Skip to content
Calculate.FAST

Yield, FPY & scrap calculator

Reconcile every input unit, then separate what passed first time from what became good only after rework—and what was scrapped.

Yield from reconciled unit counts

All units entering this one process in the observation period.

Units accepted without rework, rerun, repair or retest.

Units accepted only after the rework process you define.

Units assigned to scrap rather than accepted output.

First Pass Yield (FPY)
90.0%
900 units
Final yield
97.0%
970 units
Rework rate
7.0% · 70
Scrap rate
3.0% · 30
First-pass loss
100

Disposition of every input unit

  • Passed first time: 900
  • Good after rework: 70
  • Scrapped units: 30

Passed first time + good after rework + scrap = input units.

These rates describe unit disposition under your acceptance and rework definitions. They do not count defects or judge process performance.

Included

  • First Pass Yield for units accepted without rework
  • Final yield including units recovered through rework
  • Rework and scrap counts and rates
  • Exact reconciliation of all input units into three outcomes

Not included

  • Defects per unit, defect opportunities or DPMO
  • Rolled Throughput Yield across multiple process steps
  • Rework or scrap cost estimates
  • Quality targets, root-cause analysis or compliance decisions

What this means

First Pass Yield (FPY) is the share of input units accepted on their first pass, without rework, rerun, repair or retest. It exposes work that final yield alone can hide.

Final yield adds units that became acceptable after rework. In this exact three-outcome model, the difference between final yield and FPY is the rework rate.

Every input unit must be assigned once: passed first time, good after rework or scrapped. The calculator withholds all rates when those counts do not reconcile, rather than inventing an unaccounted category.

Formula & worked example

First Pass Yield = passed first time ÷ input units
final good = passed first time + good after rework
final yield = final good ÷ input units
rework rate = good after rework ÷ input units
scrap rate = scrapped units ÷ input units

1,000 input units: 900 passed first time, 70 good after rework and 30 scrapped

First Pass Yield: 900 ÷ 1,000
90.0%
Final yield: (900 + 70) ÷ 1,000
97.0%
Rework and scrap rates
7.0% and 3.0%

All 1,000 units reconcile: 970 are finally good, but only 900 passed without rework.

How this calculation works

The calculation follows the formulas, definitions and assumptions explained on this page. The references below support the method and any stated boundaries.

Official sources

Common questions

Why show FPY and final yield separately?
Final yield can look strong even when substantial rework was needed. FPY shows the share accepted first time; final yield shows the share accepted after the entered rework outcome is included.
What counts as good after rework?
Use units that initially failed your acceptance criteria but became acceptable after the rework, repair, rerun or retest process your operation defines.
Is scrap rate the same as defect rate?
No. Scrap rate is a share of units assigned to the scrap outcome. A unit may contain several defects, and a defective unit may instead be reworked.
Why must all counts add up exactly?
Exact reconciliation prevents missing, duplicated or differently scoped units from producing misleading rates. Use the same process boundary and observation period for every count.

Related calculators

OEE calculatorProcess capability (Cp & Cpk)Takt & cycle time