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Quality Rate Calculator

Work out quality rate instantly with clear inputs, formula shown and shareable results.

About Quality Rate Calculator

Quality rate for OEE counts units that were finally saleable, so reworked units pass. First pass yield counts only units right the first time and is the harsher, more useful improvement measure. The gap between them is exactly the rework burden hidden by conventional quality reporting.

Formulas

Quality rate

Quality rate % = (total - scrap) x 100 / total

First pass yield

FPY % = (total - scrap - rework) x 100 / total

Worked example

With the default values below, Quality Rate Calculator returns Quality Rate of 98.414%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total Units Producedminimum 0.01
5,800
Units Scrappedminimum 0
92
Units Reworkedminimum 0
145
Cost Per Rejected Unitminimum 0
140

Results

Quality Rate
98.414%
First Pass Yield
95.914%
Scrap Cost
$12,880.00
Defect Rate
40,862

Step by step

  1. 1Values used
  2. 2Quality rate
  3. 3First pass yield
  4. 4Quality Rate= 98.414
  5. 5First Pass Yield= 95.914
  6. 6Scrap Cost= 12,880.00
  7. 7Defect Rate= 40,862

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does OEE let rework count as good?

OEE quality rate is about saleable output. That is why FPY should be tracked alongside it — rework consumes capacity and labour that OEE quality rate does not penalise.

What does PPM mean here?

Defective parts per million, the standard automotive supply metric. 1000 ppm is 0.1%; competitive suppliers target under 50 ppm.

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