Post-Shipment Defect Escape Rate Calculator
Track downstream defects using a consistent shipment cohort and inspection window.
How to use this calculator
- Enter downstream defects and total units shipped in the same scope.
- Check that every input uses the stated units and covers the same period, population or project scope.
- Change one assumption at a time when comparing scenarios.
Formula used by quality escape rate calculator
Escape rate = post-shipment defects ÷ shipped units
- Escape rate = post-shipment defects ÷ shipped units
- This is a unit-based rate, not a defect-opportunity rate. Ensure defect and shipment counts cover the same product and period.
- Inputs are validated against the tool-specific constraints; displayed results are rounded for readability.
Worked examples
Worked example
Seven defects discovered after shipment across 25,000 shipped units is 280 defects per million units.
The calculator reports post-shipment defects per million units and the percentage rate.
The calculator reports post-shipment defects per million units and the percentage rate.
Understanding the result
Track downstream defects using a consistent shipment cohort and inspection window.
This is a unit-based rate, not a defect-opportunity rate. Ensure defect and shipment counts cover the same product and period.
Important notes
This is a unit-based rate, not a defect-opportunity rate. Ensure defect and shipment counts cover the same product and period.
Treat the result as an estimate for the assumptions entered; verify important specifications against the relevant source or professional guidance.
Frequently asked questions
Does this include defects found internally before shipping?
No. It is specifically for defects discovered after shipment.
Can I compare products directly?
Only with consistent defect definitions, exposure periods, shipment counts and detection processes.
How should I use this result?
Enter downstream defects and total units shipped in the same scope.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.