference standards are calibrated by a UKAS-accredited laboratory.

Managing Certificates: The Scale Problem

For 10–20 instruments, managing certificates in a folder structure works. Beyond 50 instruments, the system breaks:

• Finding a specific certificate: "Where's the certificate for pressure gauge PG-087 from last September?" becomes a 5-minute search
• Linking to equipment records: Cross-referencing certificates with your equipment register is manual and error-prone
• Audit trail: Who accessed which certificate, when? A shared drive doesn't track this
• Completeness check: Are any instruments missing their most recent certificate? You have to check each one manually
• Historical chain: Auditors may ask for multiple years of calibration history for a single instrument. Finding all certificates in sequence requires manual assembly

CalProof links every certificate directly to its equipment record. Upload a PDF, tag it to the instrument, and the audit trail is automatic. When an auditor asks for instrument #247's full calibration history, you pull it up in seconds. From £29/mo for UK quality managers.

Sources

• ISO/IEC 17025:2017 — General requirements for the competence of testing and calibration laboratories
• UKAS — United Kingdom Accreditation Service

This guide covers general requirements for calibration certificates. Specific requirements may vary by sector, accreditation body, and customer specifications. This is not legal or compliance advice.