Quality & Metrology worked example
Rejection Rate at 1.15% target rejection rate: a worked example
What does the result look like when target rejection rate reaches 1.15%? The full calculation is worked below with real intermediate numbers. Use it to track reject levels on a quality board and to trigger containment or corrective action when the target is missed.
The inputs for this scenario
- Rejected parts: 15 parts (unchanged)
- Parts inspected: 750 parts (unchanged)
- Target rejection rate: 1.15 % (raised for this scenario; the documented default is 1)
Working through the calculation
- Applying the documented formula (Rejection rate = rejected parts ÷ parts inspected × 100) to the inputs above produces each figure below.
- At this operating point the engine returns 2 % rejected for rejection rate, the number this scenario is built around.
- At this operating point the engine returns -0.85 points for gap to target rejection rate.
- At this operating point the engine returns 15 count for rejected parts.
- At this operating point the engine returns 750 count for parts inspected.
How this compares with the baseline
- Against the tool's baseline example, where target rejection rate sits at 1% and the headline result is 2 % rejected, this scenario lands almost exactly on the baseline at 2 % rejected.
- A figure at this level is achievable when target rejection rate is genuinely sustained, not just peaked for a shift. It only reflects the sample actually inspected — if inspection coverage is partial or the sample is not random, the rate understates or misrepresents true defective rate in the population.
Results at a glance
- Rejection rate: 2 % rejected (headline result)
- Gap to target rejection rate: -0.85 points
- Rejected parts: 15 count
- Parts inspected: 750 count
Run it with your numbers
- Every input above is editable in the live Rejection Rate calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.