Reliability and uptime
Quality rate calculator
Quality is the share of units produced that met specification first time. Rework counts against it. A unit that needed a second pass consumed capacity twice, even though it eventually shipped.
Quality = Good units ÷ Total units produced × 100
Units that met specification without rework
Show the assumptions
- Formula
- Quality = Good units ÷ Total units produced × 100
Count reworked units as defects here. Counting them as good is the usual reason a plant reports 99% quality while the scrap account says otherwise.
Quality rate
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Prefilled with an example. Change any number and the result updates.
How to calculate Quality rate
Quality = Good units ÷ Total units produced × 100
Worked example
- Good units 14,925 units
- Total units produced 15,000 units
Quality rate = 99.50%
Reading the result
Count reworked units as defects here. Counting them as good is the usual reason a plant reports 99% quality while the scrap account says otherwise.
Benchmarks
99.9% is the quality figure commonly cited as world class within the OEE framework.
Quality rate questions
Does rework count as a defect?
Yes, in the OEE definition. The unit failed on the first pass and consumed capacity twice, so counting it as good hides a real loss. Track rework and scrap separately if you need to tell the two apart.
Is quality rate the same as first pass yield?
For a single operation, effectively yes. They diverge across a multi-step process, where first pass yield is usually rolled up by multiplying the yield of every step. That produces a much lower and more honest number than measuring the final step alone.
Related calculators
Log defects against the asset
UpKeep records the work, the hours and the failures this metric depends on, so Quality rate is a report rather than a spreadsheet exercise.