Understanding Unit Rework Rate
How we calculate. Rework % = units sent to rework ÷ total units × 100. The form uses the same arithmetic as the worked examples on this page. See our methodology and accuracy policy.
Real-world scenario: A typical Unit Rework Rate case uses rework units 40 and total units 1000. Enter the same figures below to reproduce the worked path.
What is Unit Rework Rate?
A quality-cost KPI distinct from scrap (scrapped forever) and FPY (first-pass success). Rework consumes capacity even when units eventually pass.
- Rework = returned for correction
- Same UOM as total
- Pairs with FPY and scrap
The Formula
Worked Example
Common Use Cases
- Cost of poor quality: rework load
- Cell design: rework loops
- Supplier quality: incoming rework
Pro Tips
- Don’t double-count multi-loop rework unless intentional
- Separate cosmetic vs functional
- Watch hidden offline rework
Limitations: Unit Rework Rate results are educational manufacturing and lean/TPM planning aids—not process-safety, quality-system, or financial advice. Confirm definitions with your MES/SCADA and quality policies.
FAQ
Rework vs scrap?
Scrap is discarded; rework is corrected and may still ship. Track both—FPY fails on first defect either way.
What if total units is 0?
Rework rate is undefined—enter a positive total.
Authoritative References
For OEE and manufacturing KPI definitions, consult: