Measurement, Test & Control Equipment worked example

Calibration Interval Workload at 17% out-of-tolerance and rework allowance: a worked example

What does the result look like when out-of-tolerance and rework allowance reaches 17%? The full calculation is worked below with real intermediate numbers. Use when planning calibration technician headcount, scheduling monthly or quarterly calibration workload, or deciding whether to outsource calibration services.

The inputs for this scenario

  • Instruments due for calibration this cycle: 85 instruments (unchanged)
  • Average calibration time per instrument: 45 min / instrument (unchanged)
  • Out-of-tolerance and rework allowance: 17 % (raised for this scenario; the documented default is 15)

Working through the calculation

  • Applying the documented formula (Base calibration time = instruments due x average calibration time per instrument) to the inputs above produces each figure below.
  • At this operating point the engine returns 2.21 hr for total calibration workload (hours), the number this scenario is built around.
  • At this operating point the engine returns 1.89 hr for base calibration time (hours).
  • At this operating point the engine returns 17 % for out-of-tolerance allowance (hours).
  • At this operating point the engine returns 45 pieces / min for calibration rate (instruments/min).

How this compares with the baseline

  • Against the tool's baseline example, where out-of-tolerance and rework allowance sits at 15% and the headline result is 2.17 hr, this scenario comes in 1.74% above the baseline at 2.21 hr.
  • A figure at this level is achievable when out-of-tolerance and rework allowance is genuinely sustained, not just peaked for a shift. It uses one average time per instrument, so a mixed queue of quick handheld gauges and slow multifunction calibrators will hide real per-class variation that affects scheduling.

Results at a glance

  • Total calibration workload (hours): 2.21 hr (headline result)
  • Base calibration time (hours): 1.89 hr
  • Out-of-tolerance allowance (hours): 17 %
  • Calibration rate (instruments/min): 45 pieces / min

Run it with your numbers

  • Every input above is editable in the live Calibration Interval Workload calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.