Calibration Interval Recommender
Select your equipment type, usage pattern, and criticality to get a recommended calibration interval based on ISO 9001 best practices.
How calibration intervals are determined
ISO 9001:2015 Clause 7.1.5 requires calibration at "specified intervals" but does not mandate specific frequencies. Your intervals should reflect equipment type, usage frequency, environmental conditions, and historical stability. ISO 9001:2026 was published on 16 September 2026, and organisations certified to ISO 9001:2015 have until 30 September 2029 to transition (ISO/TC 176 transition guidance); clause references here use the 2015 numbering that existing certificates were granted against.
This tool uses typical interval ranges from UK manufacturing practice, adjusted for your usage pattern and criticality level. The output is a starting recommendation — your quality system should document the actual interval chosen and its justification.
For more detail on interval determination, see our guide: How Often Should Test Equipment Be Calibrated?
Once you have an interval, record it in a schedule template so due dates are tracked alongside your equipment register.