Understanding Scrap Rate
How we calculate. Scrap % = scrap count ÷ total count × 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 Scrap Rate case uses scrap units 8 and total units 800. Enter the same figures below to reproduce the worked path.
What is Scrap Rate?
A quality-cost KPI. Lower is better. Material scrap weight variants use the same structure with weight UOMs.
- Same UOM for scrap and total
- Define scrap vs rework
- Lower is better
The Formula
Worked Example
Common Use Cases
- Cost of poor quality: scrap trends
- Process capability: waste hotspots
- Material planning: yield loss
Pro Tips
- Separate startup scrap
- Track root causes
- Pair with yield rate
Limitations: Scrap 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
Units or weight?
Either—keep both inputs on the same basis and label the report.
What if total units is 0?
Scrap rate is undefined—enter a positive total.
Authoritative References
For OEE and manufacturing KPI definitions, consult: