Quality & Metrology worked example
Sampling Plan Size at 12% sampling rate: a worked example
What does the result look like when sampling rate reaches 12%? The full calculation is worked below with real intermediate numbers. Use it when planning inspection workload and you need to know how many samples a lot will require.
The inputs for this scenario
- Lot size: 2,000 parts (unchanged)
- Sampling rate: 12 % (raised for this scenario; the documented default is 10)
- Minimum sample size: 50 parts (unchanged)
Working through the calculation
- Applying the documented formula (Calculated sample = lot size × sampling rate) to the inputs above produces each figure below.
- At this operating point the engine returns 240 samples for required sample size, the number this scenario is built around.
- At this operating point the engine returns 240 samples for calculated sample.
- At this operating point the engine returns 50 samples for minimum sample size.
How this compares with the baseline
- Against the tool's baseline example, where sampling rate sits at 10% and the headline result is 200 samples, this scenario comes in 20% above the baseline at 240 samples.
- A figure at this level is achievable when sampling rate is genuinely sustained, not just peaked for a shift. A flat percentage rule is not statistically equivalent to a standard AQL plan; for contractual acceptance sampling, derive sample size and accept/reject numbers from ANSI/ASQ Z1.4 or similar.
Results at a glance
- Required sample size: 240 samples (headline result)
- Calculated sample: 240 samples
- Minimum sample size: 50 samples
Run it with your numbers
- Every input above is editable in the live Sampling Plan Size calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.